HEAT PUMP WATER HEATER

摘要

PURPOSE:To achieve higher operation efficiency by securing the controllability of the temperature in the inflow of hot water into a hot water storage tank and the reliability of the apparatus. CONSTITUTION:A second hot water delivery circuit 16 is provided to a hot water delivery circuit 10 bypassing an auxiliary heater 9 through a solenoid valve 17 from an outlet of a heat exchanger 2 for hot water and a controller 18 is provided to close the solenoid valve 17 in the operation combining a heat pump and the auxiliary heater 9 and in the operation using the auxiliary heater 9 singly and to open it 17 in the operation using the heat pump singly. A control is performed as follow; the solenoid valve 17 is opened in the heat pump-oriented operation to run hot water to the second hot water delivery circuit 16 and when the temperature detected of a water temperature detector 11 rises to reach a first set value, the heat pump is stopped. The solenoid valve 17 is closed while the auxiliary heater 9 is turned ON and a switching is made over to the heat pump-oriented operation as the temperature detected of the water temperature detector 11 lowers with the delivery of hot water or the like while the solenoid valve 17 is opened.