| 摘要 |
This aims to provide a heat-pump hot-water supply apparatus for enhancing an energy efficiency at a hot-water tank boiling time for a midnight time period and for leveling a demand for an electric power. The heat-pump hot-water supply apparatus comprises a heat pump and a hot-water tank for reserving the water heated by the heat pump. The heat-pump hot-water supply apparatus further comprises setting means for setting a heating ability by using the ambient temperature, and control means for running the heat pump preferentially at the minimum of the heating ability set for the midnight time period by the setting means. The control means exercises control to run the heat pump with a heating ability higher than the minimum, if the boil cannot be completed for the midnight time period even by the preferential run of the heat pump with the minimum heating ability. |
