| 摘要 |
<p>PURPOSE:To reduce the number of times of turning ON and OFF of a hot water maker and make it difficult to develop overshooting of the hot water by providing a hot water storage tank which is provided with a heater in an intermediate position of its return pipe and insulating the hot water in a circulation channel with a hot water maker and electric heater. CONSTITUTION:When a detected temperature is lower than a set temperature TS of a remote controller, the burner 24 of a first hot water maker 2 is burned if the temperature deviation is larger than a first deviation. Accordingly, the hot water in circulation is heated by a electric heater 10 and first hot water maker 2. If the temperature deviation between the detected temperature by a temperature sensor 14 and a set temperature is smaller than a second deviation, the combustion of the burner 24 is stopped and later on the electric heater 10 only is used for the heating. When the temperature sensor 14 detects temperature lower than the set temperature TS, the electric current to the electric heater 10 is stopped. Furthermore, if it continues to detect temperature higher than the set temperature TS for a certain time, a circulation pump 9 is also stopped.</p> |
