| 摘要 |
<p>PROBLEM TO BE SOLVED: To heat up to hot water even if a scale is stored in circulating piping by operating a first heating means at the of reheating by using a daytime power, and controlling to operate a second heating means by using a midnight power at the time of normal heating up, thereby scarcely storing the scale. SOLUTION: In the hot water storage type water heater, a lower part of a hot water storage tank 1 is coupled to an upper part with circulating pipings 4, 5, hot water of high temperature is sequentially stored from the upper part of the tank 1 by operating a circulating pump 6 and a first heating means 7 provided on the way of the pipings 4, 5. In this case, a control means 13 for operating a second heating means 11 provided in the lower part of the tank 1 by midnight power and the operating the heating means 7 by daytime power is provided.</p> |
