| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve night-time boiling-up efficiency while controlling production of hot water of intermediate temperature in a hot water storage tank in reheating a bath, and securing the amount of hot water in the hot water storage tank during the reheating. <P>SOLUTION: A pathway for circulating water through a heat pump 3, a second circulation passage 11b, a hot water circulation passage 24, a first switch valve 21 and a first circulation passage 11a without passing through the hot water storage tank 1, is used when the heat pump 3 is stabled with prescribed capacity and prescribed temperature. A circulation pathway for returning the hot water of intermediate temperature after heat exchange by an external heat exchanger 25 to a heat pump 3 side without returning to the hot water storage tank 1, is used in a reheating operation. As the hot water of intermediate temperature, of which the temperature is lowered by the reheating operation does not flow into the hot water storage tank 1, the hot water of intermediate temperature is not produced in the hot water storage tank 1. <P>COPYRIGHT: (C)2007,JPO&INPIT |
