| 摘要 |
PURPOSE:To prevent the heater from overheating in response to the change in the feed water pressure when the unit is being used, and to maintain the temperature of the discharged hot water at a set value by making a temperature sensor of a water heater in a water-tight manner along a bearing which is watertightly fastened to the water heater tank, and pressing the sensor to the heater side by a spring all the time. CONSTITUTION:When a valve 11 is opened, water pressure is applied to a pressure switch 12 to turn it ON, and the water coming from a feed water pipe 4 is heated and discharged from a hot water discharge pipe 5 at the bottom of a tank 2. At this time, due to the change in the tap water pressure and the degree of opening of the valve 11, the pressure in the tank 2 may change and the tank 2 may expand and contacts. At this time, the distance from the surface of a sheathed heater 1 to the inner surface of the tank 2 can also change, but as a temperature sensor 6 is always pressed toward the sheathed heater 1, the temperature sensing part 6a is always in contact with the surface of the sheathed heater 1. Therefore, the overheating of the sheathed heater 1 can be prevented, and the temperature of the discharged hot water the set temperature. |
