{"product_id":"amtrolamtrst5c-amtr-st-5-c-thermal-expansion-tank-2-1-gal","title":"AMTROLAMTRST5C AMTR-ST-5-C Thermal Expansion Tank 2.1 Gal","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe AMTROLAMTRST5C AMTR-ST-5-C is a 2.1-gallon ASME-rated thermal expansion tank designed to control pressure in commercial closed potable hot water systems. Built with a steel shell finished in red oxide primer and a polypropylene inner lining, the tank uses a heavy-duty butyl diaphragm to absorb system expansion and protect water heaters and plumbing fixtures from pressure surges. It arrives factory pre-charged at 55 PSIG and carries a pressure rating of 250 PSIG with a maximum temperature rating of 200 degrees F. A licensed plumber or mechanical contractor typically handles installation in commercial hydronic or domestic hot water systems.\u003c\/p\u003e\n\u003cp\u003eThis expansion tank is intended for commercial closed, potable hot water applications where pressure control and code compliance are required. Its ASME certification makes it suitable for jurisdictions that mandate code-stamped vessels on commercial domestic hot water systems. The inline design and 3\/4-inch male threaded inlet and outlet connection fit standard piping configurations found in commercial water heater installations. The maximum acceptance volume is 0.9 gallon, sizing it for smaller commercial expansion control applications.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eASME-certified construction meets code requirements for commercial potable hot water systems\u003c\/li\u003e\n  \u003cli\u003eNSF\/ANSI 61 listed for contact with potable water\u003c\/li\u003e\n  \u003cli\u003eFactory pre-charged at 55 PSIG — reduces field setup time\u003c\/li\u003e\n  \u003cli\u003eHeavy-duty butyl diaphragm rated for repeated expansion cycles\u003c\/li\u003e\n  \u003cli\u003e3\/16-inch Schrader valve with EPDM seat for field pressure adjustment\u003c\/li\u003e\n  \u003cli\u003eStainless steel system connection for corrosion resistance at the inlet and outlet\u003c\/li\u003e\n  \u003cli\u003eLead-free construction complies with applicable potable water standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for commercial closed, potable hot water systems requiring ASME-certified thermal expansion control. Consult the system expansion tank sizing chart to confirm this 2.1-gallon tank with a 0.9-gallon maximum acceptance volume is appropriate for the specific system pressure and volume requirements.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed plumber or mechanical contractor in accordance with the International Plumbing Code and applicable local amendments. Shut off the cold water supply and depressurize the system before making any connections. Verify the factory air pre-charge matches the system cold-water supply pressure before connecting the tank — adjust through the Schrader valve if necessary. Do not exceed the 250 PSIG pressure rating or 200 degrees F temperature rating of the tank.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTank Capacity\u003c\/strong\u003e: 2.1 gallons\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Acceptance Volume\u003c\/strong\u003e: 0.9 gallon\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePressure Rating\u003c\/strong\u003e: 250 PSIG\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAir Charge (Factory Pre-Charged)\u003c\/strong\u003e: 55 PSIG\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Rating\u003c\/strong\u003e: 200 degrees F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInlet\/Outlet Connection\u003c\/strong\u003e: 3\/4 inch male threaded\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTank Dimensions\u003c\/strong\u003e: 10 inches diameter x 10 inches height\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTank Material\u003c\/strong\u003e: Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTank Inner Lining\u003c\/strong\u003e: Polypropylene\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiaphragm Type\u003c\/strong\u003e: Heavy-duty butyl\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Red oxide primer\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSystem Connection\u003c\/strong\u003e: Stainless steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSchrader Valve Seat\u003c\/strong\u003e: EPDM\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCertifications\u003c\/strong\u003e: ASME, NSF\/ANSI 61, ISO 9001:2008\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLead-Free\u003c\/strong\u003e: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTank Warranty\u003c\/strong\u003e: 1 year\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e: Inline\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e: Commercial closed, potable hot water system\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: AMTROLAMTRST5C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: AMTR-ST-5-C\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"AMTROL","offers":[{"title":"Default Title","offer_id":51525259428146,"sku":"AMTR-ST-5-C","price":1520.74,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/d68bb894c9366bcd734491eb753104e0.jpg?v=1785468701","url":"https:\/\/voomisupply.com\/products\/amtrolamtrst5c-amtr-st-5-c-thermal-expansion-tank-2-1-gal","provider":"Voomi Supply","version":"1.0","type":"link"}