How To Replace Water Heater Thermostat?

If your thermostat is misbehaving, don’t worry, we’re here to guide you on how to replace water heater thermostat which may seem like an intimidating task, but it is actually quite simple.

With the right tools and some basic knowledge of electrical systems, anyone can replace their water heater’s thermostat in no time.

In this guide, we will walk you through the steps needed to safely and successfully replace your water heater’s thermostat. So let’s get started!

Before you begin, make sure you have the right tools and materials on hand.

You will need a flat-head screwdriver, adjustable wrench, voltage meter or multimeter, replacement thermostat, and any other necessary items per the instructions of your specific water heater model.

Once you have all the needed supplies you are ready to go.

Here’s How to Replace Water Heater Thermostat

how to replace water heater thermostat

  • Step 1: Kill the power

Turn off the power to your water heater. Shutting off the power will help ensure that you don’t shock yourself while working. Make sure that there aren’t any other electrical devices plugged into nearby outlets as this could still give you an electric shock when working.

  • Step 2: Locate the unit

Locate your water heater’s thermostat. Depending on the model of your water heater, this may be in a different location. It should be located directly behind the cover panel.

Carefully remove this cover by unscrewing it with a flat-head screwdriver. This will reveal any wires connecting to your thermostat; make sure not to touch these wires as they are live and can cause injury if handled incorrectly.

  • Step 3: Disassemble the assembly

Now that you can see the thermostat assembly, use an adjustable wrench to loosen and remove any mounting screws that hold it in place in order to detach it from its housing.

After removing the screws, carefully lift out the old thermostat and discard it safely away from children and pets as it may contain hazardous materials within its components such as mercury or lead solder.

  • Step 4: Replace with a new water heater thermostat

Once you have disposed of your old thermostat safely, take out your new one and compare its size with that of the old one in order to make sure they match up correctly before installation begins.

If everything looks good then proceed by attaching all wiring connections exactly how they were attached on the previous unit ensuring that each wire has been tightened properly for a secure connection before proceeding further down with the installation steps.

  • Step 5: Double check the connections

After making sure that each connection has been made correctly double check with a voltage meter or multimeter before inserting the new thermostat into its housing slot and tightening down all mounting screws securely using an adjustable wrench once again for added stability.

  • Step 6: Turn the power back on

Once your new thermostat has been installed and all connections are secure, re-attach the cover panel with a flat-head screwdriver.

You can now turn the power back on to your water heater and let it run a few cycles to ensure that everything is working properly.

If you experience any issues after installation, contact an experienced local electrician or plumber for help diagnosing and resolving any problems.

Recommended Read: how to test water heater element

Testing a water heater element is important to assess performance, ensure energy efficiency, maintain safety, extend lifespan, and preserve water quality.

  • Step 7: Reset

lastly, reset the power of the boiler thermostat by first referring to the instruction manual to set the thermostat to the recommended temperature settings.

Ensure the that the water tank is filled and turn the power back on at the control board. Press the red button on the thermostat for reset.

how to replace a water heater thermostat


Now if you’re reading this, congratulations! You have completed this guide and you are now armed with the basic know-how on how to replace water heater thermostat. Enjoy hot water again in no time!

Remember to prioritize safety by turning off the power and ensuring the water heater is completely cool before starting. Take note of the specific thermostat type and temperature settings for your water heater, as this will guide your replacement process.

Additionally, pay attention to the wiring connections and take pictures beforehand to assist with reassembly. Regular maintenance and replacement of your water heater thermostat are essential for optimal performance and energy efficiency.

So, whether you’re experiencing temperature inconsistencies or simply want to upgrade to a newer model, don’t hesitate to put this valuable skill into practice.

By following these easy steps, replacing your water heater’s thermostat should be a breeze. If you ever need to replace it again in the future, now you know how! Good luck and happy DIY-ing!

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