There is one sure way of doing that which i have explained in detail below.
Gas water heater thermostat test.
You can find this information on the data tag on the side of the water heater.
Sounds like the thermostat is not turning off which requires heat which clogged and corroded elements have difficulty delivering.
If you have done the entire process of testing the thermostat replacing it is just the next step.
Testing water heater thermostats is important in locating water heater problems.
When shopping for a water heater thermostat you need to know how many elements the water heater has and the voltage.
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.
More likely clogged corroded elements.
When it goes bad you don t have any hot water at all.
Setting and adjusting the hot water heater thermostat is all about the gas valve which lets gas in through the bottom burner.
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You know when your shower spits ice cubes instead of hot water that it s time to replace the thermostat for your water heater.
When you check your electric water heater you will notice two thermostats on the unit one at the top and one at the bottom.
As soon as you complete this task you can fix it.
However you will need to know how to test a water heater thermostat to find the faulty unit.
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For thermostats on gas hot water heaters you will need to see the article gas.
If the data tag is missing you can identify single element vs dual element by the number of access panels on the water heater.
Before you head out to buy a brand new thermostat you should find out if the one on your water heater is broken beyond repair or not.
Learn about using a thermistor.
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This article deals with thermostats on electric water heaters.