{"product_id":"armstrong-573100-011-a800-l-expansion-tank","title":"Armstrong 573100-011 A800-L Expansion Tank","description":"\u003cp\u003eEfficient hydronic system pressure regulation is made simple with the \u003cstrong\u003eArmstrong 573100-011\u003c\/strong\u003e, an essential component for the A800-L series. This high-quality expansion tank is engineered to absorb excess fluid volume caused by thermal expansion, preventing dangerous pressure spikes and protecting sensitive system components from premature wear.\u003c\/p\u003e\u003cp\u003eThe vessel functions by utilizing an internal diaphragm that separates the system water from a pressurized air cushion. As the boiler heats the water, the resulting expansion pushes against the diaphragm, allowing the system to maintain stable pressure levels without the need for constant venting. This closed-loop design also helps minimize oxygen infiltration, which is critical for reducing corrosion and extending the service life of your piping and heat exchangers.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Regulation:\u003c\/strong\u003e Precisely manages thermal expansion to maintain consistent system pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent Protection:\u003c\/strong\u003e Extends the lifespan of pumps, valves, and boilers by mitigating pressure-related stress.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Efficiency:\u003c\/strong\u003e Maintains a sealed environment to prevent oxidation and optimize heat transfer.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Designed specifically for residential and light commercial hydronic heating applications where reliable pressure management and ease of installation are required.\u003c\/p\u003e","brand":"Armstrong","offers":[{"title":"Default Title","offer_id":43133418045534,"sku":"573100-011","price":9171.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/573100_011_image_f3dc582d-0465-4a93-b143-5d391515e314.png?v=1786105643","url":"https:\/\/nationalboilersupply.com\/products\/armstrong-573100-011-a800-l-expansion-tank","provider":"National Boiler Supply","version":"1.0","type":"link"}