How Water Heater Thermostat?

Test & Replace a Water Heater Thermostat: DIY Guide

We shall almost certainly all be confronted with the situation of a water heater that is not producing any hot water at some point in our lives. We have two options: either contact a qualified plumber or do it ourselves. Fortunately, most water heaters can be repaired reasonably quickly and inexpensively. There are two primary reasons for a water heater not working:

  1. the heating elements
  2. the thermostats.
  1. If you’ve never checked or replaced a water heater thermostat before, the process may appear to be too difficult to do.
  2. It’s not too difficult.
  3. Fortunately, if you have someone who knows what they’re doing to guide you through the procedure and a few basic tools, the process is pretty simple.
  1. When bathing or cleaning, no one enjoys using cold water.
  2. If you are experiencing no hot water, we will need to check the water heater thermostat and replace it if necessary.
  3. In this post, we’ll look at how to diagnose your electric water heater thermostat and, if necessary, how to replace it.

How Electric Water Heater Thermostats Work

  1. When you begin to realize that your water heater isn’t operating as efficiently as it should, the thermostat is more than likely the source of the problem, or at the very least a contributing factor.
  2. No need to repair the entire electric heater when you can save yourself both time and money by just replacing the thermostat instead.
  3. Once you’ve gone over the following instructions, it will only take a few minutes……………………..
  1. Electric water heater thermostats function by opening and shutting connections, which allow electricity to pass to the heating components of the water heater.
  2. The heating components are activated and deactivated in response to demand.
  3. All current domestic water heaters are equipped with two heating elements as well as two temperature controllers.
  4. On the side of your electric water heater, there are two panels that contain a thermostat and a heating element, one for each panel.

The higher thermostat differs from the lower thermostat in several ways.The higher thermostat is bigger than the lower thermostat, and it regulates the lower thermostat.It is quite rare for both thermostats to fail at the same time (although I do recommend replacing both when one fails).When an upper heating element or thermostat fails, the water heater’s ability to provide hot water is compromised.Whenever a lower heating element or thermostat fails, the top thermostat and heating element will take over and continue to heat water in the upper part of the hot water storage tank.Despite this, you will observe that the hot water runs out quickly or is barely lukewarm.

Are Electric Water Heater Thermostats Universal?

  1. No, not all water heater thermostats are designed to be interchangeable.
  2. It is important to note that there are certain differences in thermostats between single-element and dual-element water heaters.
  3. Additionally, with dual-element water heaters, there is a differential between the top and bottom thermostats.
  1. In order to properly select a water heater thermostat, you must first determine the number of elements and the voltage of the water heater in question.
  2. It is possible to obtain this information from the data tag located on the side of the water heater.
  3. If the data tag is not there, you may tell the difference between a single-element and a dual-element water heater by counting the number of access panels on the water heater.
  4. The voltage is inscribed on the end of the heating element, and it may be read with a magnifying glass.

240 volts is the standard voltage for residential dual-element water heaters.There are more than 50 different household tank-style electric water heaters available on the market, and the thermostats on the majority of them are designed to be interchangeable.When making a purchase, it is important to thoroughly read the product description.

Dual-Element Thermostats

  1. Typical household water heater thermostats are seen in this photo, which includes an upper and lower thermostat for each.
  2. Because it is located above the lower thermostat, the thermostat on the left has a high limit switch, which can be identified by the red reset button.
  3. The upper thermostat is in charge of controlling both the upper element and the lower thermostat, respectively.
  1. When you look at it from this angle, you can see the bottom thermostat, which regulates the lower element.
  2. For a replacement kit that includes two heating elements, upper and lower thermostats, and seals, we recommend the Rheem SP20060 Electric Water Heater Tune-Up Kit, which can be purchased on for about $30.
  3. Consider the Rheem UV11698 UV11698-Thermostat-Electric if you simply want to purchase the top thermostat.
  4. A universal upper thermostat produced by Rheem is what it is.

You may get a lesser thermostat, such as the Rheem SP11695 Electric Thermostat, if you just require one.It’s a Rheem lower thermostat that’s universally compatible with other brands.

Single-Element Thermostats

  • The thermostat seen here is for a water heater with a single heating element. The thermostat is very similar to an upper dual-element thermostat, with the only variation being the amount of wire terminals on the thermostat. In this case, the single element thermostat has just two terminals on the right side and four on the left side, as you can see in the illustration. A single-element thermostat, such as the Camco 07843 Single Element Water Heater Thermostat with HLC, is available for purchase if you require one. This is a single-element thermostat with a built-in high limit switch that is universally applicable. The following is a list of the supplies you’ll require: In addition, you’ll need a 1/4-inch nut driver or a flathead screwdriver, two Phillips screwdrivers, an analog or digital multimeter/voltmeter, and a new thermostat.

How to Test a Water Heater Thermostat for Continuity – Step-By-Step

  1. We must examine the thermostats for continuity in order to identify whether or not the thermostat has failed.
  2. You’ll need an analog or digital multimeter for this, which you can get here.
  3. WARNING: Working with electricity is extremely hazardous and can result in death.
  1. Before dealing with wiring or electrical connections, be certain that the power is turned off.
  2. Follow these procedures to determine which thermostat is malfunctioning.

Step 1: Turn the power off

Make your go to your circuit board and locate the water heater breaker to switch off the power supply. Discover and switch off the breaker that is labeled ″water heater″ or ″hot water″ in the electrical panel box where the water heater is located.

Step 2: Remove the outside access covers

To remove the access cover from the upper and lower thermostats, use a 1/4-inch nut driver or flathead screwdriver to pry them off. Fold the insulation back over the thermostat to prevent it from being damaged. To keep the insulation out of the way, use tape to hold it in place. Remove the plastic cover that covers the thermostat on the inside of the house.

Step 3: Confirm power is off to the water heater

  1. Make sure the water heater is not receiving electricity before working on it with a multimeter before doing anything on the thermostat.
  2. If you have a voltage stick, you may also use it to measure the voltage.
  3. Connect the top and legs of the multimeter at the same time, using the multimeter connectors.
  1. The meter should be set to zero.
  2. Touch each leg of the water heater while the black connector is in contact with it to ensure there is no electricity.

Step 4: Check the high limit reset button

  • If the manual reset switch, also known as the high limit reset button, has been tripped, it should be replaced. This button may trip if one or more of the following conditions exists: the thermostat contacts have fused closed
  • the thermostat contacts have fused open
  • the thermostat contacts have fused closed
  • the thermostat contacts have fused open
  • the thermostat contacts have fused closed
  • the thermostat contacts have fused closed
  • the thermostat contacts have fused closed
  • the thermostat contacts have fused closed
  • the thermostat contacts have fused closed
  • the thermostat contacts have fused closed
  • the thermostat contacts have fused closed
  • the thermostat contacts have fused closed
  • the thermostat
  • The thermostat is not in proper working order.
  • The heating element has stopped working

Step 5: Disconnect the wiring

Take a photo with your phone or a digital camera to use as a reference if it becomes necessary to identify which cables are connected to which terminal in the future. To detach the wiring from the thermostat terminals, unscrew the terminal screws using a Phillips #2 screwdriver and pull the wiring away from the terminals.

Step 6: Check the thermostat with a multimeter

  1. Set the resistance of the multimeter to the lowest ohms possible (typically x10).
  2. Using your fingers, squeeze the probes together and adjust the needle to zero to calibrate your meter.
  3. To check the resistance of a digital multimeter, set it to the lowest possible value of resistance (usually 200), or, if your multimeter has an option for resistance with tone, choose it.
  1. Take one of the black probes from your multimeter and insert it into the screw terminal on the left side of the instrument.
  2. Take the red probe and connect it to the other left-side terminal on the other side.
  3. Ideally, the meter should read close to zero if the terminal is in good working order.
  4. This means that the thermostat is not functioning properly and must be replaced.

This procedure should be repeated for the right-side terminals and the element terminals.For a demonstration, please see the video above.You will need to repeat these procedures for the lower thermostat and element if the higher thermostat and element are working properly.As soon as you have finished testing your water heater thermostat, you may either reconnect the wire and close the access cover, or you can proceed to the next step, which is replacing the thermostat.Assuming you have decided that your thermostats do not require replacement, you may proceed to inspect your heating components.To do so, please see our How to Test and Replace a Bad Water Heating Element page, which includes step-by-step instructions.

How to Replace a Faulty Water Heater Thermostat – Step-By-Step

  1. Once you’ve discovered which thermostat is faulty, it’s time to begin the process of removing and replacing it.
  2. A word of caution: As previously said, it is typically recommended to change both thermostats and heating components on a regular basis.
  3. The reason for this is that if one of the heating components is beginning to fail, it has the potential to short out the replacement thermostat shortly after it has been placed, causing it to fail.
  1. Some of the stages will be repeated in this section.
  2. Assuming you performed the testing procedures outlined above, you may be able to skip to Step 5.
  3. For those who have not yet tested their thermostats, we will first go through the preparatory processes.
  4. We’re going to start from the beginning.

Step 1: Turn the power off

Take a trip over to the circuit breaker box and look for the switch labeled ″Water Heater″ or anything along those lines. It should be turned off, making sure to turn off both switches if it is a 220v switch. If you’re not sure which water heater is causing the problem because of outdated stickers or labels, get a professional to turn them off for you.

Step 2: Remove the outside access covers

  1. Remove the cover panel that corresponds to the thermostat that has to be replaced and set the cover panel aside.
  2. The coverings for water heater tanks are often located on the side of the tank.
  3. Ensure that you do not loose any of the little screws by using the 1/4-inch nut driver or a flathead screwdriver for this section.
  1. Remove the insulation from the thermostat as well as the plastic protective cover that covers it.

Step 3: Confirm power is off to the water heater

  1. Each wire should be tested with your multimeter/voltmeter.
  2. This may be accomplished by grounding one of the lines and checking each terminal one at a time until the problem is resolved.
  3. While you may have shut off the electricity at the breaker, you should always double-check your work using one of these meters to ensure that you haven’t accidentally caused an electrical shock.
  1. Connect the top and legs of the multimeter at the same time, using the multimeter connectors.
  2. The meter should read 0 at this point.
  3. Touch each leg of the water heater while the black connector is in contact with it to ensure there is no electricity.

Step 4: Disconnect the wiring

Take a photo with your phone or a digital camera to use as a reference if it becomes necessary to identify which cables are connected to which terminal in the future. Disconnect the wiring from each terminal on the thermostat with a Phillips screwdriver #2. Remove the thermostat from the wall.

Step 5: Remove the defective thermostat

Gently remove the old thermostat by pulling outward on the clips and raising the thermostat up and out of the retaining bracket with your finger or a flathead screwdriver. Caution should be exercised to avoid breaking the retainer bracket. It is possible that breaking this retaining clip will result in the need to replace your water heater.

Step 6: Insert the new thermostat

  1. Inserting the new thermostat into the retaining bracket that holds the old thermostat in place will allow you to precisely position the new thermostat.
  2. Reconnect the wires to the relevant terminals by twisting them together.
  3. If necessary, you can refer to the photograph you took previously for guidance.
  1. Check to see that each wire is securely linked to the next.
  2. Check to see that the thermostat is securely attached to the water heater, otherwise the thermostat may not operate correctly.
  3. After that, adjust the thermostat to the temperature you like for the water.
  4. We recommend that you use water that is no hotter than 120 degrees Fahrenheit.

These modifications may be accomplished with the use of a flathead screwdriver.Using this temperature level is critical since anything greater than this can present an immediate scorching risk for youngsters and the elderly.Tips from the experts: If you intend to replace your heating element with a new thermostat, you must first empty your water heater.Some people propose doing a quick change without draining the storage tank; however, I do not encourage this because any mistakes might cause harm to the interior of your house.Draining your water heater, as well as other maintenance suggestions, may be found in our post Water Heater Maintenance Tips for Gas and Electric Tank Water Heaters.-

Step 7: Reattach the cover panels

Now that you’ve completed the replacement, it’s time to seal everything up and double-check your work for mistakes. Remove the plastic protective cover and insulation and replace them with new ones. Reattach the outside access panels if they have been removed.

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Step 8: Turn the power back on

Following the completion of the installation, return to the electrical box and re-energize the circuit breaker (if necessary). Hot water recovery will take roughly one hour to complete, but you should be able to start using hot water within 15 minutes after turning on the faucet. Over the next several days, make sure to check on the water heater on a regular basis.

Water Heater Thermostat FAQs

What should water heater thermostats be set at?

  1. Electric water heater thermostats are typically pre-set by the manufacturer to 110 or 120 degrees Fahrenheit, depending on the model.
  2. You have the option of increasing the temperature to the maximum setting, which is typically 150 degrees Fahrenheit, if necessary (65 degrees Celsius).
  3. The maximum water temperature setting should be no greater than 120 degrees Fahrenheit (48 degrees Celsius), since a higher setting might provide a scorching threat to small children and the elderly.

Should water heater thermostats be set to the same temperature? 

In fact, the top and lower thermostats should both be set at the same temperature. The dip tube is responsible for delivering cold water to the bottom of the tank. Having consistent settings across the tank helps to keep the temperature consistent throughout the tank.

What would cause a water heater thermostat to burn up?

  1. A malfunctioning heating element, a power surge, or just the passage of time can cause a water heater thermostat to burn up.
  2. When internal components of water heater thermostats wear out, they become faulty and fail.
  3. Even with regular electric currents, an older thermostat may experience failure.
  1. If the manual reset switch on your water heater thermostat does not work, the thermostat will need to be repaired or replaced.
  2. Replacement of both thermostats and heating elements should be done at the same time because if one of the heating elements is beginning to fail, it may cause the new thermostat to short out shortly after it is installed, which is not recommended.

Final Thoughts

  1. Simply said, that’s the whole story!
  2. Water heaters aren’t too difficult to maintain, and replacing a thermostat can be completed in a matter of minutes if you know what you’re doing and have the right tools.
  3. The most important thing to remember while working with electrical equipment is to avoid taking shortcuts.
  1. Although it is possible to change your water heater thermostat in a short period of time utilizing the correct skills and tools, doing so is not recommended.
  2. DISCLAIMER: The information provided on is not intended to be professional guidance.
  3. Before beginning any job, you should contact with a competent expert and verify that all necessary permits have been obtained.
  4. It is owned and operated by Hubert Miles who is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by placing advertisements and links on their websites that direct traffic to (hereinafter referred to as ″″ or ″ Associates Program″).

As an affiliate, participates in a variety of affiliate programs with other websites.Hubert Miles receives a commission for recommending visitors and commerce to these businesses.


The thermostat on a water heater is an important component since it is responsible for the majority of the heating of the water. It ensures that the heating process is maintained and that you receive correctly tempered water every time you use your geyser.. Make sure to go through our explanations if you want to understand how thermostats function..

What is a Water Heater Thermostat?

  1. Is it something you’d prefer if your water heater provided you with varied temperatures at different times?
  2. Isn’t that correct?
  3. As a result, the water heater is equipped with a thermostat.
  1. The thermostat ensures that a certain temperature is maintained at all times.
  2. When the temperature falls below the specified level, the thermostat increases the pace of the power supply in order to maintain the temperature.
  3. At the same time, when the electric supply achieves the specified temperature of the water, the thermostat shuts down the power supply system.
  4. Consequently, you may see how important a thermostat is in maintaining the ideal temperature in a water heater.

It performs its function by monitoring the temperature on a constant basis.Additionally, it ensures that the water remains at the precise temperature set by the water heater until the water heater is shut off.

Where is the Thermostat Situated in a Water Heater?

  1. There are two options for where the thermostat should be located: outside or within the tank.
  2. In India, you may get one of these varieties.
  3. The thermostats that are displayed can be controlled.
  1. This implies that you have complete control over the temperature to keep it at your chosen level.
  2. The other sorts of thermostats are not capable of being controlled.
  3. They are pre-programmed to a specific temperature setting.
  4. In such conditions, the temperature remains between 55 and 60 degrees Celsius..

With these warmers, you will receive both green and red light.If the temperature is noticeable or whether the heating process is underway is indicated by this.

Does the thermostat turn off when not in use?

  1. The answer is an unequivocal no.
  2. The thermostat’s only responsibility is to keep the temperature stable and comfortable.
  3. When the water heater is not in use, you cannot rely on the thermostat to turn it off automatically.
  1. The majority of people believe that the thermostat will switch off the water heater when it is not in use.
  2. This is incorrect.
  3. However, this is not the case.
  4. The water heater is responsible for heating the water and keeping it warm for a specified period of time.

Following that, the temperature will automatically decrease.When the temperature begins to drop, the thermostat begins to heat the water once more.And the cycle continues until the water heater is switched off completely.As a result, if you leave the heater turned on, it will never switch off on its own; instead, it will use energy.

What is the Ideal Temperature of Water in a Water Heater?

  1. The temperature of the water heater has a considerable impact on the amount of power that may be saved.
  2. As a result, it is extremely important to pay attention to the temperature setting.
  3. The majority of water heaters have a temperature range of 40-75 degrees centigrade.
  1. The optimal temperature, on the other hand, is 50 degrees.
  2. Take note that when the temperature is high, the amount of power consumed will also be more than usual.
  3. Consequently, it would be perfect if you could control the temperature of the bar to a moderate level.
  4. A solar water heater might help you save money on your utility bill.

Additionally, the electric water heater should be used as a backup.Solar water heaters are environmentally friendly and rely on solar energy.When it’s overcast or chilly outside, you may utilize the electric heater as a back-up heating source.

What is the BEE Star Rating?

  1. The BEE star rating in the geysers may not be of importance to most people.
  2. However, they are really crucial to take attention of.
  3. It makes a significant contribution to energy conservation.
  1. The Bureau of Energy Efficiency (BEE) awards higher ratings to heaters whose heat loss is less than a certain threshold.
  2. That is, in order to obtain higher rates, the heater must be capable of maintaining the water’s temperature for an extended length of time.
  3. The physics behind it is that the greater the amount of time the heater is able to keep the water heated, the less frequently the thermostat will be utilized.
  4. As a result, a significant amount of energy will be saved.

As a result, if you leave the geyser running, it will use less power than the lesser-starred goods.As a result, it is more prudent to purchase a product that has received 4-5 stars from BEE.

More Noticeable Points To Save Electricity

  • If the water heater is larger in size, it is possible that the heater will consume more power. As a result, pick the appropriate size.
  • Always heat the water to the precise temperature that you want. Overheating will result in increased energy use.
  • Keep the heating turned off if it isn’t absolutely necessary.
  • You may put thermal insulating paint on the pipes and water heater to keep the heat from escaping through the walls. The use of wall paints can also be beneficial.
  • Last but not least, pick a water heater that is energy efficient and has a star rating of between 4-5.
  1. The water heater is a necessary component for dealing with the chilly mornings that occur throughout the winter.
  2. The importance of making the proper decision cannot be overstated.
  3. Select the most appropriate product and enjoy hot water.
  1. Mr.
  2. Shirsendu Roy is a co-founder of REVIEWCIRCLES and the company’s Chief Technology Officer (CTO).
  3. He holds a Bachelor of Computer Science degree and has more than seven years of professional experience in web development, technology blogging, and review video production.
  4. His desire to find solutions to issues led him to the consumer electronics industry, where he founded this platform to persuade consumers to make informed purchase decisions about consumer electronics.

7 Steps to Test Water Heater Thermostat

  1. It is possible that you may detect two thermostats on your electric water heater when you inspect it: one at the top and one at the bottom.
  2. Each of these devices regulates the temperature of two separate heating components.
  3. If you switch on the hot water faucet and only cold water comes out, this indicates that the higher thermostat has failed.
  1. However, if the water is hot at first and subsequently gets chilly, this indicates that the lower thermostat has been destroyed.
  2. You will, however, need to understand how to test a water heater thermostat in order to identify the defective device.
  3. You’ll be able to correct the situation as soon as you finish this activity.
  4. Regardless of whether you have a propane tankless water heater or any other type, the thermostat is an excellent tool for controlling the temperature.

But first, let us have a look at how a thermostat operates.

How Does A Thermostat Work?

  1. In most cases, an electric water heater has three primary characteristics.
  2. It is equipped with an electric heat source as well as a temperature control system and a switch to protect the device from excessive heat.
  3. A thermostat may be used to create hot water that can be used for a variety of applications.
  1. Consider that the degree of heat necessary for washing may differ from the level of heat required for bathing, for example: Furthermore, it regulates the amount of electricity that flows to another thermostat or heating element, among other things.
  2. An electric heater with a storage tank of at least 30 gallons is equipped with two heating components, each of which has a thermostat on the other end.
  3. The primary thermostat is located on the top of the unit, which also has a high limit switch.
  4. The bottom one, on the other hand, is sensitive to any change in the temperature of the water.

Both thermostats (which are installed on the same water heater) do not have the same set of capabilities.They even don’t work at the same time as one another.On the same wall as the top thermostat, you will find the high limit switch.It also features a button that prevents it from operating, particularly when the water temperature exceeds 170 degrees Fahrenheit.This button can be used to reset the system to its default settings.To set the thermostat on a water heater, you must first adjust the thermostats on both the water heater and the furnace to equivalent temperatures.

  • Alternatively, you may set the upper element to a lower temperature, letting the bottom element to operate first, so saving energy.
  • Temperature regulation is handled by a single thermostat and heating element in water heaters with smaller tanks (up to a maximum of 30 gallons).
  • They do, however, have a high limit switch, similar to the bigger water heaters.

How to Test Water Heater Thermostat

  1. It is also necessary to examine the heating element on an electric water heater if you wish to test a thermostat on it.
  2. This is critical, especially given the fact that open and grounded heating components result in erroneous testing outcomes.
  3. You will need to use a screwdriver to inspect the vehicle for problems.
  1. As part of the water heater inspection, digital multimeter equipment will be used to assess the temperature of the water heater.
  2. Let’s get started with the procedures that will show you how to test a water heater using a multimeter in the next section.
  1. Make your way over to the thermostat terminals and check to see whether it is receiving electricity. It is possible that terminals 1 and 3 will show a reading of 240V if this is the case. However, if there is no reading, the power source should be checked. Examine the high limit switch for any signs of current as well.
  2. By turning the thermostat’s dial to the lowest position, you can disable the lower thermostat. After that, raise the temperature of the top thermostat to check for malfunctions.
  3. Connect the prongs of the multimeter to the terminal 1 and the blue wire of the heating element to test the voltage. This will assist you in determining whether or not electricity is being delivered between the upper heating element and the blue wire
  4. if the instrument reads 240V, it indicates that power is being supplied to the setup. After that, connect the prongs of the heating element to terminal 2 and the blue wire of the heating element. However, if there are no readings, this indicates that the thermostat is malfunctioning.
  5. Reduce the temperature of the heater to a lower setting. Adjust the dial on the top thermostat to the smallest setting possible while setting the dial on the other thermostat to the highest setting possible
  6. Return to the bottom heating element’s terminal 1 and the red wire that connects to it. Power should be detected by placing a probe on each of them. If the voltage reading is 240V, there is power in the setup
  7. connect the probes to terminal 2 and the red wire of the bottom heating element
  8. and test the system. If you are not getting any readings from your thermostat, you will need to replace it.

How to Replace a Faulty Thermostat on an Electric Water Heater

  1. Installing an electric switch to change the thermostat on an electric water heater is as simple as turning on the water heater.
  2. Knowing how to test a thermostat allows you to do the necessary repairs without having to empty the storage tank first.
  3. In order to avoid any potential mishaps, you must first cut off the power source and check the cables for voltage before proceeding with the work.
  1. You will need to adjust both thermostats on your water heater if you want really hot water.
  2. If the problem is caused by a single thermostat, it is advised that you replace the two thermostats because they are quite inexpensive to replace all at once.
  3. It is recommended that you replace your present thermostat with a new one from the same manufacturer before making any changes.
  4. If you are unable to locate a suitable replacement from the same manufacturer, try for a similar item from another manufacturer.
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Don’t forget to include a non-contact voltage tester as well as screwdrivers on your shopping list.

Deactivate the Power Supply

  1. Switching off the circuit breaker that is attached to the water heater will turn off the electricity to the water heater.
  2. Water heater breakers are typically comprised of two distinct single-pole switches with a combined 30 amp rating.
  3. Some versions, on the other hand, have more amps.
  1. The panel that covers the thermostat and heating element of your electric water heater should be removed.
  2. It is possible that you may need to use a screwdriver on some versions since the panels are bolted together.
  3. Make certain that you remove the insulation from the back of the panel without disturbing the wires in any way.
  4. To avoid electrical shocks, make sure there is no current flowing through the thermostat.

It is possible to use a non-contact voltage tester at this point to verify the screw terminals and wires for continuity.

Pull out the Faulty Thermostat

  1. Take a photo of the thermostat’s connections.
  2. After you have learnt how to test a thermostat, you may use the illustration as a reference.
  3. If you are feeling creative, you may also produce a short sketch.
  1. Remove the thermostat’s screw terminals by unscrewing both of them.
  2. Then pull each wire on both of them out one at a time.
  3. After that, unclip the thermostat from its connection clips and carefully lift it out of the thermostat chamber.
  4. To avoid damaging the clips, apply only the bare minimum of force.

To avoid damaging the clips, apply only the bare minimum of force.

Set Up the New Thermostat

  1. Insert the new thermostat into the matching clips on the wall.
  2. Check to see that it is properly resting on the surface of the storage tank.
  3. Connect the circuit wires to the matching screw terminals on both sides of the board.
  1. Tighten the screws to secure them in place.
  2. Increase or decrease the temperature setting on your thermostat according to your preferences.
  3. A flat blade screwdriver will be required in this situation.
  4. It is recommended that you set the temperature to 120 degrees Fahrenheit.

Add Final Touches

Replace the thermostat chamber panel as well as the insulation surrounding it. By resetting the circuit breaker, you may reconnect the circuit to its power supply once more. Allow for two hours of operation from the water heater, then check the hot water tap to verify whether the water is sufficiently heated

How to Troubleshoot a Defective Thermostat on An Electric Water Heater

Troubleshooting the thermostat on your water heater may appear to be a complicated task. This tutorial will assist you in doing this task without the need to consult an expert.

  1. To turn off the electricity to the thermostat, go to the circuit breaker and turn it off. Because it protects you from electrical shocks, this procedure is really necessary. A two-pole breaker will cause both breakers to trip at the same time if you are working with two breakers.
  2. Remove the two panels that protect the thermostat from the wall. Insulation that corresponds to the aperture is found beneath the cover. Remove the item and store it aside for later installation.
  3. The thermostat and heating element should both have a plastic panel on them. A button may be found beneath the panel. It should be pressed to confirm that it is in great working order.
  4. Keep an eye out for a ″snapping″ motion when you press the button. In the event that you experience any, turn on the power and allow it to run for a few minutes.
  5. Check to see whether there is no power to the unit, especially if you want to continue working on the equipment. Make use of a non-contact voltage tester to test a pair of wires towards the top of the circuit. If you don’t see any lights or hear any beeps on the meter, this indicates that there is no energy flowing through the thermostat.
  6. Even if you do not see any readings on the tester, continue to work on the machine as if there were power. Remove the plastic cover from the thermostat by gently pulling it out or unscrewing it. Avoid inserting your fingers too far inside the device in order to avoid potential mishaps.
  7. Remove the battery and connect it to a voltmeter with a minimum voltage of 240 volts on it. Place the test lead on all of the higher screws. Do not remove the lead. If you get a reading, it means that the power is switched on
  8. turn it off and check again later. There must be no electricity running through the device.

Wrap Up

  • An electric water heater, like a tankless water heater, is equipped with a thermostat. Fortunately, just a few equipment are required for testing and repairing a malfunctioning thermostat, including a multimeter and a pair of screwdrivers. To solve this dilemma, you don’t even need to have any special abilities. All you have to do is follow these simple instructions. Turn off the electricity
  • When you test the device, make sure there are no difficulties. If there are, remove the present thermostat and replace it. In order to avoid any shocks while working, it is recommended that you periodically check the equipment for any current.

We really hope you found this information informative. If you have any remarks, please leave them in the comment section below.

How to Set How Water Heater Temperature by Thermostat

You might be wondering how to adjust the temperature of your hot water heater. In this section, you will learn all you need to know about your gas or electric water heater thermostat, including how to adjust your hot water heater temperature thermostat and what temperature is optimum for hot water.

What’s the Right Temperature for a Hot Water Heater?

  1. It’s an often asked question: what is the optimal temperature for hot water?
  2. Setting a tank-based hot water heater to 120 degrees Fahrenheit is recommended by the United States Department of Energy.
  3. If you have never changed the temperature of your hot water heater, it is most likely set to the 140-degree Fahrenheit level that is recommended by most manufacturers of hot water heaters.
  1. What is the significance of adhering to this temperature standard?
  2. If the water heater thermostat setting is set to an excessively high temperature, the water will be too hot and might cause burning or scorching.
  3. If it is set too low, germs may be able to flourish, leading to the spread of water-borne illnesses.

How to Set Your Hot Water Heater Temperature Thermostat Setting

  1. Before you make any modifications to the temperature thermostat setting on your hot water heater, you should first ascertain what the current temperature is set at so that you can establish how much you need to alter the settings.
  2. A conventional cooking thermometer may be used to quickly and accurately detect the temperature.
  3. You should calibrate your thermometer once you have determined the current temperature setting.
  1. Fill a cup halfway with cold water and submerge your thermometer until the temperature dial reaches 32 degrees, or the lowest temperature displayed on your thermometer’s gauge, and then remove it.
  2. By calibrating the thermometer, you are effectively resetting it so that you will be able to acquire an accurate temperature measurement in future.
  3. Meanwhile, locate the faucet that is closest to the water heater and turn it on until it is hot (while you are calibrating your thermometer).
  4. Precautions must be taken!

If your thermostat is set too high, the temperature may be high enough to burn you.Once the water is hot, fill a cup halfway with it and take the temperature with a thermometer by inserting it in the water.

Adjusting a Gas Hot Water Heater Temperature Thermostat Setting

The majority of gas water heaters are straightforward due to the presence of a clearly readable dial at the bottom of the tank’s bottom section. If you follow the methods outlined below, it is simple and straightforward to alter this dial.

  1. First, adjust the temperature by turning the knob to the hotter or cooler position, depending on the situation.
  2. After that, let it sit for a few hours (around three or four) and then check the temperature again.
  3. If the temperature is still incorrect, make another adjustment and repeat the process until the problem is resolved. Do you require assistance? Give Hackler Plumbing a call if you want the services of a McKinney plumber, and we will be happy to assist you

Adjusting an Electric Hot Water Heater Temperature Thermostat Setting

  1. The process of adjusting the temperature thermostat setting on an electric hot water heater is a little more difficult, but still pretty simple.
  2. The vast majority of electric water heaters are equipped with two thermostats: an upper and a lower thermostat, both of which are placed beneath two control panels.
  3. Setting both thermostats to the same temperature can help to guarantee that your electric water heater operates as effectively as possible.
  1. One thing to keep in mind is that some tiny electric hot water heaters only have one thermostat.

Here’s how to adjust the temperature on your electric hot water heater thermostat:

Please keep in mind that you will want a screwdriver to execute the following procedures in order to alter the temperature of your water heater.

  1. Make sure your water heater is off by turning off the electricity. This may be accomplished by locating your circuit breaker and shutting off the electricity in the area surrounding your water heater
  2. Then, locate the thermostat(s) on your water heater and turn them on. Typically, they are located behind a control panel that is secured with screws. Remove the cover from the access panel using your screwdriver (s). To access the thermostat, you may need to remove the insulation from your heater if it is properly insulated. The thermostats will be controlled by a dial, and the dials will have a varying reading depending on the manufacturer of the heater.
  3. Once the control panel has been removed, you may change the temperature knobs to make the room hotter or colder according on your preferences in terms of temperature. Take care to set both thermostats to the same temperature setting if you have more than one.
  4. Replace the control panel covers and the screws with your screwdriver after they have been removed. After that, re-energize your water heater’s electrical system.
  5. After a few hours, check the temperature of your hot water again (about three to four). Continue to follow the above instructions until the water temperature reaches the required setting
  6. if it still does not, repeat them until the temperature reaches the ideal setting for your needs.

Other Considerations: Water Heater Thermostat Setting Safety

  1. There is one thing you should be aware of: your water heater is fitted with something known as a temperature and pressure relief valve, sometimes known as a ″T&P valve.″ These can become worn out over time, and one sign that they should be replaced is the presence of water leaking through.
  2. This is a very crucial safety feature.
  3. In the event that your unit is outdated or if your hot water heater pressure relief valve leaks after being replaced, get it examined by a competent plumber.

How does a water heater thermostat work?

It is possible to have one or two thermostats on an electric water heater, depending on how many gallons are in the tank. The thermostats govern the temperature of the water. The thermostats function by activating the heating components when the water temperature drops below a predetermined level.

What happens when thermostat goes out on hot water heater?

Upon reaching a certain temperature in the top element, the thermostat shuts off and reroutes electricity to the bottom element, preventing damage to the upper element. Despite the fact that the lower thermostat has failed, the heater will still be able to provide a limited amount of hot water. If, on the other hand, the top thermostat fails, there will be no hot water whatsoever.

How long should a hot water heater thermostat last?

Between the ages of 6 and 13 years The ability to predict when it is time to replace your water heater would be beneficial in order to avoid an inconvenience or worse, structural damage to your property. Residential hot water heaters have a lifespan of between 6 and 13 years on average. You are on borrowed time if you are beyond the age of 12!

Where is the thermostat in a water heater?

Electric water heaters are frequently equipped with two thermostats: one at the top of the tank and another at the bottom. Furthermore, most tankless water heaters include a display with a temperature reading as well as controls for altering the water heater’s temperature.

Why does my hot water heater have 2 thermostats?

The two thermostats on an electric storage-tank water heater are necessary since the heater has two heating components. The thermostats are constructed in such a way that only one element is operational at a time. While in operation, the fact that only one element is active at a time makes it possible to employ smaller wire widths and reduced amperage demands.

How does the thermostat work in a hot water tank?

  1. The thermostat transmits an electrical current to the element, which subsequently heats the water at the tank’s top, which is controlled by the thermostat.
  2. Once the water in the upper half of the tank has been sufficiently heated by the upper heating element, the thermostat that regulates it switches it off.
  3. The bottom element, like the top element, is regulated by a separate thermostat from the upper element.

How does an electric hot water heater work?

The majority of electric hot water tanks are equipped with two elements and two thermostats. Neither the elements nor the heat exchanger heat up at the same time. The top element heats the water first, and then the lower element comes on to complete the heating cycle. The top thermostat serves as a link between the two other sections of the system.

See also:  Why Does My Tankless Water Heater Go Cold

Do you have to set the thermostat on both electric water heaters?

Setting both thermostats to the same temperature can help to guarantee that your electric water heater operates as effectively as possible. One thing to keep in mind is that some tiny electric hot water heaters only have one thermostat.

Why does my electric water heater turn on when the water is too cold?

When the lower thermostat detects that the water is becoming too cold, it activates the lower element. This occurs only when the top element has completed its heating cycle. You will need to conduct some testing in order to establish which element or thermostat is malfunctioning. There is another possibility for your being here.

What is a Water Heater Thermostat? How it Works?

  1. Water heating is a critical component that must be performed correctly in order to prevent incurring high energy expenses.
  2. Any type of heating or cooling system needs a significant amount of power to operate.
  3. As a result, maintaining an ideal temperature is essential for reducing power consumption.
  1. Most contemporary water heaters are equipped with a thermostat, which helps to preserve energy.
  2. Are you unsure of what a water heater thermostat is or how it functions?
  3. Read this article to learn everything there is to know about thermostats.

What is a Water Heater Thermostat?

  1. An electronic water heater thermostat that responds to temperature changes is often a thermocouple that generates very little current when exposed to heat.
  2. When the temperature of the water increases to the required level, the thermostat will turn off the electricity supply.
  3. Once again, when the temperature of the water lowers, the thermostat will work in such a way that it generates more electricity in order to heat the water as efficiently as possible.
  1. Fluctuations in the output of electric current lead the gas valve control on the water heater to alternately switch ON and off.
  2. As a result, the thermostat will guarantee that the water is heated to the desired temperature before shutting down the power supply system.
  3. The electricity is turned back on only when the temperature of the water falls below a certain threshold level.
  4. A thermostat helps to conserve a significant amount of electricity by adjusting the water temperature and continually switching on and off the power source.

This can dramatically reduce the amount of money you spend on energy costs.

Where is the Thermostat in My Water Heater?

  1. You are unsure about the exact location of the thermostat in your water heater.
  2. Generally speaking, there are two types of water heaters available in India: one with a visible thermostat and settings that can be changed easily, and another with a thermostat that is hidden and whose settings cannot be changed at any time.
  3. It will be possible to twist the knobs on the water heaters that have adjustable thermostat settings in order to modify the temperature levels.
  1. The latter, on the other hand, offers pre-configured temperature settings ranging from 55 to 60 degrees centigrade to choose from.
  2. These are often equipped with red and green LEDs that show whether or not the water is heating up.

Technical Characteristics of Water Heater Thermostat

For thermostats in electric water heaters, geysers, and other similar appliances, the Bureau of Indian Standards has validated the technical standards listed below.

Different Types of Thermostats

When shopping for a water heater, you may come across three distinct types of thermostats, each of which is powered by a different form of technological innovation. Let’s get this straight: Let’s start with the basics:

  1. With its long stem that expands when the temperature rises, the ″plugged-in″ thermostat is dependable and reasonably priced, and it is also easy to install. Because of this, it is programmed to shut off the power supply when the temperature reaches the pre-set temperature threshold.
  2. Bulb Thermostat: Also known as a capillary thermostat, this type of thermostat is more exact and dependable. The bulb of the thermostat is filled with a heat-reactive fluid, the volume of which rises or decreases in response to changes in the temperature of the heater. Because of this, the thermostat will either halt or activate heat production when the temperature rises or falls above or below the preset threshold.
  3. Using a digital thermostat makes temperature control even more accurate and allows you to program a wide variety of temperature settings. It is equipped with a thermistor, which uses electrical resistance to detect changes in temperature as they occur. Because of changes in water heater temperature, the resistance value will fluctuate as well.

What Should be the Ideal Temperature of My Water Heater?

  1. Is it difficult to determine what the best temperature for your water heater should be?
  2. The optimal temperature for a water heater is roughly 50 degrees centigrade, which is good for a wide range of applications..
  3. In India, the majority of water heaters have a temperature range ranging from 40 to 75 degrees Celsius, depending on the model.
  1. That is, if you want the warmest temperature setting on your thermostat, you should set it to 75 degrees.
  2. The temperature knob on the water heater should be set in the center or middle position to provide the appropriate quantity of warmth while also saving money on energy costs.
  3. It is critical to note that the entire quantity of energy required by the water heater will be determined by the temperature of the water going into it and the setting of the thermostat.
  4. If the difference is large, then the amount of energy consumed will be greater as a result.

Does the Thermostat Switches off the Water Heater When the Heating Temperature Reaches the Set Level?

  1. It is common for consumers to believe that the thermostat will shut down their water heater after the temperature has reached a predetermined level.
  2. As a result, they keep the heater switched ″ON″ all of the time, under the impression that the thermostat will automatically turn it off.
  3. This, however, is not the case at all.
  1. Once a temperature drop of a particular degree is reached, the heater will automatically kick on.
  2. Eventually, this will result in a major reduction in available electrical supply.
  3. Remember to turn off the water heater after you are through using it.


The ability to understand how a thermostat works will assist you in making the most of your water heater, improving its long-term performance, and lowering your energy expenses.

How to Test a Water Heater Thermostat With a Multimeter

  1. Is your water heater no longer supplying hot water, or does the water get chilly after a few minutes of operation?
  2. It is possible that there is an issue with the heating components or the thermostat.
  3. If you know how to test a water heater thermostat, you can figure out who’s to blame for the problem.
  1. The thermostat regulates the preset water temperature of the water heater, ensuring that you always have hot water at a consistent degree.
  2. Unfortunately, it has the potential to be harmful in the long run.
  3. Performing an electric water heater thermostat troubleshooting procedure might assist in determining the present state of the thermostat.
  4. This guide will teach you how to do it.

Things You Need for This Tutorial

  1. A few items are required for testing the water heater thermostat.
  2. It is preferable to locate the thermostat in your water heater first before testing it with a digital multimeter to ensure that it is functioning properly.
  3. For further information on where the thermostat on a hot water heater is located, go to the owner’s handbook, which will include an image of the water heater’s various components.
  1. Most electric water heaters are equipped with two thermostats, which regulate the temperature of the water in the top and lower tank parts, respectively.
  2. The thermostats will be protected from the elements by a cover that will be attached to the access panel.
  3. You may use an analog multimeter if you want to save money because they are quite affordable.
  4. However, I prefer a digital gadget since the findings can be seen on its huge LCD screen, which I find more convenient.

Analog devices are distinguished by the presence of a needle that points to the value range.It is possible that you will not be able to read the findings correctly if you have vision difficulties.Although it is not required, I recommend that you get a non-contact voltage detector (people call it a voltage stick).You’ll need this to double-check the electrical power condition of the water heater before continue with the thermostat testing procedure.The screwdriver is yet another essential piece of equipment.It is possible that the sort of fastener used to secure the wires to the thermostat will be specified in the handbook.

  • The majority of devices feature slotted screws, which need the use of a flat-tipped screwdriver.

Steps for Testing a Water Heater with a Multimeter

Step 1. Cut off the water heater’s power supply.

  1. The majority of electric water heaters do not have a manual power on/off button since they are connected to a circuit breaker via which they receive their dedicated electrical connection.
  2. Ensure that the circuit breaker that is connected to the water heater is turned off at the circuit breaker panel.
  3. Depending on who installed the system, you should be able to identify the breaker by examining the label.
  1. If there are no labels on the circuit breakers, you may be forced to switch off the whole panel of circuit breakers.
  2. You may also try turning off the circuit breakers one at a time until you are certain that the water heater has been switched off completely.

Step 2. Access the water heater thermostats.

  1. Remove the screws that hold the thermostat access panel covers in place with a screwdriver when they have been unfastened.
  2. Open the upper panel first before removing the bottom thermostat chamber from its mounting bracket.
  3. Each thermostat will be equipped with an insulating cover made of plastic and a cutout flap on the top.
  1. Using tape, attach the cutout flap in either the down or up position.
  2. Remove the plastic insulating cover by peeling it off using a flat-tip screwdriver.
  3. Remove the insulating material and store it in a secure location.
  4. Pro tip: After removing the plastic insulating cover from the thermostats, use a non-contact voltage detector to verify the electric current flowing through them.

After checking the circuit breaker panel and retesting, if the gadget detects voltage, the device should be replaced.When the water heater is turned on, do not proceed with the testing of the hot water heater thermostat.

Step 3. Prepare your multimeter.

  1. Connect the black male plug to the COM port on the multimeter, and then place the red plug into the Voltage port (labeled VmA) on the multimeter.
  2. Make that the Resistance Mode (marked nS) is selected on the multimeter’s dial and that the range is adjusted to match the Ohms rating of the water heater thermostat.
  3. If you are doubtful of the resistance rating of the water heater, you might increase the range value of the multimeter.
  1. You may always adjust the multimeter’s range to a lower value at a later time.
  2. If the device displays OL, this indicates that the range value is too low.
  3. If you have a multimeter with an Auto-Range capability, that’s another option.

Step 4. Prepare the thermostats.

  1. An integrated safety function (the reset button) allows thermostats to turn off electrical power (also known as tripping the circuit breaker) in the event of a power failure.
  2. To reset the system and confirm that no energy is flowing through it, press this button.
  3. Make sure that you have isolated the thermostats by removing the bolts that link the electrical power lines to their terminals.
  1. Make a note of the wires’ orientation so that you can reference it while replacing them.

Step 5. Test the thermostats with the multimeter.

  1. You are now ready to use your multimeter to check the temperature of the hot water heater.
  2. This stage can be difficult for first-timers, but we will take it step by step, explaining each procedure as we go.
  3. To begin, use a multimeter probe to gently contact the reset terminal.
  1. Because electrical resistance is not directional, there is no need to be concerned about which electrode to utilize.
  2. The reset terminal may be found next to the thermostat’s reset button, on the left side of the thermostat.
  3. After that, connect the other multimeter electrode to the left-side terminal of the thermostat, making sure to keep it at a safe distance from the first probe.
  4. The third step is to read the value from the multimeter.

When the electric water heater thermostat test is completed, you will want the result to be zero (0.00) or very near to zero (0.001), indicating that the thermostat is still working.If, on the other hand, the multimeter displays a reading of ″1.00,″ you may have a faulty thermostat that has to be replaced.Finally, move the second lead to the thermostat’s right-side terminal, while retaining the first probe connected to the reset terminal on the thermostat.Examine the outcomes and make appropriate interpretations (remember, 0 is good, 1 is bad).

Step 6. Test the water heater’s water temperature settings.

  1. When a functional thermostat is not in use, the preset water temperature may not be maintained.
  2. For example, you may set the thermostat to 120 degrees Fahrenheit, but the thermostat may set it to 110 degrees or 130 degrees.
  3. Connect a multimeter lead to the thermostat’s common terminal on the left side.
  1. This may be found in the lower section of the thermostat’s housing.
  2. Touch the second probe to the thermostat’s top heating element post and read the result that is shown on the screen.
  3. If the value is 0.00, your water heater warms the water at a lower temperature than the temperature you selected on the thermostat.
  4. Third, move the second electrode to the bottom heating element post and reconnect it.

If the measurement is 1.00, the water heater warms the water to a temperature that is greater than the setting that has been set.Using the lower thermostat, repeat the operation, taking note of the findings.Keep in mind that a 1.00 result indicates that the water temperature is greater than the preset threshold, whereas a 0.00 result suggests the reverse (the water temperature is lower than the preset temperature).

Step 7. Compare the readings for the upper and lower thermostats.

Investigate both the top and lower thermostats to see what you find. In an ideal world, they would be comparable. Otherwise (i.e., lower thermostat value = 0.00, higher thermostat value = 1.00), the lower thermostat is usually invariably faulty, as is the upper thermostat. Before you finish, you might want to consider replacing the lower thermostat.

Step 8. Adjust the thermostats.

  1. I recommend that you adjust the thermostats before proceeding with the

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