| 摘要 |
<p>PURPOSE:To provide the titled device with the capability of automatically changing its preset temperature such that a heating-up temperature may be kept at lower level while a hot water is not fed and be increased during the feed of hot water, by providing a hot water outlet and the like with a detecting device adapted to detect whether the hot water is being fed or not interlinkingly with a hot water temperature sensor. CONSTITUTION:A hot water pipe 12 is connected with a body 11 and also with a hot water port 10. A flow switch 13 is provided at a part of hot water feed pipe 12 as a detecting device adapted to detect whether a hot water is being fed or not in response to the pressure difference of hot water, and the flow switch 13 is electrically connected with a hot water temperature sensor 8 and the control device of hot water feed device. Upon the feed of hot water being stopped, the device stops burning at around a preset lower temperature of hot water temperature sensor 8 and then starts after-heating. When the feed of hot water is restarted, the preset temperature of sensor is changed to a lower level. With the stop of hot water feed, the device stops burning. After re-combustion, the burning operation of device is stopped at a lower preset temperature and repeats its similar operations successively.</p> |
