Patent ID: 7021073

Claim:
A heat pump hot water supply system of a hot water storage type, comprising: a hot water tank ( 1 ) for storing therein the hot water to be supplied; a circulation water path ( 16 ) for sending the water in the lower inner part of said hot water tank ( 1 ) to the upper inner part of said hot water tank ( 1 ); a heat pump unit ( 2 ) arranged in said circulation water path ( 16 ) to heat the water flowing said the circulation water path ( 16 ) to high-temperature hot water; a high-temperature hot water path ( 12 ) led out from the upper part of said hot water tank ( 1 ) to supply the high-temperature hot water to an external device from the upper inner part of said hot water tank ( 1 ) whenever required by said external device; a water supply path ( 11 ) for replenishing water to the lower inner part of said hot water tank ( 1 ) when the hot water in said hot water tank ( 1 ) is supplied to the external device through said hot water path ( 12 ); a plurality of stored hot water temperature detection means ( 21 a to 21 e ) arranged along the height of said hot water tank ( 1 ) to detect the amount and temperature of the hot water stored in said hot water tank ( 1 ); and a control means ( 22 ) for controlling the operation of said components, wherein in the case where the water in the lower inner part of said hot water tank ( 1 ) is heated up by said heat pump unit ( 2 ), said control means ( 22 ) stops said heat-up operation while leaving the hot water in an amount equivalent to the residual hot water capacity (W 1 ) in said hot water tank ( 1 ) detected by said hot water temperature detection means ( 21 a to 21 e ).