| 摘要 |
<P>PROBLEM TO BE SOLVED: To avoid a situation where the temperature of hot water in a storage tank becomes low when a normal operation restarts after the completion of a defrosting process without consuming a large quantity of hot water to be discharged. <P>SOLUTION: A storage water heater 1 comprises a heat pump unit 3, a hot water storage tank 2, a circulation pump 4, and a control unit 6 which performs a defrosting operation for removing frost attached to an air-to-air heat exchanger 31 as well as controlling the operations of the heat pump unit 3 and the circulation pump 4, and the hot water storage tank 2 is connected to a water-to-water heat exchanger 33 through the water inlet pipe 12 and a hot water supply pipe 13, and hot water Wh in a storage space A can be supplied from a hot water supply port 24 by a water supply pressure of water Wc supplied from a water supply port 21 into the water storage space A, and a water discharge valve 5 for discharging the water Wc or the hot water Wh in the water inlet pipe 12 according to control by the control unit 6 is provided in the water inlet pipe 12, and the control unit 6 makes the water Wc or the hot water Wh discharge by controlling the water discharge valve 5 when the defrosting process is complete. <P>COPYRIGHT: (C)2012,JPO&INPIT |
