How to Reset a Stiebel Eltron Tankless Water Heater

If your water heater stops working or delivers inconsistent hot water, you may need to reset the thermal safety cutouts. This is a simple procedure that you can do yourself by following these steps:

Stiebel Eltron is a German company that produces high-quality heating appliances, including tankless water heaters. These water heaters are energy-efficient, compact, and easy to install. However, sometimes they may encounter some issues that require resetting the unit.

One of the common problems that may cause your Stiebel Eltron tankless water heater to malfunction is the tripping of the thermal safety cutouts. These are devices that protect the water heater from overheating by cutting off the power when the temperature exceeds a certain limit.

If your water heater stops working or delivers inconsistent hot water, you may need to reset the thermal safety cutouts.

Steps to Reset a Stiebel Eltron Tankless Water Heater

Step 1: Turn off the power and circuit breaker

Before you open the front cover of the water heater, make sure you turn off all the circuit breakers connected to the unit. This will prevent any electric shock or damage to the water heater.

Step 2: Remove the cover panel

To access the thermal safety cutouts, you need to remove the front cover of the water heater. To do this, unscrew the nut on the right side of the unit and pull out the cover.

Step 3: Locate the reset buttons

Inside the water heater, you will see two copper heating canisters with wires attached to them. On top of each canister, there is a small button that is the reset button for the thermal safety cutout. You may need a flashlight to see them clearly.

Step 4: Press the buttons until they click

Using a non-conductive tool such as a pencil with an eraser, press each reset button until you hear a click. This means that the thermal safety cutout has been reset and is ready to work again.

Step 5: Close the cover and restore the power

After resetting both buttons, close the front cover of the water heater and secure it with the nut. Then, turn on all the circuit breakers connected to the unit and check if your water heater is working properly.


Here are some frequently asked questions about resetting a Stiebel Eltron tankless water heater:

Q: How do I know if my thermal safety cutouts are tripped?

A: If your thermal safety cutouts are tripped, your water heater will not produce any hot water or will deliver inconsistent hot water. You may also see an error code on the digital display of your water heater.

Q: What causes my thermal safety cutouts to trip?

A: The most common cause of thermal safety cutouts tripping is a power surge or outage that affects your water heater. Other possible causes include low water pressure, clogged filters, faulty wiring, or defective heating elements.

Q: How often do I need to reset my thermal safety cutouts?

A: Ideally, you should not need to reset your thermal safety cutouts often. If they trip frequently, it may indicate a more serious problem with your water heater that needs professional attention.

Q: How can I prevent my thermal safety cutouts from tripping?

A: To prevent your thermal safety cutouts from tripping, you should maintain your water heater regularly by cleaning or replacing the filters, checking for leaks, and ensuring proper ventilation. You should also avoid overloading your water heater by running too many appliances at once or using too much hot water.

Q: What are some other features of Stiebel Eltron tankless water heaters?

A: Stiebel Eltron tankless water heaters are known for their energy efficiency, advanced flow control, and easy installation. They also have a digital display that shows the temperature and error codes, a robust steel casing that protects them from damage, and a variety of models that suit different needs and preferences.


  • vikram-2-1 How to Reset a Stiebel Eltron Tankless Water Heater

    My name is Vikram and I have a genuine passion for plumbing and faucets. I've spent countless hours researching and experimenting with different techniques and products to find the most effective solutions for common plumbing problems. My goal is to share my knowledge and experience with homeowners, so they can save time, money, and stress by tackling plumbing issues themselves.

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