Thermal / hot water heater expansion tanks prevent hot water from back flowing into cold water line or from escaping through the pressure relief valve and onto the floor. Prevents constant fluctuations in water pressure that damage the heater and associated piping. National plumbing code mandates installation when a backflow preventer is present. All U.S. water heater manufacturers require the installation of an expansion tank in closed piping systems Accepts expanded water as system temperature rises due to thermal expansion and returns hot water to system when demand occurs Required by most building codes where backflow preventers are specified Prevents dripping faucets, intermittent toilet fill and pressure relief valve discharge Protects water heater, appliances and fixtures, prevents dangerous pressure buildup Eliminates wasted energy and water, save money and conserve water Butyl diaphragm for long life Deep drawn steel domes for maximum strength and pressure rating Rigid polypropylene liner for corrosion resistant reservoir Maximum operating temperature: 200°F, maximum working pressure: 150 psi. factory pre-charge: 40 psi Welded steel construction welded air charge fitting with protective cap for corrosion resistance and an air-tight seal Sizing - up to a 80 Gal. water heater Maximum operating temperature: 200°F, maximum working pressure: 150 psi, factory pre-charge: 40 psi System connection- 3/4 in. NPTM
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