{"product_id":"bell-gossett-1bn331-hft-40v-hydronic-heating-expansion-tank","title":"Bell \u0026 Gossett 1BN331 HFT-40V Hydronic Heating Expansion Tank","description":"\u003cp\u003eEfficiently manage thermal expansion in your hydronic heating system with the high-performance \u003cstrong\u003e1BN331\u003c\/strong\u003e \u003cstrong\u003eHFT-40V\u003c\/strong\u003e expansion tank from Bell \u0026amp; Gossett. Engineered to maintain consistent system pressure, this durable 20-gallon vessel protects your boiler and piping components from the damaging effects of water volume fluctuations caused by temperature changes.\u003c\/p\u003e\u003cp\u003eThis diaphragm-style tank features a pre-charged air cushion separated from the system water by a heavy-duty butyl rubber diaphragm. As the water in your heating system expands during the heating cycle, it pushes against the diaphragm, compressing the air cushion to absorb the excess volume, thereby preventing pressure spikes and potential relief valve discharge.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Regulation:\u003c\/strong\u003e Effectively stabilizes fluctuating internal system pressures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir Separation:\u003c\/strong\u003e Integrated design prevents oxygen from entering the system, reducing corrosion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Heavy-gauge steel shell provides structural integrity and long-term reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Compatibility:\u003c\/strong\u003e Ideal for residential and light commercial closed-loop hydronic heating applications.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Recommended for closed-loop hydronic heating systems, radiant floor heating zones, and boiler baseboard heating circuits requiring reliable pressure control.\u003c\/p\u003e","brand":"Bell \u0026 Gossett","offers":[{"title":"Default Title","offer_id":43127869014110,"sku":"1BN331","price":374.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/1BN331_image_7ed9ab5c-bbb5-4f16-85df-70ce37135bd1.jpg?v=1786058478","url":"https:\/\/nationalboilersupply.com\/products\/bell-gossett-1bn331-hft-40v-hydronic-heating-expansion-tank","provider":"National Boiler Supply","version":"1.0","type":"link"}