HOT WATER STORAGE TYPE WATER HEATER

PROBLEM TO BE SOLVED: To suppress deposition of scale on a secondary side of a heat exchanger for hot water supply and to preferably maintain heat conduction efficiency and a hot water supply flow rate of the heat exchanger for hot water supply for a long period of time.SOLUTION: A heat pump type water heater includes: a heat pump unit 1; a hot water storage tank 8; a control unit 9; an outgoing pipeline 11 for water heating; a return pipeline 12 for water heating; a flow passage switching valve 13; a heat exchanger 16 for hot water supply; and a remote controller 40 and the like. The control unit 9 can execute both a heating utilization hot water supply operation for heating water by the heat exchanger 16 for hot water supply with heating hot water from the heat pump unit 1 as a heat source, and a stored hot water utilization hot water supply operation for heating water by the heat exchanger 16 for hot water supply with stored hot water from the hot water storage tank 8 as the heat source. Also, the control unit 9, by controlling the flow passage switching valve 13 when performing hot water supply, switches which hot water is introduced to a primary side flow passage of the heat exchanger 16 for hot water supply out of the heating hot water and the stored hot water, based on a target hot water supply temperature.SELECTED DRAWING: Figure 1 【課題】給湯用熱交換器の２次側にスケールが付着するのを抑制し、給湯用熱交換器の熱伝導効率及び給湯流量を長期間にわたって良好に維持する。【解決手段】ヒートポンプ式給湯機は、ヒートポンプユニット１、貯湯タンク８、制御部９、水加熱用往き配管１１、水加熱用戻り配管１２、流路切換弁１３、給湯用熱交換器１６、リモコン４０等を備える。制御部９は、ヒートポンプユニット１からの加熱温水を熱源として給湯用熱交換器１６により水を加熱する加熱利用給湯運転と、貯湯タンク８からの貯湯温水を熱源として給湯用熱交換器１６により水を加熱する貯湯利用給湯運転とを実行可能とする。また、制御部９は、給湯を行うときに、流路切換弁１３を制御することにより、加熱温水と貯湯温水のうち何れの温水を給湯用熱交換器１６の１次側流路に導入するかを目標給湯温度に基いて切換える。【選択図】図１