How to test replace a water heater thermostat fast!?

Your water heater is probably the last thing you want to deal with when it comes to home maintenance. Luckily, you don’t have to worry about replacing your thermostat anymore.

The new generation of smart thermostats can automate heating and cooling cycles, adjust temperature settings and even turn off or reset your system remotely. Thermostats are devices that control the heat inside your home.

They usually consist of two parts: a sensor that detects the temperature inside your house and a display unit that shows the current temperature. Thermostats vary in size, shape, and price, depending on their features and functions.

You can now install a smart thermostat in your home that helps you save energy and money. Smart thermostats can also help you optimize the comfort level in your home, while providing remote access to your HVAC system.

Having a water heater thermostat installed is essential for keeping your home comfortable during cold weather. If you don’t have one, or if yours has stopped working, it can cost you hundreds of dollars in repairs.

A properly functioning thermostat helps regulate the temperature inside your house. This keeps your pipes from freezing and saves energy costs.

However, it’s important to remember that a thermostat isn’t designed to last forever. In some cases, they fail after only a few years. That’s why it’s crucial to test and replace them regularly.

How To Test & Replace A Water Heater Thermostat Fast!

If you’re having trouble finding a replacement water heater thermostat, here are some tips for testing and replacing them yourself.

Step 1: Turn Off The Power Supply

Before you start, make sure that there’s no power going into the wall socket where your water heater is plugged in. You should be able to shut down the breaker panel by flipping the switch at the top right corner of the panel.

Step 2: Disconnect The Water Line

Turn off the main valve located near the bottom of your tank. Then disconnect the faucet line from the valve.

Step 3: Remove The Cover From The Tank

Turn off the gas supply valve located near the bottom left side of the tank. Next, remove the cover from the top of the tank.

Step 4: Check For Leaks

Look around the base of the tank for leaks. Make sure that all connections are tight. Also check the pipe joints for cracks.

Step 5: Clean Out The Drain Pipe

Use a drain snake to clean out any debris that may be clogging up the drainpipe.

Step 6: Reinstall The Faucet Line

Reattach the faucet line to the valve. Turn on the gas supply valve again.

Step 7: Connect The New Thermostat

Replace the old thermostat with the new one. Plug it in and wait until the device starts warming up.

Step 8: Reset The System

Once everything is warm and ready, press the “reset” button on the back of the thermostat. It will automatically cycle through the different temperatures available.

Step 9: Turn On The Gas Valve

Once everything is set, turn on the gas valve. Wait for the pilot light to come on before turning on the gas valve.

Step 10: Adjust The Temperature

Now adjust the temperature dials on the thermostat to match what you want.

How do I know if my water heater thermostat is bad?

You might not even realize that your thermostat is broken unless something goes wrong. Here are some signs that indicate that your thermostat needs repair:

1) Your water heater won’t heat up when you turn on the hot water tap.

2) When you turn on the hot-water tap, the water comes out lukewarm.

3) After several days, the water in the tank stops heating up.

4) The water heater doesn’t keep the temperature steady.

5) The temperature gauge on the thermostat shows an incorrect temperature.

How long should a hot water thermostat last?

A typical hot water thermostat lasts about five years. However, if you live in an area where the average temperature changes frequently, then you might need to change it more often than once every five years.

Also, if you live in a cold climate, then you may not have to worry about changing the thermostat at all.

How much does it cost to replace a water heater thermostat?

The price of replacing a water heater thermostats depends on what type of thermostat you are replacing. Typically, they range anywhere from $30 to $100.

However, if you decide to purchase a new unit, then you’ll pay around $200.

How do you replace a hot water heater thermo-stat?

There are many ways to test a hot water heater thermometer. Some people use a digital thermometer while others prefer using a mercury thermometer.

Here are two methods to test a hot water thermostatic valve:

Method 1 – Digital Thermometer

Digital thermometers are very accurate and easy to read. They also can be used to check other parts of the home as well.

To test a hot water thermo-stat, first disconnect the gas line and remove the cap from the top of the valve. Then, place the probe into the tank. Once the reading has stabilized, record the number.

Next, reconnect the gas line and reinsert the cap. You can now turn on the gas and see how the temperature rises. If it takes longer than 15 minutes to reach the desired temperature, then there’s probably a problem with the thermostat.

If the temperature stays constant or drops after 15 minutes, then there’s probably nothing wrong with the thermostat itself.

Method 2 – Mercury Thermometer

Mercury thermometers are inexpensive but not as accurate as digital thermometers. They’re also difficult to read because the liquid inside them is opaque.

To test a thermostat, simply insert the thermometer into the tank until it reaches the desired temperature. Record the reading.

Once the reading has been recorded, remove the thermometer and wait 30 seconds. Turn off the gas and remove the cap. Now, insert the thermometer again and record the temperature. Compare the readings.

If the temperatures are different, then there’s probably something wrong with the thermostatic valve.

Can you fix a leaking hot water thermostat?

Yes! In fact, most homeowners don’t even know that their thermostat needs to be replaced. Leaking thermostats can cause serious damage to your house. For example, if the leak occurs near a wall, then the moisture could cause mold growth.

Water Heater Repair: Troubleshoot and Replace Thermostats and Elements -  Dengarden

Leaky thermostats can also lead to carbon monoxide poisoning. Carbon monoxide is a colorless, odorless gas that comes out of your furnace when it overheats. It’s poisonous and dangerous.

In addition to causing health problems, leaks can also ruin your walls. The moisture will eventually seep through the cracks and rot your drywall.If you suspect that your thermostat is leaking, then you should contact a professional immediately.


A properly working hot water heater thermostat keeps your home warm in winter and cool in summer. However, if the thermostat fails, then you may need to replace it. The cost of replacing a thermostat varies depending on where you live.

The average price for a replacement thermostat is $40-$50. You can buy one at any hardware store or online retailer. However, if you have access to a plumbing supply shop, then you might be able to save money by buying a new thermostat directly from the manufacturer.

It’s important to note that some manufacturers offer warranties on their products. So, if you find that your old thermostat doesn’t work anymore, then you’ll likely get a free replacement.

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