Tankless Water Heater Not Working After Power Outage

Tankless Water Heater Not Working After Power Outage: Power outage is a pretty common issue among tankless water heater. Sometimes it can solve with minor tweaks, but other times it can cause you a real problem. Tankless water heater not working after power outage_ it depends on many factors. For instance, it might be because of a faulty switchboard or tripped circuit breaker.

Before heading towards a solution. You have to know can a tankless water heater not working without electricity?

How Does A Tankless Water Heater Work?

Tankless water headset is a modern time luxury that people are enjoying. It works differently than the traditional water heater. For example, a traditional water heater stored water in it, and with the required energy, it continues the healing process.

Contrarily, the tankless water does not work in the same way. It will only come into action when the water starts flowing through the pipeline towards the heater.

From there, it will change the temperature by using gas and electrical power. As water moves through the heater, it will start producing hot water.

In this process, the prime thing to consider is electrical power. Without electrical power, tankless water did not work. You might be wondering, the leading power source for a tankless heater is gas.

Why it needs electricity? Well, it works by using a PC board that requires a sensor to starts the heating process. In this way, electricity played a vital role in the consistent output in the form of water.

Are The Tankless Water Heater Takes Time To Heat Water?

After a power outage, the first thing you have to make sure of is to give proper time to the water heater to give you hot water. The reason is pretty simple if you have used all the hot water before, then you must have given some time to the heater to take the output.

Tankless Water Heater Not Working After Power Outage

Now and then, if it is not an issue, you have to check for power supply problems. For instance, there might be some concerns regarding the power supply.

Power Supply

If a power outage is a common problem you are facing, you have to check the power supply of the tankless water heater. It might be the problem of partial power restoration. Sometimes after a power outage, some power has been restored, and it may cause you into a bigger problem.

For that matter, you have to do a circuit test by using a circuit tester. It will instantly highlight the problem and give you the idea of whether the heater is receiving power or not.

If, in any case, it is not receiving the power, you have to double-check the following issues.

Tripped Circuit Breaker and Burnt Wires

Due to an outage in electricity, your circuit breaker might have tripped. It is a common issue, and to address, this you have to push back the tripped circuit breaker into its original position. In this way, your water heater will start working correctly.

Similarly, because of a surge in electricity, your wire might be burn due to overheating. Sometimes, you might find wire cut out or chewed by small animals. Due to these orderly issues, your water heater will not start functioning.

To rectify this issue, you have to concern with the technicians to review your wire system.

Faulty Switchboard and Plug Issues

Another issue, you have to deal with the faulty switchboard where you provide the power to the water heater. It might have turned into a problem due to a lost connection.

After that, you need to ensure the plug between the power supply and the water heater is working accordingly. If it is not working, you have to unlock the plug and check all the wires.

Make sure to place them correctly if you did not have any idea how to resolve this issue. You have to call the electrician to comes and solve the problem.

After checking all these issues, if a tankless water heater does not start working, you have to check some additional issues.

Thermostat Malfunction and Voltage Problem

The first thing you need to address in the tankless heater is the thermostat function. Due to the outage of electricity, the thermostat might be crash, and it has to work accurately. To get this back into action, you need to reset it and bring it down to zero.

After this, you have to wait for a couple of minutes and chances are it will start working.

If the tankless water heater is not working after this, chances are you have to replace the thermostat due to malfunction. Voltage is also another issue because the water heater needs a certain level of voltage.

If your home electricity does not provide water heater required voltage. You have to check your home’s electricity and concern with an electrician to get it back to its normal state.

The Heating Element Burnt Out

If your water heater is older, then chances are heating elements have burnout. As the heater gets older, the heating elements started demolishing. In this way, you have to check it and replace it as soon as possible.

Reset Button Tripped

Due to outage of power, the water heater thermostat and heating element got affected. In this way, the heater reset button might have tripped off. To get it back, you have repressed the red color reset button and the tankless water system will start working respectively.

How To Prevent Power Outages?

The best way to prevent power outages is a battery backup system. All you have to do is to install a battery system in your tankless water heater. It is an inexpensive and effective way to get rid of a power outage.

In this way, when the power outage comes, the battery will provide the power to keep it running.

As a precaution, one thing you have to keep in mind. Do not cut the primary source of power because you have installed a battery as a backup, not just as the first electricity source.

The battery does not smash as much power as a leading source of electricity. So, it is a decent way to prevent the problems and keep consistent the water flow.

When To Call Professionals?

After analyzing the whole system, you might be thinking, what are the problems that I can solve? OR when to call professionals to solve the water tank issues?

Some scenarios will keep you aware that you can solve this problem.

  • No hot water: If there is no hot water, chances are you are running many things at the same time. For instance, you are using a dishwasher tap, shower, cloth washing tap at the same. That means you are exceeding the limits. In this way, you have to check it by yourself and solve the problem.
  • Water is too hot: IF you are experiencing the water is too hot, chances are you are overloading the system by using more taps. If this is not the issue, you have to reset the thermostat at 120 F.
  • Water flows like hot, then cold, and then hot again: If you are facing a problem like the water flows hot, then cold, and then hot again. You don’t need to call professionals because you can do it by yourself. To address this issue, you have to make sure no one has taken a shower right before you. Because in this scenario, the person used shower right before you have leftover some hot water. After that, the colder water will come because the water heater running the process of re-heating.
  • The water looks dirty and smells different: If this is the case, highly likely water heater got fungus and bacteria inside it. These are the possible reason for unclean and discolored water. To prevent this issue, you have cleaned it anyway. Moreover, if you have got rust-colored water coming from the tap, the chances are rust is built up in your unit, and your pipeline may have been damaged.

If you have fixed all those issues by yourself and still facing the problem with the water heater. Now you might consider the professionals that will get you out of these issues.


Will a Tankless Water Heater Work If The Power Goes Out?

-The tankless water heater did not work without electricity because they need a sensor provided by electricity. To keep the water flow and heating process consistent tankless water use a regulation power terminal. So, tankless water did not work if the power goes out.

Do Tankless Water Heaters Have a Reset Button?

-Yes, a tankless water heater has a red button on the thermostat of the tankless water heater. The button can vary according to the models. If you need to reset the water heater, please press the button, and it will go into reset mode.

Why is My Hot Water Not Working After The Power Outage?

-After the power outage, if the water heater is not producing hot water. The chances are it will not be getting power due to a circuit breaker or Thermostat Malfunction. First, you need to check and switch them back and forth to regain power.


By analyzing the whole system, you will know that power outage is not a problem anymore. The main issue that harms the tankless water heater is the power surge. When the power comes back and forth, it can destroy the water heater and its functionality.

Once the water heater gets into a problem, you have to spend more money to fix it. So, that is why battery backup is the best possible solution you can include in the system.

Moreover, you also have to make sure that the power system of your home is suitable and reliable. If this is the case, you have to concern with a professional electrician to get it solved ASAP. Hope this “Tankless Water Heater Not Working After Power Outage” post helps you.

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