Patent ID: 7234646

Claim:
A heat pump hot-water supply system, comprising: a heat pump circuit comprising a compressor, first heat exchanger for heat-exchange between a refrigerant discharged from the compressor and water withdrawn from a running water pipe, pressure reducing unit for reducing the pressure of the refrigerant from the first heat exchanger, second heat exchanger located between the pressure reducing unit and the compressor; a controller that controls a speed of the compressor based on a temperature of water heat-exchanged with the refrigerant in the first heat exchanger; a hot-water supply tank for holding hot water; a direct hot-water supply route which can supply hot water directly from the water supply pipe to a using end unit via the first heat exchanger; tank supply route which can supply hot water to the using end unit by mixing water from the first heat exchanger with hot water collected in the hot-water supply tank via a first mixing unit; and a bypass supply route which can supply water that has bypassed the first heat exchanger and the hot-water supply tank from the water supply pipe to a position downstream of the first mixing unit via a second mixing unit.