| 摘要 |
PROBLEM TO BE SOLVED: To reheat hot water delivered from a hot water storage tank by an inexpensive auxiliary heat source device.SOLUTION: An inlet side of a hot water supply circuit 35 of a water heater 8 including the hot water supply circuit 35 having a hot water supply function to one or more hot water supply destinations, is connected to a hot water delivery passage 62 of a tank unit 60 including the hot water storage tank 2. The hot water supply circuit 35 is provided with a hot water supply heat exchanger to further heat the hot water delivered through the hot water delivery passage 62 from the hot water storage tank 2 by the hot water supply heat exchanger, and to supply the hot water to the hot water supply destinations. The water heater 8 is provided with a liquid circulation pump 6 for circulating a liquid of a heat medium, and a heat exchanger for heating a circulated heat medium, to heat a liquid circulated by the liquid circulation pump 6. An intermediate portion of the liquid circulation passage 5 is thermally connected to an upstream side with respect to a connecting portion with the hot water supply circuit 35, of the hot water delivery passage 62 through a liquid-liquid heat exchanger 14, and the hot water is heated by the heat exchange between the heated heat medium passing through the liquid circulation passage 5 and the hot water passing through the hot water delivery passage 62. |
