Before checking any electrical parts of a water heater shut off the power to the heater s circuit by turning off the appropriate breaker in your home s service panel breaker box.
Thermostat hot water heater electric.
An electric water heater thermostat tells the heating elements when to heat up.
If the thermostats are okay you need to test the water heater elements.
The top element heats the water first and then the bottom element kicks in.
Most electric hot water tanks have two elements and two thermostats.
An electric water heater has one or two thermostats depending on the gallon size of the tank.
How electric water heater thermostats work.
Electric water heater thermostats are a fairly simple devices that can fail from time to time.
Many modern homes come with dual element water heaters.
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An electric hot water heater has two thermostats controlling two separate heating elements one in the upper half of the tank one in the lower half.
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The thermostats regulate the temperature of the water by turning off and on the heating elements.
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Usually when the upper thermostat goes bad you will have no hot water at all while a bad lower thermostat makes itself known when there is only a small amount of hot water before the tap water goes cold.
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Electric water heaters have one or two elements and each is controlled by a thermostat.
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Testing is the only option if you want to determine whether or not one or both of them has failed.
A dual element water heater uses two heating elements controlled.
You can test them with the power off using an ohmmeter to measure resistance or with the power on using a voltmeter to measure voltage.
How to set the upper and lower thermostats on dual element water heaters.
The elements do not heat up at the same time.