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Thermostat hot water heater electric.
If the hot water heater is not working one of the thermostats may be bad.
If the thermostats are okay you need to test the water heater elements.
The thermostats regulate the temperature of the water by turning off and on the heating elements.
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Testing is the only option if you want to determine whether or not one or both of them has failed.
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.
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.
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Most electric hot water tanks have two elements and two thermostats.
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How electric water heater thermostats work.
Electric water heaters are high voltage 240 volt appliances that are dangerous to work with when the power is on.
Many modern homes come with dual element water heaters.
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.
How to set the upper and lower thermostats on dual element water heaters.
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Electric water heater thermostats are a fairly simple devices that can fail from time to time.
An electric water heater has one or two thermostats depending on the gallon size of the tank.
An electric water heater thermostat tells the heating elements when to heat up.
The top element heats the water first and then the bottom element kicks in.
Electric water heaters have one or two elements and each is controlled by a thermostat.