| 摘要 |
PURPOSE:To eliminate a cord wiring and reduce an electric consumption by providing a temperature sensor in a heater so that a temperature of water in a bathtub can be detected. CONSTITUTION:A delay switch 7 which consists of a bimetal 20, insulators 18 and 23 and a switch plate 24 is provided in a heater 1. By taking notice of a fact that radiation from warm water in a bathtub depends on a temperature difference between temperatures of the warm water in the bathtub and the atmosphere, the delay switch 7 which varies a delaying time according to the atmospheric temperature is provided on a spot where an operation of a pump is instructed and the switch is made to actuate heating further only when the pump is in operation, then a change of a radiation quantity resulting from a change of an atmospheric temperature is canceled out, and a temperature difference between temperatures of the warm water in the bathtub at times of heating and stoppage can be made as small as possible. |
