| 摘要 |
PURPOSE: To prevent energizing to a heater from being performed if the assembly of a float unit is forgotten or the like. CONSTITUTION: The heater 19 for heating is arranged inside a hot water tank. Also, the float unit provided with a float vertically moved by a water level inside the tank and a working arm linked with the float is incorporated in the hot water tank. The working arm is attached and detached to/from the microswitch 22 of a normally closed type attached to the outer surface of the hot water tank. In the meantime, a spring piece 34 for normally turning the contact point of the microswitch 22 to an open state is provided on the outer surface of the hot water tank and the spring piece 34 is saved to a position away from the microswitch 22 by the incorporation of the float unit. |
