| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform boiling-up operation without deteriorating heating efficiency (COP) to prevent depletion of hot water by increasing a stored hot water heat quantity upon completion of the boiling-up operation, even if medium temperature water is remained in a hot water storage tank. <P>SOLUTION: A controller is provided which if a stored hot water temperature sensor near a connection height of an intermediate return pipe detects temperature within a predetermined temperature range before a boiling-up operation start in a night time zone, switches a switcher to the intermediate return pipe side so as to return hot water heated by a heat pump type heater to a hot water storage tank intermediate part to perform boiling-up operation, and if the stored hot water temperature sensor near the connection height of the intermediate return pipe detects temperature out of the predetermined temperature range, switches the switcher to a hot water storage tank upper side so as to return hot water heated by the heat pump type heater to the hot water storage tank upper side to perform boiling-up operation. <P>COPYRIGHT: (C)2012,JPO&INPIT |
