| 摘要 |
<p>A heat pump water heater of instantaneous water heating type, comprising at least either of 1) a load setting part for setting a heating amount by a heat exchanger and a heating control part for controlling the heating amount according to the set value, 2) a heating part for heating water in front and rear routes including the water flow passage of the heat exchanger, 3) a plurality of compressors, and 4) a plurality of heat pump cycles, wherein city water is passed directly in the water flow passage of the heat exchanger exchanging heat between a refrigerant flow passage and the water flow passage and hot water delivered from the water flow passage is put in use, whereby the rise of water temperature at the start of hot water supply can be increased and also a controllability and an efficiency can be improved.</p> |
