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Their field and laboratory tests showed that HPWHs use about half the energy to heat domestic hot water when compared to an electric resistance water heater (Levins 1982).
The organization has evaluated the inclusion of electric resistance technologies into the program and determined that, although there may be slight initial savings to be attained, there are few, if any, technology improvements possible with this form of water heating to warrant the long-term qualification of electric resistance water heaters in the program.
For cost, noise, air movement, and other reasons, the heat pump heating rates are relatively small at less than 10,000 Btu/hr (3 kW), relative to comparable gas-fired and electric resistance water heaters.