ELECTRIC WATER HEATER, LIQUID HEATER, STEAM GENERATOR

摘要

An electric water heater, a liquid heater, and a steam generator, wherein the heating wall (2) of a fluid vessel (1) containing water or liquid therein is heated by a heating coil (6) which is formed from a thin − as long as it is self−supporting in shape − and high−electric−resistance metal sheet such as iron and chromium, an electric insulator (5) interposed between the heating wall (2) and the heating coil has a thermal conductivity, of such as aluminum nitride, more than three times higher than that of the heating coil, the heating wall has a thermal conductivity, of such as copper and silver, more than 10 times higher than that of the heating coil, and these components are set to be mutually in close contact in terms of thermal conduction. Accordingly, heating by the heating coil (6) immediately transfers to the heating wall (2) to start feeding water and liquid that has been heated in several seconds, and, in addition, an energy−saving power supply circuit almost free from cold water is available by separately providing a switch turned on several seconds earlier and based on this quick heating.