Patent ID: 7454919

Claim:
A hot-water supply apparatus, which has a heat pump refrigeration cycle having a compressor, a water-heat exchanger and an outdoor heat exchanger, and stores hot water in a hot-water tank by circulating water of a hot-water tank through a water-heat exchanger by operating a pump, comprising: a control section of a defrosting operation using hot water, which causes refrigerant discharged from the compressor to flow to the outdoor heat exchanger, and returns the refrigerant passed through the outdoor heat exchanger to the compressor through the water-heat exchanger, while operating the pump; a control section of a quick defrosting operation, which causes refrigerant discharged from the compressor to flow to the outdoor heat exchanger, and returns the refrigerant passed through the outdoor heat exchanger directly to the compressor, while stopping the pump; a temperature sensor which detects the temperature of water that has flowed into the water-heat exchanger, and a control section for temperature control, which selectively executes the defrosting operation using hot water, and quick defrosting operation, according to the temperature detected by the temperature sensor.