| 摘要 |
PURPOSE:To furnish a solar heat water heater, in which the operation of a feed water valve is unnecessary, by a structure wherein the feed water valve, which starts to feed water only when the insolation or the daytime is detected. CONSTITUTION:A water level sensor 11 to detect the water level is connected through a controlling device 12 to a feed water valve 13. When an insolation sensor 10 detects the insolation and at the same time the water level sensor 11 detects a water level lying below the predetermined water level, the controlling device 12 opens the feed water valve 13. When evening comes and no insolation exists, the feed water valve 13 is closed. Consequently, no matter how much hot water is used, the mixing of cold water with hot water does not occur until when the insolation restores again or the following day. Immediately after the restoration of the insolation on the following day, the feed water valve is open so as to keep on feeding water until the water level sensor 11 detects the arrival of the predetermined water level. A twenty four hour timer 14 may be used instead of the insolation sensor 10. |
