| 摘要 |
An electric water heater including a control unit, and a heating unit having a water container and an electric heating coil inside the water container and being controlled by a control unit, wherein a perforated heat-conductive cylinder is mounted inside the water container around the electric heating coil to separate the inside space of the water container into a heating chamber on the inside and a pre-heating chamber on the outside; a perforated heat-conductive collar is mounted around the cylinder to separate the pre-heating chamber into a primary pre-heating chamber at the bottom and a secondary pre-heating chamber at the top; the solid-state variable resistor of the control unit has a heat sink attached to a water accumulation chamber of the cold water pipe which guides cold water to the primary pre-heating chamber, which heat sink transmitting heat from the solid-state variable resistor to cold water in the water accumulation chamber.
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