| 摘要 |
PROBLEM TO BE SOLVED: To supply heat stably while ensuring energy saving in a hot water heater using an absorption heat pump. SOLUTION: When warm water temperature in a hot water storage tank 30 is at least a required warm water temperature, warm water in the hot water storage tank 30 goes around a second heater 10b and is supplied to a mixing water cock 75, and when the warm water temperature in the hot water storage tank 30 is less than the required warm water temperature, the warm water in the hot water tank 30 is heated with a second heater 10b, and is thereafter supplied to the mixing water cock 75. Hereby, the warm water at the required warm water temperature is supplied without raising the warm water temperature in the hot water storage tank 30 beyond the need by re-heating (additional boiling) in response to the required warm water temperature, so that compared with a case where warm water at highest temperature (e.g. 60 deg.C) required by a user is stored in the hot water storage tank 30, a heat amount for producing warm water can be reduced. Accordingly, warm water can be supplied stably while reducing a thrown heat amount (an amount of petroleum fuel) required for warm water production by recovering heat from fresh air. |
