![]() Tank is filled with cold water - only the top thermostat is sending power to the top element.Since the majority of residential water heaters have non simultaneous thermostats I'll go over how they operate. Dual thermostat water heaters will either be wired to operate both thermostats simultaneously or non-simultaneously, which means that the upper thermostat will be satisfied first before allowing the lower thermostat to control the lower element. Once the water temperature satisfies the thermostat's call for heat, it cuts power to the element. Thermostats operate by sensing the temperature inside the tank and if below the temperature setting, they send power through the element, heating the water. ![]() How a thermostat works The temperature inside your water heater is controlled by a thermostat, and most residential water heaters are dual thermostat units. ![]()
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