| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot water supply device using a heat pump for suppressing occurrence of hot water shortage.SOLUTION: A hot water storage tank 1 stores hot water heated by a heat pump 9. A first hot water supply passage 20 and a second hot water supply passage 35 each acquires the hot water stored in the hot water storage tank 1 from an upside of the hot water, and supplies the hot water. A first valve 21 is provided in the first hot water supply passage 20, and a second valve 31 is provided in the second hot water supply passage 35. When quantity of heat stored in the hot water storage tank 1 is lower than a first threshold value, one of the first valve 21 and the second valve 31 remains opened and the other is closed to execute heating processing with the heat pump 9. When the quantity of heat is lower than a second threshold value lower than the first threshold value, the first valve 21 and the second valve 31 are both closed. |
