![]() HPWHs are primarily designed as alternatives or replacements for standard, electric resistance water heater tanks (ERWHs), but they should also be evaluated when oil or propane are the water heating fuels. While a HPWH is an efficient unit on its own, it does impact the surrounding area so the final determination of viability is dependent on the site conditions.Ī heat pump water heater (HPWH) is an efficient electric water heating option (Energy Factor ratings of greater than 2.0), but the actual operating efficiency of the unit is highly variable depending on several site specific factors. they use the heat pump whenever possible, but built-in controls switch to conventional resistance heating when there are large hot water needs. Most heat pumps operate as “hybrid” devices – i.e. A HPWH moves heat from the surrounding space into the hot water tank. A “heat pump” is a device that moves heat from one place to another.
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