| 摘要 |
<p>PURPOSE:To efficiently perform heating by disposing a lower heater on the bottom of a heating tank and an upper heater at the upper part so that the heating may be performed by the upper heater when hot water is to be supplied immediately after starting the heating, and, in the case of hot water supply after heating the entire water body in the heating tank, the heating may be first performed by the upper heater which is followed by the lower heater after the hot water temperature in the upper part reaches a predetermined temperature. CONSTITUTION:Hot water is delivered from the upper part of a heating tank through a delivery pipe 8, and water 6 is fed to the lower part of the heating tank 1 through a feed pipe 9. A lower heater 3 is disposed on the bottom of the heating tank 1, and an upper heater 2 in the upper part of the heating tank 1. In the case where hot water 5 is to be delivered immediately after starting the heating, the upper heater 2 performs the high temperature heating. In the case where hot water is to be delivered after the entire water body in the heating tank 1 is heated to a high temperature, the heating is first performed by the upper heater 2 which, after the hot water temperature became high, is followed by the heating by the lower heater 3. In the case where low temperature warm water 7 is to be delivered immediately after starting the heating, the upper part is heated to a low temperature. When the entire water body in the heating tank 1 is to be maintained at a warm temperature, the upper heater 2 first heats up to such a temperature, which is followed by the warming of the entire heatimg tank 1 by the lower heater 3.</p> |
