| 摘要 |
<p>PROBLEM TO BE SOLVED: To supply hot water at a stable temperature without destroying the temperature stratification of a hot water storage tank. SOLUTION: When hot water is to be stored by a heat pump, the temperature of the upper portion of a hot water storage tank 2 is detected by a thermistor 19, a circulation pump 4 is driven for introducing the hot water in the hot water storage tank 2 from a lower inlet 3a when the detection temperature is equal to or more than the boil-up temperature, heat exchange is made between water and a refrigerant heat exchanger 5, and reflux is made to a reflux port 3c at a lower position than an electric heater 6 of the hot water storage tank 2 via a three-way valve 18 for storage.</p> |
