| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot water storing type hot water supply device capable of reducing an operation cost. SOLUTION: A partial amount of water within a hot water storing tank 1 is boiled up by a heat pump in such a way that a temperature of water at a middle stage in a hot water storing tank 1 detected by a thermistor Rth1 may become a set temperature when an operation time belongs to a time zone of a high charge rate of electricity. In turn, a total amount of water within the hot water storing tank 1 is boiled up by the heat pump in such a way that a temperature of water at a low stage in the hot water storing tank 1 detected by a thermistor Rth2 may become a set temperature when an operation time belongs to a time zone of a low charge rate of electricity. |
