| 摘要 |
An electric water heater for heating a first volume of water for domestic use and a second volume of water for space heating includes a tank receiving water to be heated for domestic use by a first electric heating element mounted in a lower part of the tank. A heating unit is mounted within the mid-section of the tank above the first heating element and includes a first chamber having openings allowing circulation of domestic use water from the tank therethrough, a second closed chamber receiving water to be heated for space heating and a third closed chamber communicating with the second chamber and having an outlet for supplying heated water to a space heating system. A second electric heating element is provided in the first chamber and the second chamber is defined by a series of serially connected compartments, each having a heat conducting element comprising an inverted U-shaped hollow tube in heat collecting communication with the first chamber. A third electric heating element is provided in the third chamber. The tank has an outlet for supplying heated water for domestic use.
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