ELECTRIC HEATER EMPLOYING RADIATION FIN

PROBLEM TO BE SOLVED: To provide an electric hot-water heater which is small-sized as a whole and in which initial rise for starting radiation is quickened by heating a radiation fin in an extremely short time.SOLUTION: A radiation fin 7 is fixed around an outer peripheral surface of a heating copper pipe 6, a sheath heater 8 is inserted and installed within a heating chamber of the heating copper pipe 6, and silicone oil is injected into the heating chamber. Further, a front end of the heating copper pipe 6 is penetrated with a conduit 10, a proximal end opening part of the conduit 10 is disposed within the silicone oil, a soluble cock 13 is tightly fitted and fixed to a distal end opening part of the conduit 10, and a pressure sensor 14 is installed through the heating copper pipe 6. On the other hand, a radiation fin side limit switch 24 is fixed on the radiation fin 7, a heating copper pipe side limit switch 17 is installed in a glass shaft seal 16 and further, a thermostat is provided for controlling an indoor temperature.