Hot water produced by heating by means of a heat pump unit (1) is stored in a hot water storage tank (2). A hot water supplying heat exchanger (3) in which hot water to be supplied flows from below upward in the heat exchanger (3) is provided in the hot water storage tank (2). An intermediate section of the hot water supplying heat exchanger (3) in the top-bottom direction is connected to a second hot water supply connection opening (18) in the hot water storage tank (2). The configuration allows hot water to be supplied which flows from the lower part of the hot water supplying heat exchanger (3) up to the intermediate section to be taken out of the hot water supply tank (2) from the second hot water supply connection opening (18).
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