| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an easily manufacturable heat pump water heater responding to even a case where necessary heating amount per unit time during reheating operation is large, without deteriorating reliability. <P>SOLUTION: The heat pump water heater 100 uses hot water stored in a hot water storage tank 15 as a heat source and can reheat, in a load side heat exchanger 25, hot water used in an external load facility, lowered in temperature. The heat pump water heater 100 includes: a circulation pipe line 20 for sequentially interconnecting the load side heat exchanger 25, a circulating pump 12, a heating heat exchanger 2 and the upper part of the hot water storage tank 15; and a first switching pipe line 16 and a second switching pipe line 17 having one ends connected to the lower part of the hot water storage tank 15. A first change-over valve 11 can change over flowing of hot water after used as a heat source in the load side heat exchanger 25 to the circulating pump side or flowing of low-temperature water within the first switching pipe line 16 to the circulating pump side, and a second change-over valve 13 can change over flowing of hot water within the circulation pipe line 20 to the heating heat exchanger side or to the second switching pipe line 17. <P>COPYRIGHT: (C)2010,JPO&INPIT |
