Electric Water Heaters  for residential and commercial should be installed with an Expansion Tank, a Brass Water Valve and a Relief Valve to a hot water heater pan or outside of the building.  Water piping should be copper piping, stainless steel or PEX A.  Braded Hoses cause electrolosis and cause the Heater to leak prematurely.

Hot water Heaters benefit from an Expansion tank. Why do I need it?  Every Hot water heater needs an expansion tank because of Thermal  Expansion.  Thermal Expansion occurs in your new Hot water Heater , Just like a car has an expansion tank for the radiator, when the fuild has reached its high temprature, it then fills into the expansion tank and when the water cools it goes back into the radiator, same occures in a water heater, expect the air pressure should match the house water pressure.

Water heaters that hold 50 gallons of cold water, it will expand to about 52 gallons when it is heated.

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