| 摘要 |
<p>PURPOSE:To suppress residual hot water quantity to the minimum to improve apparatus efficiency and to save energy by detecting the heating time and operating the value of heating-up set temperature to control a heater, based on the detected heating time. CONSTITUTION:The titled device is provided with a controller 6 for controlling the operations of a heater 1 and a timer 4 as heating time detecting means, by output signals from a hot water temperature sensor 3 as hot water detecting means and an arithmetic unit 5 for computing the heating-up set temperature based on the heating time. After starting the operation, when the hot water temperature reaches a heating-up set temperature, a heater control circuit 8 causes the operation of the heater 1 to stop and, at the same time, the timer 4 stops to count the heating time. This heating time is inputted into the arithmetic unit 5, which computes the heating up set temperature on the following day to replace the initial temperature with the heating-up set temperature thus computed. Thereafter, the abve described operation is repeated every day by the computed heating up set temperature.</p> |
