| 摘要 |
A water heater comprising a water tank and an electric resistance heating element extending into the water tank for heating water in the tank, including a proportional band temperature controller for conducting electric power to the electric resistance heating element in bursts, each burst of electric power followed by a period during which the temperature controller does not conduct power to the electric resistance heating element, wherein, each burst of electric power comprises about 95% or less of a cycle comprised of one burst of electric power followed by the period during which the temperature controller does not conduct electric power.
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