| 摘要 |
<p>PURPOSE:To reduce radiation loss from a hot water storage tank and enable hot water supply which does not generate shortage in the quantity of hot water by varying the hot water temperature preset for boiling up in a hot water storage type hot water device is in inversely proportional to the quantity of remaining hot water of a hot water device using midnight power. CONSTITUTION:In a control device 15 for carrying out the ON-OFF control of a combustion device 13 by a remaining hot water quantity detecting signal from thermistors 12 provided separately by heights and a detection signal from a hot water temperature detector 7, water within the hot water device using midnight power is all hot water immediately after the boiling up in said device, and the quantity of remaining hot water is set to V1 and the predetermined temperature of hot water to t1 (e.g. 60 deg.C). When water supply is commenced, service water enters the device from the lower part of the hot water device 1 using midnight power, and hence hot water is pushed upward. Upon this occasion, if the remaining hot water quantity becomes V2, the predetermined temperature of hot water becomes t2 (e.g. 70 deg.C) and line V3, the set hot water temperature is increased to t3 (85 deg.C for this case). In this case, the predetermined temperature T of a hot water storage type hot water supplier is determined so that it is in inversely proportional to the remaining hot water quantity V of the hot water device 1 of midnight power.</p> |
