This potable water expansion tank is used on gas, oil or electric, direct-fired, residential water heater and hot water storage tank applications to absorb the increased volume of water created by thermal expansion. It also maintains balanced pressure throughout the water supply system by keeping system pressure below the T andP relief valve setting. This field-adjustable steel tank is air pre-charged at 20 psi volume 4.5 Gal. designed with an FDA-approved polypropylene liner and Butyl rubber diaphragm, copper-lined steel and 3/4 in. male inlet connection. An expansion membrane prevents air-to-water contact in the tank ensuring a long system life. IAPMO listed and ANSI/NSF 61 certified. The maximum pressure is 150 PSI (10 BAR).
Prevents over-pressure caused by thermal expansion
Air pre-charge at 20 psi
3/4 in. male connection
Butyl rubber diaphragm
Absorbs the increased volume of water created by thermal expansion
Prevents air-to-water contact in the tank
150 psi maximum pressure
Keeps system pressure below the T and P relief valve setting
Ensures long system life
Can be used in gas, oil, and residential heater/hot water applications
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Product Depth (in.)
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Universal Water Heaters
Steel Tank with an FDA-approved polypropylene liner and Butyl rubber diaphragm
Nominal Tank Capacity (gallons)
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Warranty / Certifications
Watts (the "Company") warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of original shipment. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge.
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