PROBLEM TO BE SOLVED: To ensure an improvement of installation by tankless arrangement and high efficiency hot water supply from a low flow rate to a high flow rate by ensuring cold/warm water supply and improving a rapid response of heat pump hot water supply. ;SOLUTION: When a heat pump unit 22 and a combustion unit 38 are simultaneously operated, and hot water is supplied to a terminal 48 through mixing means 37, hot water from a combustion unit is supplied to a heating section 44 provided around a compressor 23 for a predetermined time since initiation of hot water supply. Hereby, starting-up characteristics of the heat pump unit 22 are improved, and energy saving with respect to whole supply hot water energy is ensured by increasing actual use time.;COPYRIGHT: (C)2000,JPO
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