To provide a heat pump water heater capable of achieving high efficiency of a heat pump cycle by effectively using intermediate temperature water within a hot water storage tank for the heat pump cycle directly.
The heat pump water heater includes: a refrigerant circuit 20 comprising a compressor 16, a radiator 17, a decompression means 18 and an evaporator 19; and the hot water storage tank 15 for storing hot water heated by the radiator 17. Heat exchange is performed between hot water in an intermediate temperature region within the hot water storage tank 15 and a refrigerant made to flow within the evaporator 19. The intermediate temperature heating with low efficiency of a heat pump can be reduced. Since intermediate temperature water can be effectively used for the heat pump cycle directly, system efficiency for storing hot water can be improved.
WATANABE TAKEJI
Daisuke Nagano
Kentaro Fujii