| 摘要 |
A compact and fast acting tankless heater has an elongated tubular casing having water inlet and outlet conduits at opposite ends. A elongated generally helically twisted inner tube is disposed coaxially within the casing to define helical channel means between the tube and casing for conducting water longitudinally from the casing inlet to the casing outlet. The inner tube has a water inlet at one end communicating with the water inlet of the casing and the other end of the tube is closed. An elongated electric heating means is disposed within the inner tube for heating the water therein. The inner tube has a plurality of longitudinally spaced openings for conducting hot water and steam from the inner tube into the helical channel means to combine with the water flowing through the helical channel means from the casing inlet to the casing outlet. An additional electric heater sleeve can be provided to surround the exterior of the casing.
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