{"title":"Boilers \u0026 Heating","description":"\u003cdiv style=\"font-family: Arial, sans-serif; font-size: 15px; color: #333333; line-height: 1.6;\"\u003e\n  \u003cp\u003e\n    As an undisputed leader in high-efficiency thermal engineering, \u003cstrong\u003eLochinvar®\u003c\/strong\u003e delivers industry-defining condensing boilers, commercial water heaters, and integrated hydronic systems. Renowned for pioneering low-NOx burner systems and rugged fire-tube designs, Lochinvar components deliver exceptional thermal efficiency and pinpoint temperature control to mechanical rooms worldwide.\n  \u003c\/p\u003e\n  \n  \u003cp style=\"margin-top: 15px; font-weight: bold;\"\u003eBrowse our submittal-ready inventory of genuine Lochinvar equipment:\u003c\/p\u003e\n  \n  \u003cul style=\"margin-top: 5px; padding-left: 20px;\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCommercial Condensing Boilers:\u003c\/strong\u003e Featuring advanced single-pass wave fire-tube heat exchangers built to achieve up to 96.2% thermal efficiency while maintaining low waterside pressure drops.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePrecision Modulation \u0026amp; Control:\u003c\/strong\u003e Equipped with ultra-wide turndown burner systems and smart touchscreen remote diagnostics to seamlessly adjust heating output for facility demands.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIndustrial-Grade Plant Design:\u003c\/strong\u003e Engineered to integrate flawlessly into complex primary or variable full-flow configurations without requiring extensive piping networks.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e","products":[{"product_id":"lochinvar-crest-slimshield-1-0-million-btu-commercial-condensing-boiler","title":"Lochinvar Crest SlimShield 1.0 - Crest SlimShield Commercial Condensing Boiler, 1.0 Million BTU, FBN1001","description":"\u003cp\u003eThe Lochinvar Crest SlimShield is a high-capacity, 1.0 Million BTU commercial condensing boiler engineered for exceptional thermal efficiency and maximum output within an ultra-narrow footprint. Featuring advanced modulating burner technology and a robust stainless steel fire-tube heat exchanger, the Crest SlimShield series delivers an outstanding \u003cb\u003e96.2%\u003c\/b\u003e thermal efficiency rating, making it the premier choice for large-scale institutional retrofits, district heating, and demanding commercial new construction projects.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eKey Performance Features:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cb\u003ePatented Wave Fire-Tube Heat Exchanger:\u003c\/b\u003e Built with a premium, corrosion-resistant stainless steel heat exchanger that optimizes heat transfer while providing superior resistance to thermal stress and varying flow rates.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eSlimShield Space-Saving Profile:\u003c\/b\u003e The advanced vertical cabinet design allows this 1.0M BTU powerhouse to easily roll through standard 36-inch commercial doorways, drastically simplifying rigging and mechanical room installations.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eSmartTouch Control Integration:\u003c\/b\u003e Equipped with a built-in touchscreen control system that offers outdoor reset functionality, cascading controls for up to 8 boilers, and seamless BMS communication protocols.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003e20:1 Turndown Modulating Burner:\u003c\/b\u003e Precisely matches building heat loads down to 5% of maximum output, eliminating short-cycling and radically reducing seasonal fuel consumption.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cb\u003eApplication \u0026amp; Engineering Compliance:\u003c\/b\u003e The Crest SlimShield supports versatile venting options using PVC, CPVC, Polypropylene, or Stainless Steel. It is ASME certified, CSA design certified, and meets the most stringent Low-NOx emission standards required for modern green building compliance.\u003c\/p\u003e","brand":"Lochinvar","offers":[{"title":"Default Title","offer_id":42829283328094,"sku":null,"price":51154.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/Lochinvar-Crest-FBN1001-Commercial-Boiler.jpg?v=1780919632"},{"product_id":"wm-lgb-5","title":"Weil-McLain LGB-5 - LGB-5 Cast Iron Gas Boiler","description":"\u003cdiv style=\"font-family: Arial, sans-serif; font-size: 15px; color: #333333; line-height: 1.6;\"\u003e\n  \u003cp\u003e\n    The \u003cstrong\u003eWeil-McLain® LGB Series 5\u003c\/strong\u003e is a high-capacity, atmospheric-vented cast iron sectional gas boiler engineered to deliver rugged, dependable low-pressure hot water or steam heating across light-to-medium commercial architectures. Formed from high-grade, precision-cast iron sections that retain their tough natural outer skin, the LGB-5 offers superior structural resistance against scaling and fireside corrosion while acting as a massive thermal reservoir for demanding building distribution loops.\n  \u003c\/p\u003e\n  \u003cp style=\"margin-top: 15px;\"\u003e\n    By featuring high-performance aluminized steel burners and a compact mechanical design, this series facilitates straightforward installation in space-constrained mechanical rooms, allowing individual sections to navigate easily through standard doorways for on-site knockdown assembly. Watertight port seals are achieved using modern flexible elastomer sealing rings that cleanly accommodate structural expansion and contraction cycles, working alongside straightforward mechanical controls to ensure continuous operational uptime without the vulnerabilities of intricate microcircuit components.\n  \u003c\/p\u003e\n\u003c\/div\u003e","brand":"Weil-McLain","offers":[{"title":"Default Title","offer_id":42839826104414,"sku":"WM-LGB-5","price":14358.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/weil-mclain-lgb-series-commercial-gas-boiler.png?v=1781146641"},{"product_id":"wm-lgb-6","title":"Weil-McLain LGB-6 - LGB-6 Cast Iron Gas Boiler","description":"\u003cdiv style=\"font-family: Arial, sans-serif; font-size: 15px; color: #333333; line-height: 1.6;\"\u003e\n  \u003cp\u003e\n    The \u003cstrong\u003eWeil-McLain® LGB Series 6\u003c\/strong\u003e is a commercial-grade, atmospheric-vented cast iron sectional gas boiler engineered to supply dependable, low-pressure hot water or steam heating across light-to-medium commercial facility plants. Built with premium, precision-cast iron sections and durable sealing rings, the LGB-6 provides long-term corrosion resistance, excellent structural thermal retention, and a classic robust footprint that easily absorbs the stress of large hydronic distribution loops.\n  \u003c\/p\u003e\n  \u003cp style=\"margin-top: 15px;\"\u003e\n    Featuring high-efficiency aluminized steel burners and a clean, low-profile layout, this boiler is designed for space-constrained mechanical rooms, allowing individual sections to be maneuvered through standard commercial door frames for simple on-site block assembly. Its high-grade cast iron construction acts as a highly reliable heat reservoir, delivering quiet thermal distribution, low stack temperatures, and straightforward mechanical controls that remove the vulnerabilities of complex modern electronic diagnostic arrays.\n  \u003c\/p\u003e\n\u003c\/div\u003e","brand":"Weil-McLain","offers":[{"title":"Default Title","offer_id":42839826137182,"sku":"WM-LGB-6","price":16619.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/weil-mclain-lgb-series-commercial-gas-boiler.png?v=1781146641"},{"product_id":"lv-crest-fb0750","title":"Lochinvar Crest 750000 - Crest Condensing Boiler, 750,000 BTU","description":"\u003cdiv style=\"font-family: Arial, sans-serif; font-size: 15px; color: #333333; line-height: 1.6;\"\u003e\n  \u003cp\u003e\n    The \u003cstrong\u003eLochinvar Crest® FBN0751\u003c\/strong\u003e is a commercial floor-mount condensing gas boiler delivering a precise input of 750,000 BTU\/hr and a thermal efficiency rating of up to 96.2%. Engineered to revolutionize modern hydronic heating plant design, the Crest series utilizes a highly advanced, single-pass Wave Fire-Tube heat exchanger construction. This design achieves exceptional heat transfer while keeping waterside pressure drops low, allowing easy integration into variable primary or full-flow configurations without complex primary\/secondary piping.\n  \u003c\/p\u003e\n  \u003cp style=\"margin-top: 15px;\"\u003e\n    Equipped with a top-mounted micro-metal fiber burner and a negative regulation combustion framework, the boiler delivers smooth, quiet operation with an ultra-wide 15:1 modulation turndown ratio. It runs reliably even under drops in local utility gas pressures down to 4 inches water column. System diagnostics are managed through Lochinvar's signature SMART TOUCH™ touchscreen dashboard featuring CON·X·US® remote connectivity, letting facility teams monitor operation or adjust parameters from a remote location.\n  \u003c\/p\u003e\n\u003c\/div\u003e","brand":"Lochinvar","offers":[{"title":"Default Title","offer_id":42839826399326,"sku":"LV-CRST-FB0750","price":14407.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/Lochinvar-Crest-FBN1001-Commercial-Boiler.jpg?v=1780919632"},{"product_id":"wm-ultra-series","title":"Weil-McLain Ultra Series High-Efficiency Gas Boiler","description":"\u003cdiv style=\"font-family: Arial, sans-serif; font-size: 15px; color: #333333; line-height: 1.6;\"\u003e\n  \u003cp\u003e\n    The \u003cstrong\u003eWeil-McLain Ultra Series High-Efficiency Gas Boiler\u003c\/strong\u003e is a high-performance boiler part engineered to deliver premium hydronic efficiency and reliability. Built with a heavy-duty cast aluminum housing, this unit provides exceptional durability and outstanding resistance to demanding system environments. Its low-maintenance, high-performance architecture makes it an ideal solution for residential, commercial, and industrial hydronic application loops.\n  \u003c\/p\u003e\n  \u003cp style=\"margin-top: 15px;\"\u003e\n    Engineered as the centerpiece of advanced low-temperature condensing hydronic systems, the Ultra Series leverages state-of-the-art modulating burner configurations to eliminate short-cycling and lower fuel utility rates by up to 30%. The integration of an UltraArmor protective thermal block structure defends core passageways from corrosion and debris accumulation, sustaining high operational efficiency year after year. Equipped with intuitive multi-zone digital controls and outdoor temperature monitoring interfaces, this condensing system smoothly matches heat production to ambient load demands for uniform climate control.\n  \u003c\/p\u003e\n\n  \u003c!-- Advanced Engineering Features Bullets --\u003e\n  \u003cdiv style=\"margin-top: 25px; margin-bottom: 20px;\"\u003e\n    \u003ch4 style=\"font-size: 16px; font-weight: bold; margin-bottom: 10px; color: #111111; border-bottom: 2px solid #111111; padding-bottom: 5px;\"\u003eAdvanced Engineering Features:\u003c\/h4\u003e\n    \u003cul style=\"margin: 0; padding-left: 20px; font-size: 14px; color: #333333; line-height: 1.6;\"\u003e\n      \u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong\u003eUltraArmor Nanotechnology Coating:\u003c\/strong\u003e Premium protective internal shielding acts as a barrier against scaling and harsh thermal cycling stresses to secure heat exchanger longevity.\u003c\/li\u003e\n      \u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong\u003e5:1 Proportional Modulation Turn-Down:\u003c\/strong\u003e Advanced gas valve and variable-speed blower automatically scale performance down to 20% capacity to accurately fulfill small zone demands without wasting energy.\u003c\/li\u003e\n      \u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong\u003eU-Control Intelligent Logic Board:\u003c\/strong\u003e Comprehensive multi-circulator management screen monitors internal sensors and outdoor profiles, operating up to three unique temperature setpoints simultaneously.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Weil-McLain","offers":[{"title":"Default Title","offer_id":43050609082462,"sku":"383-500-732","price":3667.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/Weil-McLain_Ultra_Series_high_efficiency_condensing_gas_water_boiler_with_a_fully_removable_grey_front_access_jacket_assembly..jpg?v=1782003884"},{"product_id":"lv-knight-series","title":"Lochinvar Knight High Efficiency Condensing Boiler","description":"\u003cdiv style=\"font-family: Arial, sans-serif; font-size: 15px; color: #333333; line-height: 1.6;\"\u003e\n  \u003cp\u003e\n    The \u003cstrong\u003eLochinvar Knight High Efficiency Condensing Boiler\u003c\/strong\u003e is a high-performance boiler part engineered to deliver premium hydronic efficiency and reliability. Built with a heavy-duty stainless steel housing, this unit provides exceptional durability and outstanding resistance to demanding system environments. Its low-maintenance, high-performance architecture makes it an ideal solution for residential, commercial, and industrial hydronic application loops.\n  \u003c\/p\u003e\n  \u003cp style=\"margin-top: 15px;\"\u003e\n    Setting the standard for modern hydronic engineering, this modulating condensing gas boiler utilizes a precision-engineered stainless steel fire-tube heat exchanger to achieve an exceptional 95% AFUE rating. The integrated SMART SYSTEM™ operating control features an advanced digital user interface with multi-boiler cascading capabilities, real-time data logging, and outdoor reset functions to dynamically maximize fuel efficiency based on ambient conditions. Equipped with a 10:1 turndown ratio to match low heat demands without short-cycling, this unit delivers whisper-quiet, top-tier heating performance for custom homes and complex commercial properties alike.\n  \u003c\/p\u003e\n\n  \u003c!-- Advanced Engineering Features Bullets --\u003e\n  \u003cdiv style=\"margin-top: 25px; margin-bottom: 20px;\"\u003e\n    \u003ch4 style=\"font-size: 16px; font-weight: bold; margin-bottom: 10px; color: #111111; border-bottom: 2px solid #111111; padding-bottom: 5px;\"\u003eAdvanced Engineering Features:\u003c\/h4\u003e\n    \u003cul style=\"margin: 0; padding-left: 20px; font-size: 14px; color: #333333; line-height: 1.6;\"\u003e\n      \u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong\u003ePremium Fire-Tube Heat Exchanger:\u003c\/strong\u003e High-grade stainless steel construction accelerates heat transfer while offering superior resistance to scale accumulation and chemical corrosion.\u003c\/li\u003e\n      \u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong\u003e10:1 Modulating Turndown Ratio:\u003c\/strong\u003e Automatically scales down burner firing rates to match exact structural heating demands, eliminating unnecessary fuel consumption.\u003c\/li\u003e\n      \u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong\u003eSMART SYSTEM™ Controls:\u003c\/strong\u003e Features built-in Con·X·Us® remote compatibility for smart device monitoring, alongside multi-pump control and outdoor reset functionality.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Lochinvar","offers":[{"title":"Default Title","offer_id":43050609049694,"sku":"WHB055N","price":4165.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/Lochinvar_Knight_high_efficiency_condensing_wall_mount_hydronic_boiler_with_advanced_SMART_SYSTEM_digital_control_interface..webp?v=1781980825"},{"product_id":"lochinvar-100318771-inducer-assy-for-nkc199","title":"Lochinvar 100318771 - Inducer Assembly for NKC199","description":"\u003cp\u003eThe Lochinvar 100318771 Inducer Assembly is a mechanical draft component designed for select Lochinvar heating units. Identified by part number 100318771, this assembly establishes and maintains the airflow required to support combustion and exhaust flue gases. It mounts directly into the combustion air path to support regular equipment operation.\u003c\/p\u003e\u003cp\u003eDraft inducers operate by creating forced or induced airflow through the heat exchanger and venting system. Consistent mechanical draft allows the burner to receive necessary air intake while moving combustion byproducts smoothly through the exhaust outlet during firing cycles.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Designation:\u003c\/strong\u003e Configured for use with Lochinvar NKC199, KHB199N, and KHN285 equipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCombustion Air Movement:\u003c\/strong\u003e Provides the required mechanical draft for controlled air intake and flue exhaust.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Service Component:\u003c\/strong\u003e Designed to replace worn or malfunctioning blower assemblies to restore standard draft operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Dimensions:\u003c\/strong\u003e Packaged in a compact 10\" x 10\" x 5\" footprint for handling and transit.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar NKC199, KHB199N, and KHN285 units. Confirm the part number against your existing part or equipment documentation, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137688797278,"sku":"100318771","price":352.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_972fe456-0aeb-4302-9a00-7a7ce00dec62.png?v=1792524863"},{"product_id":"lochinvar-100271733-noble-nkc110-combination-condensing-gas-boiler","title":"Lochinvar 100271733 - Noble NKC110 Combination Condensing Gas Boiler","description":"\u003cp\u003eLochinvar 100271733 - Noble NKC110 Combination Condensing Gas Boiler.\u003c\/p\u003e\u003cp\u003eBrand: Lochinvar\u003cbr\u003ePart number: 100271733\u003c\/p\u003e\u003cp\u003eBefore ordering, please confirm that this part matches your equipment's model and serial number. If you are not sure, contact National Boiler Supply with your model and serial number and we will help you check.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137695383646,"sku":"100271733","price":3190.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_6de2a082-29b4-4ba3-9280-167550f88581.png?v=1792525028"},{"product_id":"lochinvar-khb199n-knight-floor-mount-fire-tube-boiler-nat-199-000-btu-hr-input","title":"Lochinvar KHB199N - Knight Floor-Mount Fire-Tube Natural Gas Boiler, 199,000 BTU\/hr","description":"\u003cp\u003eThe Lochinvar KHB199N Knight Floor Mount Fire-Tube Natural Gas Boiler is a hydronic heating unit rated for an input capacity of 199,000 BTU\/hr. Built with a stainless steel heat exchanger, this floor-mounted model delivers steady thermal output for closed-loop hydronic heating systems.\u003c\/p\u003e\u003cp\u003eFire-tube boilers direct hot combustion gases through tubes surrounded by system water, providing extensive surface area for effective heat transfer. This configuration promotes uniform temperature transfer and reliable performance during continuous heating cycles.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Capacity:\u003c\/strong\u003e Delivers an input rating of 199,000 BTU\/hr.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Efficiency:\u003c\/strong\u003e Operates at 95% thermal efficiency for optimal fuel performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Exchanger:\u003c\/strong\u003e Constructed with a stainless steel fire-tube heat exchanger.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Configuration:\u003c\/strong\u003e Engineered for natural gas service.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Design:\u003c\/strong\u003e Features a Knight series floor-mount profile.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Knight series hydronic systems. Confirm the part number against your existing unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137716748382,"sku":"KHB199N","price":9027.23,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_0d710e51-2398-4001-a716-d8603b03d01a.png?v=1792525307"},{"product_id":"lochinvar-wbn151-knight-natural-gas-boiler-150000-btu-hr-wall-mount","title":"Lochinvar WBN151 - Knight Natural Gas Boiler, 150,000 BTU\/hr, Wall-Mount","description":"\u003cp\u003eThe Lochinvar WBN151 Knight natural gas boiler delivers 150,000 BTU\/hr of heating capacity in a compact, wall-mount configuration. Designed for hydronic heating systems, this unit utilizes natural gas combustion to supply dependable thermal energy. It offers a practical heating solution for installations requiring high performance within a minimal physical footprint.\u003c\/p\u003e\u003cp\u003eWall-mounted hydronic boilers generate hot water and circulate it through closed piping loops to provide distributed space heating. Equipped with a stainless steel heat exchanger, this unit transfers heat directly from combustion gases into the hydronic loop while keeping equipment off the mechanical room floor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Capacity:\u003c\/strong\u003e Delivers an operating capacity of 150,000 BTU\/hr for hydronic heating demands.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Specification:\u003c\/strong\u003e Configured for natural gas supply lines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Features a stainless steel heat exchanger built for thermal transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Design:\u003c\/strong\u003e Wall-mount configuration optimizes mechanical room layout and saves floor space.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Knight series equipment. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137717108830,"sku":"WBN151","price":5535.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_bf49f2d1-b1fb-4c19-9a6f-cf7bb46d7f36.png?v=1792525315"},{"product_id":"lochinvar-ftx400nm9-firetube-commercial-boiler-for-natural-gas-40000-399900-btu-hr-input","title":"Lochinvar FTX400NM9 - Fire-Tube Commercial Natural Gas Boiler, 40,000-399,900 BTU\/hr","description":"\u003cp\u003eThe Lochinvar FTX400NM9 is a fire-tube commercial natural gas boiler engineered for hydronic heating applications. Operating across an input range from 40,000 to 399,900 BTU\/hr, this unit delivers thermal output using natural gas fuel. It incorporates a stainless steel heat exchanger designed to transfer combustion energy directly into the circulating water loop.\u003c\/p\u003e\u003cp\u003eFire-tube heating systems route combustion gases through tubes surrounded by system water, creating expansive surface area for consistent heat absorption. Adjusting the burner input to match heating demands stabilizes system operating temperatures and minimizes fuel consumption across changing load conditions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModulating Firing Range:\u003c\/strong\u003e Operates from a minimum input of 40,000 BTU\/hr up to a maximum input of 399,900 BTU\/hr.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Thermal Efficiency:\u003c\/strong\u003e Delivers a 98% thermal efficiency rating to optimize fuel utilization.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless Steel Heat Exchanger:\u003c\/strong\u003e Provides reliable heat transfer and resistance to corrosion in hydronic service.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Specification:\u003c\/strong\u003e Engineered for direct integration with natural gas supply lines.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar FTX400NM9 commercial natural gas hydronic heating systems. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137717272670,"sku":"FTX400NM9","price":18594.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_17f6a3c7-4cfe-477b-b78e-700b40d28b4c.png?v=1792525317"},{"product_id":"lochinvar-kbx0400n-knight-xl-commercial-boiler-natural-gas-399-000-btu-hr-input","title":"Lochinvar KBX0400N - Knight XL Commercial Natural Gas Boiler, 399,000 BTU\/hr","description":"\u003cp\u003eThe Lochinvar KBX0400N KNIGHT XL Commercial Boiler delivers hydronic heating performance for demanding heating loops. Operating on natural gas, this boiler provides an input capacity of 399,000 BTU\/hr to supply consistent hot water heating across hydronic distribution systems.\u003c\/p\u003e\u003cp\u003eHydronic boilers transfer thermal energy generated from gas combustion directly into circulating system water. High-efficiency commercial units utilize condensing heat exchangers to capture sensible and latent heat, maximizing thermal performance and optimizing fuel usage during continuous operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Capacity:\u003c\/strong\u003e Delivers a thermal firing rate of 399,000 BTU\/hr.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Efficiency:\u003c\/strong\u003e Engineered to achieve 97% thermal efficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e Configured for natural gas operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Series:\u003c\/strong\u003e Built under the Lochinvar KNIGHT XL commercial boiler series.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar KNIGHT XL commercial hydronic systems. Confirm the part number against your existing unit or job specifications, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137718845534,"sku":"KBX0400N","price":18992.13,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_cea62617-60b3-4110-a48d-5044e7a21dd0.png?v=1792525341"},{"product_id":"lochinvar-whb199n-knight-wall-mount-fire-tube-boiler-nat-199-000-btu-hr-input","title":"Lochinvar WHB199N - Knight Wall-Mount Fire-Tube Natural Gas Boiler, 199,000 BTU\/hr","description":"\u003cp\u003eThe Lochinvar Knight Wall-Mount Fire-Tube Natural Gas Boiler, part number WHB199N, delivers hydronic heating with an input capacity of 199,000 BTU\/hr. Engineered for space-saving wall installation, this unit transfers thermal energy directly into closed-loop hydronic systems. It provides dependable hydronic output using natural gas fuel.\u003c\/p\u003e\u003cp\u003eFire-tube hydronic boilers route hot combustion gases through internal tubes surrounded by system water, enabling steady heat transfer across the exchanger surface. Condensing operation captures thermal energy from combustion products, helping maintain high operating efficiency throughout varying heating demands.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Capacity:\u003c\/strong\u003e Rated for 199,000 BTU\/hr natural gas input.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Efficiency:\u003c\/strong\u003e Delivers 95% thermal efficiency for effective energy utilization.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless Steel Heat Exchanger:\u003c\/strong\u003e Utilizes stainless steel fire-tube construction to transfer heat efficiently to system water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e Configured for natural gas supply lines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Profile:\u003c\/strong\u003e Knight Wall Mount design minimizes mechanical room floor space requirements.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Knight Wall Mount boilers. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137719042142,"sku":"WHB199N","price":9072.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_b06ca98b-b40b-46f3-8e73-ff3f7f3eeb80.png?v=1792525344"},{"product_id":"lochinvar-l-khb199n-condensing-boiler-185000-btu-h-floor-mount","title":"Lochinvar L-KHB199N - Condensing Boiler, 185,000 BTU\/hr, Floor-Mount","description":"\u003cp\u003eThe Lochinvar L-KHB199N is a floor-mount condensing boiler engineered for hydronic heating systems. Utilizing natural gas, this unit provides an input rating of 199,000 BTU\/hr alongside a heating capacity of 185,000 BTU\/hr output. It delivers steady thermal energy to satisfy system demand.\u003c\/p\u003e\u003cp\u003eCondensing boilers capture latent heat from water vapor produced during combustion, transferring that energy back into the hydronic loop. This operating principle improves overall energy extraction compared to standard non-condensing heating equipment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Efficiency:\u003c\/strong\u003e Operates at 95% thermal efficiency for effective energy utilization.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Capacity:\u003c\/strong\u003e Provides 185,000 BTU\/hr output with a 199,000 BTU\/hr input rating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Specification:\u003c\/strong\u003e Engineered for use with natural gas fuel systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Profile:\u003c\/strong\u003e Floor-mount configuration allows direct positioning on mechanical room floor pads.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Suitable for Lochinvar L-KHB199N hydronic heating installations. Confirm the part number against your existing unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137767014494,"sku":"L-KHB199N","price":13049.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_cb1e09cd-8415-4842-bab9-95238d21c7ee.png?v=1792526039"},{"product_id":"lochinvar-whb285n-knight-wall-mount-fire-tube-boiler-nat-285-000-btu-hr-input","title":"Lochinvar WHB285N - Knight Wall-Mount Fire-Tube Natural Gas Boiler, 285,000 BTU\/hr","description":"\u003cp\u003eThe Lochinvar WHB285N Knight Wall-Mount Boiler delivers hydronic heating with an input rating of 285,000 BTU\/hr. Operating on natural gas, this wall-mounted unit utilizes a fire-tube heat exchanger design to provide dependable thermal output for hydronic systems.\u003c\/p\u003e\u003cp\u003eWall-mount hydronic boilers provide space heating by extracting thermal energy from combustion gases through high-efficiency heat exchange surfaces. Modulating firing capability matches the heat output directly to current load conditions, reducing fuel consumption across varying heating demands.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Capacity:\u003c\/strong\u003e Provides an input rating of 285,000 BTU\/hr.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Efficiency:\u003c\/strong\u003e Delivers 95% thermal efficiency for optimal fuel performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModulation Range:\u003c\/strong\u003e Features a 10:1 turndown ratio to closely align output with demand.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Exchanger:\u003c\/strong\u003e Constructed with a durable stainless steel fire-tube heat exchanger.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Specification:\u003c\/strong\u003e Designed for natural gas operation within a compact wall-hung design.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Knight Wall Mount boiler systems. Confirm the part number against your existing unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137769734238,"sku":"WHB285N","price":12210.11,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_35b23903-bc6f-4f6b-863f-4b6bb1b5a973.png?v=1792526062"},{"product_id":"lochinvar-ftx600n-m13-csd-1-natural-gas-commercial-boiler","title":"Lochinvar FTX600N-M13 - CSD-1 Natural Gas Commercial Boiler","description":"\u003cp\u003eThe Lochinvar FTX600N-M13 is a CSD-1 natural gas commercial boiler designed to provide dependable hydronic heating performance. Built with an input rating of 600,000 BTU\/hr and a maximum output of 509,000 BTU\/hr, this model delivers substantial thermal output while maintaining an efficient equipment layout with a footprint of just 6.2 ft².\u003c\/p\u003e\u003cp\u003eCommercial hydronic boilers generate heat through controlled fuel combustion, transferring energy into circulating water to supply building heating loops. Reliable thermal transfer and compact equipment dimensions help optimize mechanical room floor space while maintaining steady system performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Thermal Capacity:\u003c\/strong\u003e Operates at an input rating of 600,000 BTU\/hr and delivers a maximum output of 509,000 BTU\/hr.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Specification:\u003c\/strong\u003e Designed for dedicated operation on natural gas systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpace-Saving Layout:\u003c\/strong\u003e Occupies a floor footprint of 6.2 ft² to ease installation in mechanical rooms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCSD-1 Configuration:\u003c\/strong\u003e Built to satisfy standard CSD-1 requirements for commercial boiler installations.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar FTX600N-M13 commercial boiler systems. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137769963614,"sku":"FTX600N-M13","price":30197.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_89ed2d70-df5a-4721-9fb4-f73aca05b6fe.png?v=1792526064"},{"product_id":"lochinvar-100301987-knight-floor-mount-boiler-199mbh","title":"LOCHINVAR 100301987 - Knight Floor-Mount Boiler, 199 MBH","description":"\u003cp\u003eThe Lochinvar Knight floor-mount boiler (part number 100301987) delivers hydronic heat with an output rating of 199 MBH. Designed as a condensing fire-tube unit, this heating equipment provides thermal energy for closed-loop hydronic systems. Its floor-mounted profile allows straightforward positioning within dedicated mechanical rooms.\u003c\/p\u003e\u003cp\u003eCondensing fire-tube boilers work by passing hot combustion gases through tubes submerged in system water, capturing sensible heat and extracting latent energy as moisture condenses out of the exhaust. This thermal transfer method maximizes energy extraction and maintains steady supply water temperatures for hydronic loops.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Capacity:\u003c\/strong\u003e Delivers a rated heat output of 199 MBH to meet heating demand.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Exchanger Type:\u003c\/strong\u003e Utilizes a condensing fire-tube design to optimize heat transfer to system water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Configuration:\u003c\/strong\u003e Built as a floor-mounted unit for standard mechanical room floor placement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydronic Distribution:\u003c\/strong\u003e Provides continuous heated water circulation for connected hydronic circuits.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Knight series floor-mount hydronic boiler installations. Confirm the part number against your existing unit specifications, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137806368862,"sku":"100301987","price":7713.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_6d3dc1e0-4fe4-42ff-bfcf-0ff5cd0f7b70.png?v=1792526292"},{"product_id":"lochinvar-pum3013-pump-for-power-fin-pf-502-1302-heating-and-hot-water-supply-boilers","title":"Lochinvar PUM3013 - Pump for Power-Fin PF502-1302 Boilers","description":"\u003cp\u003eThe Lochinvar PUM3013 is a hydronic pump designed for use on Lochinvar Power-Fin series boilers. Identified by part number PUM3013, this component provides continuous water circulation through the boiler during active heating cycles.\u003c\/p\u003e\u003cp\u003eCirculator pumps deliver the mechanical force required to maintain fluid movement through the boiler heat exchanger and connected hydronic piping. Maintaining proper flow across internal surfaces ensures stable heat transfer and reliable hydronic system operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Output:\u003c\/strong\u003e Features a 2\/5 HP rating to support required flow demands.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEquipment Match:\u003c\/strong\u003e Built for integration with Lochinvar Power-Fin PF 502-1302 boilers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydronic Circulation:\u003c\/strong\u003e Moves water through the boiler loop to maintain continuous fluid velocity.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Power-Fin PF 502, PF 752, PF 1002, and PF 1302 boilers. Please confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137820721246,"sku":"PUM3013","price":3089.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_f125598e-93b3-43d6-802b-4173737a5492.png?v=1792526482"},{"product_id":"lochinvar-rly2210-user-interface-control-board-for-knight-kb-80-285-heating-boilers","title":"Lochinvar RLY2210 - User Interface Control Board for Knight KB80-285 Boilers","description":"\u003cp\u003eThe Lochinvar RLY2210 is a user interface control board designed for Lochinvar Knight KB80-285 series boilers. This electronic module serves as the direct interface for the heating unit, allowing users to view operational data, review system status, and adjust equipment settings.\u003c\/p\u003e\u003cp\u003eInterface control boards provide the communication bridge between the operator and the unit's main control system. Replacing a worn or unresponsive board restores clear visual readouts and input control required for ongoing equipment monitoring and configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Interaction:\u003c\/strong\u003e Restores clear display readouts and operational input access for the heating unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEquipment Matching:\u003c\/strong\u003e Engineered specifically for Lochinvar Knight KB 80-285 boiler models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoard-Level Replacement:\u003c\/strong\u003e Mounts directly into the designated user control panel location on compatible units.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Knight KB 80-285 boilers. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137821278302,"sku":"RLY2210","price":296.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_8aec2a6a-dda4-4ffc-9557-10f332ff3026.png?v=1792526491"},{"product_id":"lochinvar-100198984-copper-fin-commercial-gas-boiler-495000-btuh-natural-gas-csd-1-cbn0497-m13","title":"Lochinvar 100198984 - Copper-Fin Commercial Natural Gas Boiler, 495,000 BTU\/hr, CSD-1, CBN0497-M13","description":"\u003cp\u003eThe Lochinvar Copper-Fin commercial natural gas boiler, model designation CBN0497-M13 (part number 100198984), delivers a heating capacity of 495,000 BTU\/hr for hydronic heating systems. Engineered with a copper heat exchanger, this unit provides steady hydronic heating with an 81% thermal efficiency rating. It is configured for natural gas fuel and includes CSD-1 control specifications.\u003c\/p\u003e\u003cp\u003eHydronic boilers transfer heat generated by gas combustion into circulating water to supply heating loops and terminal units. The copper-fin heat exchanger facilitates direct, responsive thermal transfer to maintain consistent loop temperatures throughout system operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Capacity:\u003c\/strong\u003e Delivers up to 495,000 BTU\/hr heating input.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Efficiency:\u003c\/strong\u003e Operates at an 81% thermal efficiency rating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Exchanger Material:\u003c\/strong\u003e Constructed with copper heat exchanger surfaces for rapid thermal transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e Configured for natural gas supply under model designation CBN0497-M13.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl Specification:\u003c\/strong\u003e Equipped to meet CSD-1 control standards.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Copper-Fin CBN0497-M13 commercial hydronic heating installations. Confirm the part number against your existing unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137863319646,"sku":"100198984","price":9261.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_e09a9f47-307e-4287-b1e2-31f3ac7c2ba1.png?v=1792527008"},{"product_id":"lochinvar-100361998-boiler-water-heater-natural-gas-199000-btu-hr-direct-spark-ignition-floor-mounted","title":"Lochinvar 100361998 - Natural Gas Boiler\/Water Heater, 199,000 BTU\/hr, Direct Spark Ignition, Floor-Mounted","description":"\u003cp\u003eThe Lochinvar 100361998 is a floor-mounted natural gas boiler and water heater engineered for hydronic heating and hot water production. Delivering an input capacity of 199,000 BTU\/hr, this unit utilizes direct spark ignition to support steady operation. It provides an efficiency rating of 95% AFUE to optimize fuel utilization across heating cycles.\u003c\/p\u003e\u003cp\u003eGas-fired hydronic boilers and water heaters transfer heat generated from fuel combustion directly into water circulating through system piping. Direct spark ignition initiates the burner directly upon each call for heat, ensuring a consistent operational sequence without a standing pilot.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Capacity:\u003c\/strong\u003e Delivers 199,000 BTU\/hr for reliable heating demand coverage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e Configured specifically for natural gas operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Efficiency:\u003c\/strong\u003e Achieves a 95% AFUE rating for efficient thermal conversion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition System:\u003c\/strong\u003e Features direct spark ignition for burner lighting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Profile:\u003c\/strong\u003e Floor-mounted design facilitates stable mechanical positioning.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar natural gas boiler and water heater equipment. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137863843934,"sku":"100361998","price":3923.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_9c13b2a0-fd09-442f-8daa-a572704c39ac.png?v=1792527024"},{"product_id":"lochinvar-khb285n-knight-floor-mount-fire-tube-boiler-nat-285-000-btu-hr-input","title":"Lochinvar KHB285N - Knight Floor-Mount Fire-Tube Natural Gas Boiler, 285,000 BTU\/hr","description":"\u003cp\u003eThe Lochinvar KHB285N Knight is a floor-mount hydronic boiler delivering an input capacity of 285,000 BTU\/hr. Designed to operate on natural gas, this unit provides thermal energy for closed-loop hydronic heating systems.\u003c\/p\u003e\u003cp\u003eFire-tube boilers pass hot combustion gases through internal tubes surrounded by system water, transferring heat directly to the hydronic loop. The stainless steel heat exchanger facilitates condensing operation to capture latent heat and maintain elevated operating efficiency during heating cycles.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Capacity:\u003c\/strong\u003e Delivers an input rating of 285,000 BTU\/hr.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficiency Rating:\u003c\/strong\u003e Operates at 95% AFUE for efficient fuel utilization.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Exchanger:\u003c\/strong\u003e Constructed with a stainless steel fire-tube design for effective heat transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e Configured for natural gas operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Designed as a floor-mount boiler unit.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Designed for hydronic heating applications utilizing Lochinvar Knight KHB285N floor-mount boilers. Confirm the part number and specifications against your existing unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137878360158,"sku":"KHB285N","price":12210.11,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_fe2777f1-b7ce-410d-818d-16cb4141326f.png?v=1792527253"},{"product_id":"lochinvar-whb155n-knight-wall-mount-fire-tube-boiler-nat-155-000-btu-hr-input","title":"Lochinvar WHB155N - Knight Wall-Mount Fire-Tube Natural Gas Boiler, 155,000 BTU\/hr","description":"\u003cp\u003eThe Lochinvar WHB155N is a Knight Wall-Mount fire-tube hydronic heating boiler designed for dependable heat production. Operating on natural gas, this boiler delivers an input rating of 155,000 BTU\/hr for hydronic space heating loops.\u003c\/p\u003e\u003cp\u003eFire-tube heating equipment directs hot combustion gases through tubes surrounded by system water, providing extensive surface contact for effective thermal energy transfer. Its wall-hung form factor reduces the equipment footprint in mechanical areas while keeping core components accessible for regular service and inspection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Rating:\u003c\/strong\u003e Delivers an input capacity of 155,000 BTU\/hr for hydronic thermal demand.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e Configured to operate with natural gas supplies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Exchanger:\u003c\/strong\u003e Constructed with a stainless steel fire-tube heat exchanger for consistent thermal transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Design:\u003c\/strong\u003e Knight Wall Mount configuration maximizes floor space in mechanical rooms.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Knight Wall Mount heating systems. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137878425694,"sku":"WHB155N","price":7600.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_61ff6e46-be20-408b-84a5-5817dd1d811b.png?v=1792527255"},{"product_id":"lochinvar-ftx500n-m13-firetube-commercial-boiler-for-natural-gas-50000-500000-btu-hr-input","title":"Lochinvar FTX500N-M13 - Fire-Tube Commercial Natural Gas Boiler, 50,000-500,000 BTU\/hr","description":"\u003cp\u003eThe Lochinvar FTX500N-M13 is a fire-tube commercial natural gas boiler designed for hydronic heating applications. Operating with an input range from 50,000 to 500,000 BTU\/hr, this unit delivers up to 489,000 BTU\/hr of maximum heat output. It utilizes a stainless steel heat exchanger built for dependable thermal transfer and service life.\u003c\/p\u003e\u003cp\u003eFire-tube boilers route combustion gases through submerged tubes surrounded by system water, providing extensive surface area for effective heat absorption. This construction maintains steady water temperatures and delivers dependable heating under variable load conditions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Efficiency:\u003c\/strong\u003e Delivers 97.7% thermal efficiency to optimize fuel utilization.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Capacity:\u003c\/strong\u003e Provides an input range of 50,000 to 500,000 BTU\/hr with a maximum output of 489,000 BTU\/hr.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Exchanger:\u003c\/strong\u003e Constructed from stainless steel for durable resistance to thermal stress.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical Requirement:\u003c\/strong\u003e Configured for standard 120 VAC, 1-phase electrical service.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhysical Dimensions:\u003c\/strong\u003e Features an overall cabinet size of 53.5\" H x 26.25\" W x 30.5\" D.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar FTX500N-M13 commercial natural gas heating systems. Confirm the model and part number against your existing boiler specifications, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137881440350,"sku":"FTX500N-M13","price":24989.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_28e66aa1-8067-4f45-8fe8-583caa97513d.png?v=1792527307"},{"product_id":"lochinvar-100325669-knight-fire-tube-399-mbtu-natural-gas-water-boiler","title":"LOCHINVAR 100325669 - Knight Fire-Tube Natural Gas Water Boiler, 399 MBH","description":"\u003cp\u003eThe Lochinvar Knight Fire-Tube Natural Gas Water Boiler, part number 100325669, provides hydronic space heating with a rated input capacity of 399 MBH. Built under the Knight Fire Tube 399 model designation, this heating unit utilizes natural gas to deliver reliable thermal output for closed hydronic loops.\u003c\/p\u003e\u003cp\u003eFire-tube condensing boilers circulate hot combustion gases through tubes surrounded by system water, facilitating rapid heat exchange across the heating surfaces. The condensing process captures latent heat from flue vapors, maximizing usable energy output while maintaining balanced operational performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Capacity:\u003c\/strong\u003e Provides 399 MBH thermal input to meet demanding hydronic heating requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Efficiency:\u003c\/strong\u003e Operates at an efficiency rating of 95% AFUE for optimized fuel performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust Heat Exchanger:\u003c\/strong\u003e Features an ASME stainless steel heat exchanger engineered for dependable heat transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Specification:\u003c\/strong\u003e Configured for operation with natural gas supplies.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Designed for Lochinvar Knight Fire Tube 399 heating installations. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137893400670,"sku":"100325669","price":13956.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_0842af87-23a0-4e47-9ad3-bc55e33b8a0d.png?v=1792527569"},{"product_id":"lochinvar-100373129-ftxl-firetube-condensing-boiler-natural-fuel","title":"LOCHINVAR 100373129 - FTXL Fire-Tube Condensing Natural Gas Boiler","description":"\u003cp\u003eThe Lochinvar FTXL Fire-Tube Condensing Natural Gas Boiler, part number 100373129, provides hydronic heating output for demanding system loops. Built under the FTXL Firetube model designation, this unit delivers an input capacity of 725,000 BTU\/hr utilizing natural gas. Its condensing design captures thermal energy from combustion gases to maintain high operational performance.\u003c\/p\u003e\u003cp\u003eFire-tube condensing boilers function by routing hot combustion gases through tubes surrounded by system water, providing extensive surface contact for heat transfer. As exhaust gases cool below their condensation point, latent heat is reclaimed from water vapor to achieve an AFUE rating of 0.972.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Input:\u003c\/strong\u003e Delivers a heating capacity of 725,000 BTU\/hr.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Efficiency:\u003c\/strong\u003e Operates with an AFUE rating of 0.972 to maximize fuel utilization.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVenting Configuration:\u003c\/strong\u003e Engineered for direct vent arrangements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e Configured for use with natural gas supplies.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar FTXL Firetube heating systems. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137934426206,"sku":"100373129","price":28084.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_061afdae-426c-4cac-ae61-8802611e0dd9.png?v=1792527917"},{"product_id":"lochinvar-100301998-knight-floor-mount-fire-tube-boiler-natural-gas-110-000-btu-hr-input","title":"Lochinvar 100301998 - Knight Floor-Mount Fire-Tube Natural Gas Boiler, 110,000 BTU\/hr","description":"\u003cp\u003eThe Lochinvar Knight Floor-Mount Fire-Tube Natural Gas Boiler, part number 100301998, provides hydronic space heating with a heating input capacity of 110,000 BTU\/hr. Built with a fire-tube heat exchanger, this floor-mounted unit delivers controlled thermal output for closed hydronic systems.\u003c\/p\u003e\u003cp\u003eFire-tube hydronic boilers operate by passing hot combustion gases through internal tubes surrounded by system water, facilitating direct energy transfer into the fluid. This configuration provides stable water circulation and uniform heating across the heat exchanger surfaces during operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Capacity:\u003c\/strong\u003e Rated for an input of 110,000 BTU\/hr to satisfy space heating loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Operating Efficiency:\u003c\/strong\u003e Achieves a 95% AFUE efficiency rating for effective fuel utilization.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e Configured for operation with natural gas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Exchanger Design:\u003c\/strong\u003e Features a fire-tube construction for reliable heat transfer to system water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Profile:\u003c\/strong\u003e Designed for floor-mount installation within mechanical equipment spaces.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Knight series hydronic heating systems. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137941962846,"sku":"100301998","price":5382.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_018f1cb6-80bd-4848-9dc9-910005b0ffc4.png?v=1792527991"},{"product_id":"lochinvar-100341192-kbx0650n-m13-knight-xl-condensing-boiler","title":"Lochinvar 100341192 - Knight XL Condensing Boiler, KBX0650N-M13","description":"\u003cp\u003eThe Lochinvar Knight XL Condensing Boiler, model KBX0650N-M13 (part number 100341192), provides high-efficiency hydronic heating powered by natural gas. Engineered with a durable stainless steel heat exchanger, this unit delivers up to 650,000 BTU input to meet heating demands. It utilizes condensing technology to maximize energy recovery during standard operation.\u003c\/p\u003e\u003cp\u003eCondensing boilers operate by capturing latent heat from water vapor produced during combustion before it leaves the exhaust stream. By extracting this extra thermal energy, condensing equipment increases overall system efficiency while maintaining steady water temperatures throughout the hydronic loop.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Capacity:\u003c\/strong\u003e Delivers a 650,000 BTU input rating for substantial heating requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Exchanger Construction:\u003c\/strong\u003e Features a stainless steel heat exchanger designed to handle thermal stress and condensate exposure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Configuration:\u003c\/strong\u003e Engineered specifically for natural gas operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Designation:\u003c\/strong\u003e Identified under Lochinvar model number KBX0650N-M13.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Knight XL series heating installations. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137942159454,"sku":"100341192","price":25006.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_ed83ebe8-b41d-4db3-a9df-398552f4f384.png?v=1792527988"},{"product_id":"lochinvar-100302088-knight-wall-mount-boiler-110mbh","title":"LOCHINVAR 100302088 - Knight Wall-Mount Boiler, 110 MBH","description":"\u003cp\u003eThe Lochinvar Knight Wall Mount boiler, part number 100302088, provides hydronic space heating with an output capacity of 110 MBH. This condensing fire-tube unit is engineered to deliver reliable thermal energy into closed-loop hydronic systems from a space-saving wall-mounted footprint.\u003c\/p\u003e\u003cp\u003eCondensing fire-tube technology works by directing hot flue gases through internal tubes surrounded by circulating system water, effectively capturing both sensible and latent heat. Operating at an efficiency rating of 97% AFUE, the design maximizes fuel efficiency while maintaining steady, responsive heat transfer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Capacity:\u003c\/strong\u003e Delivers an output rating of 110 MBH to meet specified hydronic heating requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Operating Efficiency:\u003c\/strong\u003e Rated at 97% AFUE for optimized fuel consumption and energy performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondensing Fire-Tube Design:\u003c\/strong\u003e Promotes efficient thermal transfer between combustion gases and system water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall-Mount Configuration:\u003c\/strong\u003e Conserves floor space in mechanical rooms while maintaining full operational heating capabilities.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Designed for use as a Lochinvar Knight Wall Mount boiler. Confirm this part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137942913118,"sku":"100302088","price":5355.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_b390aa06-2989-47b3-8f5e-5f4f6e2af3f2.png?v=1792527994"},{"product_id":"lochinvar-fan3035-fan-assembly-for-knight-xl-kbn-399-heating-boilers","title":"Lochinvar FAN3035 - Fan Assembly for Knight XL KBN399 Boilers","description":"\u003cp\u003eThe Lochinvar FAN3035 Fan Assembly is a combustion blower designed for use on Lochinvar Knight XL KBN399 boilers. This assembly delivers required airflow to the burner to support proper fuel combustion and system venting. Designated under part number FAN3035, it serves as a replacement component to maintain correct mechanical draft.\u003c\/p\u003e\u003cp\u003eCombustion fan assemblies introduce and regulate the air supply required for the combustion process within hydronic boilers. Operating during the ignition and firing cycles, the blower moves air through the burner and heat exchanger paths. Replacing a worn or malfunctioning blower assembly restores standard air distribution throughout the unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow Supply:\u003c\/strong\u003e Delivers controlled combustion air through the burner and heat exchanger.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEquipment Matching:\u003c\/strong\u003e Configured for integration into Lochinvar Knight XL KBN 399 heating units.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAssembly Replacement:\u003c\/strong\u003e Provides the designated FAN3035 fan unit for direct service and repair needs.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Designed for Lochinvar Knight XL KBN399 boilers. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137949171806,"sku":"FAN3035","price":1365.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_870491ed-aa2f-44f0-95b0-8044d3f35b17.png?v=1792528040"},{"product_id":"lochinvar-100341182-kbx0800n-m13-knight-xl-condensing-boiler","title":"Lochinvar 100341182 - Knight XL Condensing Boiler, KBX0800N-M13","description":"\u003cp\u003eLochinvar 100341182 - Knight XL Condensing Boiler, KBX0800N-M13.\u003c\/p\u003e\u003cp\u003eBrand: Lochinvar\u003cbr\u003ePart number: 100341182\u003c\/p\u003e\u003cp\u003eBefore ordering, please confirm that this part matches your equipment's model and serial number. If you are not sure, contact National Boiler Supply with your model and serial number and we will help you check.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43137949565022,"sku":"100341182","price":29857.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_afe9d9a0-d408-482a-b7cc-3a97bfdd6e97.png?v=1792528043"},{"product_id":"lochinvar-khb-199-natural-gas-boiler-199mbh-floor-mount-100301987","title":"Lochinvar KHB-199 - Natural Gas Boiler, 199 MBH, Floor-Mount","description":"\u003cp\u003eThe Lochinvar KHB-199 (part number KHB-199100301987-CL) is a floor-mount hydronic boiler engineered for natural gas heating applications. Delivering an input rating of 199 MBH, this boiler is designed to supply dependable thermal energy for hydronic heating loops.\u003c\/p\u003e\u003cp\u003eHydronic boilers transfer heat directly into circulating water to distribute warmth across closed-loop piping configurations. Utilizing advanced combustion technology, high-efficiency gas units maximize energy utilization to deliver consistent heat output during demand cycles.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Capacity:\u003c\/strong\u003e Provides 199 MBH input capacity for hydronic system demands.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Operating Efficiency:\u003c\/strong\u003e Operates at an efficiency rating of 96% AFUE.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Configuration:\u003c\/strong\u003e Engineered for use with natural gas fuel supplies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFloor-Mount Design:\u003c\/strong\u003e Configured for floor-standing installation within mechanical spaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Designation:\u003c\/strong\u003e Identified under Lochinvar model KHB-199.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar KHB-199 natural gas boiler installations. Confirm the part number against your existing unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138020212830,"sku":"KHB-199100301987-CL","price":7367.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_218d0d95-572a-4561-bcdc-4f414e33961f.png?v=1792528587"},{"product_id":"lochinvar-nkb199n-noble-boiler","title":"LOCHINVAR NKB199N - Noble Boiler","description":"\u003cp\u003eThe Lochinvar NKB199N Noble Boiler, part number NKB199N-CL, provides hydronic heating for closed-loop water systems. Built with a fire-tube heat exchanger, this unit delivers steady thermal output to meet hydronic heating requirements.\u003c\/p\u003e\u003cp\u003eHydronic boilers transfer heat generated from fuel combustion into circulating water for space heating distribution. The fire-tube construction directs hot combustion gases through tubes surrounded by system water, providing dependable thermal conductivity throughout operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire-Tube Heat Exchanger:\u003c\/strong\u003e Constructed with a fire-tube design that facilitates direct thermal exchange between combustion gases and system water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Configuration:\u003c\/strong\u003e Engineered to the NKB199N Noble model designation for hydronic heating applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Distribution:\u003c\/strong\u003e Supplies heated water directly to connected hydronic distribution loops and heating circuits.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Noble series NKB199N heating equipment. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138026897502,"sku":"NKB199N-CL","price":4286.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_43f75dde-b44b-4dd7-832f-a63078a5d095.png?v=1792528617"},{"product_id":"lochinvar-nkb080n-nat-gas-boiler-noble-80mbh","title":"Lochinvar NKB080N - Noble Natural Gas Boiler, 80 MBH","description":"\u003cp\u003eThe Lochinvar Noble NKB080N-CL is a natural gas condensing boiler engineered to deliver hydronic heating. Featuring an 80 MBH capacity, this unit provides steady heat delivery through an integrated fire-tube heat exchanger configuration. It is built to support efficient space heating performance across demanding hydronic system layouts.\u003c\/p\u003e\u003cp\u003eCondensing fire-tube boilers operate by transferring combustion heat into the system water while extracting latent heat from water vapor in the flue gases. This process improves overall fuel efficiency and supports consistent temperature regulation throughout the heating loop.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Output:\u003c\/strong\u003e Rated for an 80 MBH heat output to meet hydronic heating loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Specification:\u003c\/strong\u003e Designed for dedicated operation with natural gas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire-Tube Heat Exchanger:\u003c\/strong\u003e Employs condensing fire-tube technology to maximize heat extraction from combustion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Series:\u003c\/strong\u003e Belongs to the Lochinvar Noble family of heating equipment.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Noble series hydronic heating systems. Confirm the part number against your existing equipment, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138029453406,"sku":"NKB080N-CL","price":3202.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_be55ac40-5ed8-4731-870a-77aca6fd9d20.png?v=1792528638"},{"product_id":"lochinvar-nkc150n-combi-boiler-nat-gas-150mbh","title":"LOCHINVAR NKC150N - Combi Boiler, Natural Gas, 150 MBH","description":"\u003cp\u003eThe Lochinvar NKC150N combi boiler, part number NKC150N-CL, supplies space heating and domestic hot water from a single appliance. Operating on natural gas, this unit provides a heating capacity of 150 MBH for hydronic heating systems.\u003c\/p\u003e\u003cp\u003eCombination boilers integrate domestic hot water production and space heating within one chassis, routing thermal energy through an onboard heat exchanger. The fire-tube design channels combustion gases through submerged tubes to transfer heat directly into the circulating water.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Capacity:\u003c\/strong\u003e Provides an operating capacity of 150 MBH.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Configuration:\u003c\/strong\u003e Built for use with natural gas fuel systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Exchanger Design:\u003c\/strong\u003e Features a fire-tube heat exchanger configuration for thermal energy transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Designation:\u003c\/strong\u003e Corresponds to Lochinvar model NKC150N.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar NKC150N combination boiler equipment. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138029879390,"sku":"NKC150N-CL","price":3122.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_03b86950-7035-44f6-9101-382fc96a66df.png?v=1792528641"},{"product_id":"lochinvar-kbn601-m13-natural-gas-boiler-600-mbh","title":"Lochinvar KBN601-M13 - Natural Gas Boiler, 600 MBH","description":"\u003cp\u003eThe Lochinvar KBN601-M13 Natural Gas Boiler, part number KBN601-M13-CL, provides dedicated hydronic space heating with a heating capacity of 600 MBH. Built with a fire-tube body construction, this natural gas unit delivers steady heat output for hydronic distribution systems. Operating with a 94.6% AFUE efficiency rating, it is designed for effective thermal transfer during active heating cycles.\u003c\/p\u003e\u003cp\u003eFire-tube hydronic boilers pass hot combustion gases through internal tubes surrounded by system water, facilitating heat transfer into the loop. This configuration supports stable water volume and heat distribution under varying heating loads. Maintaining proper equipment matches helps ensure consistent loop temperatures and operational reliability across the heating system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Capacity:\u003c\/strong\u003e Provides an input rating of 600 MBH.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficiency Rating:\u003c\/strong\u003e Operates at 94.6% AFUE for efficient fuel utilization.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire-Tube Construction:\u003c\/strong\u003e Engineered with a fire-tube heat exchanger body for direct thermal exchange.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Configuration:\u003c\/strong\u003e Designed for operation with natural gas supplies.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar KBN601-M13 heating systems. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138030108766,"sku":"KBN601-M13-CL","price":16549.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_5b98bc30-42ea-44d8-b9ea-353f4769acaa.png?v=1792528643"},{"product_id":"lochinvar-100271679-noble-boiler-80mbh","title":"LOCHINVAR 100271679 - Noble Boiler, 80 MBH","description":"\u003cp\u003eThe Lochinvar Noble Boiler, part number 100271679, is an 80 MBH condensing fire-tube boiler built to provide dependable hydronic space heating. This unit integrates advanced heat exchanger technology to deliver consistent thermal output for closed-loop hydronic heating applications.\u003c\/p\u003e\u003cp\u003eCondensing fire-tube boilers extract usable thermal energy from combustion gases, capturing latent heat as moisture condenses within the heat exchanger. This configuration promotes efficient heat transfer directly to the circulating system water while supporting continuous hydronic system demand.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Output:\u003c\/strong\u003e Provides a rated heating capacity of 80 MBH for hydronic heating loops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire-Tube Design:\u003c\/strong\u003e Utilizes condensing fire-tube construction to optimize thermal transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Weight:\u003c\/strong\u003e Built with a total weight of 125 lbs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Designation:\u003c\/strong\u003e Configured as a Lochinvar Noble Boiler series heating unit.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Noble Boiler hydronic heating installations. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138034139230,"sku":"100271679","price":2983.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_8d55866d-9704-4afb-9bc0-15475986c25a.png?v=1792528661"},{"product_id":"lochinvar-100271731-noble-boiler-199mbh","title":"LOCHINVAR 100271731 - Noble Boiler, 199 MBH","description":"\u003cp\u003eThe Lochinvar Noble Boiler (part number 100271731) is a hydronic heating unit engineered for dependable thermal performance. Featuring condensing fire-tube technology, this model delivers a heating capacity of 199 MBH to meet system heating requirements. It acts as the primary heat source to maintain steady hot water delivery across hydronic heating circuits.\u003c\/p\u003e\u003cp\u003eCondensing fire-tube boilers function by passing hot combustion gases through internal tubes surrounded by water, maximizing heat absorption. By cooling flue gases to the point where moisture condenses, these units extract latent energy to achieve high operating efficiency and reduce overall fuel consumption.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Capacity:\u003c\/strong\u003e Delivers a 199 MBH rated thermal output to satisfy space heating demands.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondensing Technology:\u003c\/strong\u003e Recovers latent heat from exhaust vapor to maximize fuel utilization and operating efficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire-Tube Design:\u003c\/strong\u003e Routes combustion gases through submerged tubes to ensure effective heat exchange into system water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Series:\u003c\/strong\u003e Built under the Lochinvar Noble boiler platform for hydronic system installations.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Noble series hydronic heating installations. Please confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138036105310,"sku":"100271731","price":3840.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_15e0bb26-050c-441c-85bd-129917b26f6d.png?v=1792528682"},{"product_id":"lochinvar-100302085-knight-wall-mount-boiler-199mbh","title":"LOCHINVAR 100302085 - Knight Wall-Mount Boiler, 199 MBH","description":"\u003cp\u003eThe Lochinvar Knight Wall-Mount Boiler, part number 100302085, delivers a heating capacity of 199 MBH for hydronic heating applications. Designed for wall-mounted installation, this heating unit provides thermal energy transfer using an integrated fire-tube heat exchanger. It delivers high-output hydronic heating while maintaining a compact vertical profile.\u003c\/p\u003e\u003cp\u003eHydronic wall-mounted boilers heat water for hydronic distribution systems by transferring thermal energy from combustion gases through a heat exchanger into circulating water. The fire-tube configuration passes combustion gases through internal tubes surrounded by fluid, maximizing surface contact for steady heat transfer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Capacity:\u003c\/strong\u003e Delivers an operating capacity of 199 MBH for hydronic heating loops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Exchanger Design:\u003c\/strong\u003e Employs a fire-tube heat exchanger configuration for reliable thermal transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Dimensions:\u003c\/strong\u003e Measures 19\" L x 18\" W x 41\" H with a dry weight of 175 lbs to fit designated equipment layouts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall-Mount Installation:\u003c\/strong\u003e Engineered as a wall-hung unit to optimize floor space in utility areas.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Knight Wall Mount Boiler systems. Confirm the part number against your existing unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138039054430,"sku":"100302085","price":8057.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_6e81688d-3d8b-4055-a80a-9ef39fb1a821.png?v=1792528712"},{"product_id":"lochinvar-100361994-natural-gas-boiler-water-heater","title":"LOCHINVAR 100361994 - Natural Gas Boiler\/Water Heater","description":"\u003cp\u003eThe Lochinvar 100361994 is a natural gas boiler and water heater engineered for hydronic heating applications. Rated at 150,000 Btu\/hr input capacity, this unit provides high-efficiency heat generation for hydronic loops. It utilizes direct spark ignition to light natural gas fuel reliably during each call for heat.\u003c\/p\u003e\u003cp\u003eHydronic boilers and water heaters transfer heat energy from gas combustion directly into circulating system water. Maintaining high thermal performance across continuous heating demands helps optimize fuel utilization while delivering steady supply temperatures.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Rating:\u003c\/strong\u003e Delivers an input capacity of 150,000 Btu\/hr for hydronic heating systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Efficiency:\u003c\/strong\u003e Delivers a 95% AFUE rating to maximize fuel utilization.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition Type:\u003c\/strong\u003e Operates using direct spark ignition for direct burner activation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVenting Dimension:\u003c\/strong\u003e Connects to a 3-inch vent diameter for combustion exhaust.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Configuration:\u003c\/strong\u003e Engineered specifically for natural gas operation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Designed for Lochinvar natural gas heating equipment. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138039480414,"sku":"100361994","price":3512.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_59aba218-d98b-41af-8529-555f65d49320.png?v=1792528716"},{"product_id":"lochinvar-ftx850n-m13-csd-1-natural-gas-commercial-boiler","title":"Lochinvar FTX850N-M13 - CSD-1 Natural Gas Commercial Boiler","description":"\u003cp\u003eThe Lochinvar FTX850N-M13 is a CSD-1 natural gas commercial boiler designed to supply hydronic heating. Operating on natural gas, this unit provides an input capacity of up to 850,000 BTU\/hr and a maximum output of 825,000 BTU\/hr.\u003c\/p\u003e\u003cp\u003eCommercial hydronic boilers transfer thermal energy from combustion to water circulated through a closed-loop piping network. By modulating burner output according to heating demand, the boiler maintains system water temperatures while optimizing fuel usage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Efficiency:\u003c\/strong\u003e Achieves a 97% thermal efficiency rating during operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless Steel Heat Exchanger:\u003c\/strong\u003e Built with a stainless steel heat exchanger for effective heat transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModulating Turndown:\u003c\/strong\u003e Offers a 10:1 turndown ratio to adjust firing output to current heating loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Capacity:\u003c\/strong\u003e Delivers up to 850,000 BTU\/HR maximum input and 825,000 BTU\/HR maximum output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl Configuration:\u003c\/strong\u003e Configured for CSD-1 natural gas service.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar FTX850N-M13 commercial boiler installations. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138040397918,"sku":"FTX850N-M13","price":38624.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_28f45a2f-cacb-44e4-959f-59178c166d48.png?v=1792528725"},{"product_id":"lochinvar-khb055n-knight-floor-mount-fire-tube-boiler-nat-55-000-btu-hr-input","title":"Lochinvar KHB055N - Knight Floor-Mount Fire-Tube Natural Gas Boiler, 55,000 BTU\/hr","description":"\u003cp\u003eThe Lochinvar Knight Floor-Mount Fire-Tube Natural Gas Boiler, part number KHB055N, provides hydronic space heating with an input rating of 55,000 BTU\/hr. Designed with a fire-tube configuration, this boiler transfers heat from combustion gases directly into the surrounding system water. It delivers dependable thermal energy to maintain consistent hydronic heating performance.\u003c\/p\u003e\u003cp\u003eFire-tube boilers operate by routing hot combustion gases through internal tubes submerged in boiler water, offering an expansive heat transfer surface area. This arrangement supports uniform heat exchange and reliable system water heating across operating cycles.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Capacity:\u003c\/strong\u003e Rated for a maximum input of 55,000 BTU\/hr.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Output:\u003c\/strong\u003e Provides up to 51,000 BTU\/hr maximum heat output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Exchanger Material:\u003c\/strong\u003e Built with a stainless steel heat exchanger for effective thermal transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e Configured for operation with natural gas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Design:\u003c\/strong\u003e Features a floor-mount configuration for secure mechanical room installation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Knight KHB055N heating systems. Confirm the part number against your existing equipment, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138051440734,"sku":"KHB055N","price":5867.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_a40f355d-0b90-4b1e-8735-41d122c2f334.png?v=1792528817"},{"product_id":"lochinvar-100136757-cbn215-gas-boiler-215000-btu-hr-input","title":"Lochinvar 100136757 - CBN215 Gas Boiler, 215,000 BTU\/hr","description":"\u003cp\u003eThe Lochinvar CBN215 Gas Boiler (part number 100136757) delivers hydronic heat with an input capacity of 215,000 Btu\/hr. Designed for hydronic heating systems, this unit generates hot water to meet heating demands across connected fluid distribution loops.\u003c\/p\u003e\u003cp\u003eGas boilers operate by combusting fuel to transfer thermal energy into circulating water, which is then routed through system piping. Proper heating capacity and system integration ensure steady hydronic operation and dependable heat delivery throughout regular duty cycles.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Input:\u003c\/strong\u003e Delivers a rated input capacity of 215,000 Btu\/hr.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Efficiency:\u003c\/strong\u003e Features an 84% AFUE efficiency rating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePiping Connection:\u003c\/strong\u003e Configured with 1.5 inch NPT connections for integration into system loops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Designation:\u003c\/strong\u003e Identified under Lochinvar model CBN215.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar CBN215 gas boiler installations. Confirm the part number against your existing unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138059927646,"sku":"100136757","price":3790.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_70aa5461-c33b-494d-8408-34101c2443af.png?v=1792528897"},{"product_id":"lochinvar-100301982-knight-floor-mount-boiler-55mbh","title":"LOCHINVAR 100301982 - Knight Floor-Mount Boiler, 55 MBH","description":"\u003cp\u003eThe Lochinvar Knight Floor-Mount Boiler, part number 100301982, is a condensing hydronic heating unit providing an output of 55 MBH. Engineered with a fire-tube configuration, this floor-mounted boiler produces controlled thermal energy for hydronic heating loops.\u003c\/p\u003e\u003cp\u003eCondensing fire-tube boilers extract usable heat from combustion byproducts by condensing water vapor within the flue stream. This design routes hot gases through tubes surrounded by system water, facilitating balanced heat absorption and dependable thermal delivery.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Output:\u003c\/strong\u003e Delivers a heating output rating of 55 MBH for hydronic heating demands.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondensing Fire-Tube Construction:\u003c\/strong\u003e Utilizes a condensing fire-tube heat exchanger design to capture latent energy from combustion gases.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFloor-Mount Profile:\u003c\/strong\u003e Configured for secure floor placement with a total unit weight of 169 lb.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Knight floor-mount hydronic boiler installations. Please confirm this part number against your existing unit specifications, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138061467742,"sku":"100301982","price":5081.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_5a6d56c4-e1ea-46ad-8782-736916e5d2e1.png?v=1792528912"},{"product_id":"lochinvar-100301983-knight-floor-mount-boiler-85mbh","title":"LOCHINVAR 100301983 - Knight Floor-Mount Boiler, 85 MBH","description":"\u003cp\u003eThe Lochinvar Knight Floor-Mount Boiler (part number 100301983) delivers hydronic space heating with an input rating of 85 MBH. Configured with an integrated fire-tube heat exchanger, this floor-standing unit heats water to satisfy system thermal demands. It serves as a central heating source engineered for dependable operation in closed-loop hydronic networks.\u003c\/p\u003e\u003cp\u003eHydronic boilers transfer heat from fuel combustion into circulating water that travels through distribution piping to terminal units like radiators or air handlers. Utilizing a fire-tube arrangement, hot combustion gases flow through internal tubes submerged in water, facilitating direct thermal transfer across the heating surface.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Rating:\u003c\/strong\u003e Delivers an 85 MBH thermal input capacity to handle hydronic heating requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire-Tube Heat Exchanger:\u003c\/strong\u003e Features a fire-tube design that channels combustion gases through submerged tubes for effective heat absorption.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFloor-Mounted Design:\u003c\/strong\u003e Built in a Knight floor-mount configuration for stable placement in mechanical equipment areas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydronic Heat Transfer:\u003c\/strong\u003e Generates and delivers heated water across closed-loop hydronic heating circuits.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Knight floor-mount hydronic heating equipment. Confirm the part number against your existing unit or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138062221406,"sku":"100301983","price":5418.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_d4f99080-bcc5-4ab0-9ac8-2653e0dd4fd9.png?v=1792528918"},{"product_id":"lochinvar-whb085n-knight-wall-mount-fire-tube-boiler-nat-85-000-btu-hr-input","title":"Lochinvar WHB085N - Knight Wall-Mount Fire-Tube Natural Gas Boiler, 85,000 BTU\/hr","description":"\u003cp\u003eThe Lochinvar WHB085N Knight Wall-Mount Fire-Tube Natural Gas Boiler delivers dependable hydronic heating with an input rating of 85,000 BTU\/hr. Configured with a stainless steel body construction, this boiler utilizes a fire-tube heat exchanger design to transfer thermal energy into circulating system fluid. It achieves a 95% thermal efficiency rating, supporting effective fuel utilization during heating cycles.\u003c\/p\u003e\u003cp\u003eFire-tube hydronic boilers pass hot combustion gases through internal tubes submerged in system water, providing extensive surface contact for heat exchange. In modern heating systems, condensing wall-mount units maintain steady water temperatures while optimizing energy consumption across varying thermal loads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Rating:\u003c\/strong\u003e Delivers 85,000 BTU\/hr using natural gas fuel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Efficiency:\u003c\/strong\u003e Operates at 95% thermal efficiency for high-efficiency heat transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody Construction:\u003c\/strong\u003e Engineered with stainless steel construction for long-term thermal service.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Design:\u003c\/strong\u003e Features a Knight wall-mount configuration to minimize equipment footprint.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Designed for Lochinvar Knight series hydronic heating systems requiring a WHB085N boiler. Confirm the part number against your existing unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138065530974,"sku":"WHB085N","price":6071.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_ca4475f1-9be1-4b3c-a3a2-9571675a8b62.png?v=1792528948"},{"product_id":"lochinvar-ftx725n-m13-csd-1-natural-gas-commercial-boiler","title":"Lochinvar FTX725N-M13 - CSD-1 Natural Gas Commercial Boiler","description":"\u003cp\u003eThe Lochinvar FTX725N-M13 is a natural gas commercial boiler engineered for fire-tube condensing hydronic heating applications. Built under model designation FTX725N-M13, this unit is configured with CSD-1 controls to deliver dependable heating output.\u003c\/p\u003e\u003cp\u003eFire-tube condensing boilers extract heat by passing combustion gases through tubes submerged in system water, capturing both sensible heat and latent heat as water vapor condenses. This heat exchanger layout supports balanced heat distribution and maintains effective thermal transfer throughout hydronic loops.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Efficiency:\u003c\/strong\u003e Delivers up to 98% thermal efficiency during condensing operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Exchanger Type:\u003c\/strong\u003e Utilizes a fire-tube condensing design for hydronic water heating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Specification:\u003c\/strong\u003e Configured for natural gas operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCode Specification:\u003c\/strong\u003e Equipped to satisfy CSD-1 commercial boiler code requirements.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar FTX725N-M13 commercial boiler systems. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138066120798,"sku":"FTX725N-M13","price":34797.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_8a4eb5e5-7db4-4749-a8a4-e71b8d8a7bb1.png?v=1792528954"},{"product_id":"lochinvar-100271735-noble-nkc199-high-efficiency-combination-condensing-gas-boiler-natural-gas-fuel","title":"Lochinvar 100271735 - Noble NKC199 High-Efficiency Combination Condensing Natural Gas Boiler","description":"\u003cp\u003eThe Lochinvar Noble NKC199 High-Efficiency Combination Condensing Natural Gas Boiler (part number 100271735) supplies both hydronic space heating and domestic hot water from a single unit. Engineered for hydronic heating loops, this combination condensing appliance captures sensible and latent heat during the combustion process to optimize heating performance.\u003c\/p\u003e\u003cp\u003eCondensing boilers work by extracting thermal energy from flue gases before they exit the exhaust system, transferring that heat into circulating hydronic water. Combination units streamline heating infrastructure by managing space heating and on-demand hot water production within one integrated system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Designation:\u003c\/strong\u003e Built under Lochinvar model designation NKC199.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Capacity:\u003c\/strong\u003e Provides a heating capacity rated at 185 MBtu\/hr.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAFUE Efficiency:\u003c\/strong\u003e Delivers high-efficiency operation rated at 95% AFUE.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Specification:\u003c\/strong\u003e Designed for operation using natural gas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePiping Connection:\u003c\/strong\u003e Features 1-inch NPT connections for integration into system piping.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Compatible with systems engineered for the Lochinvar Noble NKC199 series boiler. Confirm this part number against your existing equipment specifications, or contact National Boiler Supply with your unit model and serial number to verify prior to ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138068840542,"sku":"100271735","price":3835.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_d6cc2064-f60f-4fe6-beb0-dc01c81610aa.png?v=1792528981"},{"product_id":"lochinvar-100271730-noble-fire-tube-high-efficiency-natural-gas-wall-hung-condensing-water-boiler-150000-btu","title":"Lochinvar 100271730 - Noble Fire-Tube High-Efficiency Natural Gas Wall-Hung Condensing Boiler, 150,000 BTU","description":"\u003cp\u003eThe Lochinvar 100271730 Noble wall-hung condensing boiler provides hydronic space heating with a capacity of 150,000 BTU. Engineered with a fire-tube heat exchanger and fueled by natural gas, this high-efficiency unit delivers hydronic heating in a compact footprint.\u003c\/p\u003e\u003cp\u003eCondensing boilers capture latent heat from water vapor produced during combustion, significantly lowering fuel consumption compared to standard non-condensing designs. Fire-tube arrangements circulate hot combustion gases through internal tubes surrounded by water, promoting efficient heat transfer across the heat exchanger surface.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Capacity:\u003c\/strong\u003e Provides an input rating of 150,000 BTU.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficiency Rating:\u003c\/strong\u003e Achieves 95% AFUE for high-efficiency fuel performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Exchanger Type:\u003c\/strong\u003e Built with a fire-tube heat exchanger for effective thermal transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Style:\u003c\/strong\u003e Wall-hung configuration saves floor space.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e Operates on natural gas.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Noble series boilers. Confirm the part number against your existing unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138069364830,"sku":"100271730","price":3338.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_8ac25adf-1bea-4628-ba18-ef5fd7e4047b.png?v=1792528985"},{"product_id":"lochinvar-100301999-knight-floor-mount-boiler-155mbh","title":"LOCHINVAR 100301999 - Knight Floor-Mount Boiler, 155 MBH","description":"\u003cp\u003eThe Lochinvar Knight Floor-Mount Boiler (part number 100301999) delivers hydronic space heating with a heating capacity of 155 MBH. Designed as a condensing unit, this boiler utilizes an integrated fire-tube heat exchanger to achieve high thermal performance. Its floor-standing configuration provides a stable footprint for mechanical room installations.\u003c\/p\u003e\u003cp\u003eCondensing boilers operate by capturing latent heat from water vapor in the combustion gases that would otherwise escape through the exhaust. Within the fire-tube design, hot flue gases travel through internal tubes surrounded by system water, promoting effective heat transfer across the heating surface.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Performance Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Capacity:\u003c\/strong\u003e Rated for a 155 MBH output to supply hydronic heating demands.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondensing Operation:\u003c\/strong\u003e Extracts heat from combustion exhaust to enhance thermal performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire-Tube Heat Exchanger:\u003c\/strong\u003e Transfers combustion heat through internal tubes surrounded by circulating water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFloor-Mount Configuration:\u003c\/strong\u003e Built in a Knight floor-standing layout for direct placement in equipment rooms.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Lochinvar Knight Floor Mount boiler installations. Confirm the part number against your existing part or unit, or send your model and serial number to National Boiler Supply to verify before ordering.\u003c\/p\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":43138072576094,"sku":"100301999","price":6462.31,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/nbs_image_placeholder_44ae3373-6293-4bd2-aece-f65729b95aec.png?v=1792529009"}],"url":"https:\/\/nationalboilersupply.com\/collections\/boilers-heating.oembed?page=4","provider":"National Boiler Supply","version":"1.0","type":"link"}