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Harold Kestenholz.
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MasterPlumbers
Can someone explain how an electric hot water tank works.
Are both elements supossed to be on at the same time. -
The upper thermostat, when satisfied, opens the upper thermostat circuit and closes the lower thermostast circuit. The lower thermostat disconnects its own circuit. So they are not on at the same time, unless considering a special commercial water heater circuit. This limits the amount of electric current through the heater wires.
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