| 摘要 |
PURPOSE:To equalize the temperatures of the inner and outer surfaces of a heating element substantially to restrict generation of scale and improve the heat efficiency of the heater by a method wherein a heat dissipating member is provided on the heat dissipating surface of the heating element while a turbulent flow generating means, corssing with the heat dissipating member, is provided in a heating flow path. CONSTITUTION:The inner heating pipe line 7 of a cylindrical heating element 1, constituted by pinching a heating resistor 4 between ceramic base members 2, 3, is communicated with a hot-water outlet 9, a metallic layer 5 is formed at the outer periphery of the heating element 1, and a heat dissipating member 6 is provided thereon by welding spiral copper wires. Grooves 13 parallel to the axis of the cylinder are formed on the inner peripheral surface of an outer case 10 forming the heating flow path 11 around the outer periphery of the heating element 1, so as to utilize them as a turbulent flow generating means. |
