| 摘要 |
A water heater comprised of a tank having a water reservoir defined therein. The tank has a water feed inlet and a hot water outlet. A first resistive heating element is disposed in an upper part portion of the reservoir to heat a first volume of water. A second heating element is disposed in a lower part of the reservoir for heating a larger volume of water. A still further heating element is disposed intermediate the first and second elements. Second and third resistive heating elements have power ratings which are much smaller than or equal to the first heating element to consume less electrical energy during high peak periods of the day and save on the demand of energy during those high peak demand periods of the day. An optical automatic control circuit controls the supply of the electric power to the second and third resistive heating elements to energize them during a predetermined time period of day outside the peak electrical demand hours, so as to cut down on the power demand by the water tank during any period of the day.
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