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Is Cleaning A Tankless Water Heater Necessary?

cleaning a tankless water heater

Tankless water heaters have become a popular option for homeowners looking to save money on their energy bills and have an endless hot water supply. Like any other appliance, tankless water heaters require routine maintenance to ensure they function efficiently. Is cleaning a tankless water heater necessary? The short answer is, yes! 

One of the most essential aspects of maintaining a tankless water heater is cleaning it. Mineral build-up and deposits can clog the system and reduce its lifespan, leading to costly repairs. This article will discuss the steps to clean your tankless water heater effectively. We will cover everything from the tools you’ll need, the cleaning solutions to use, and helpful tips to keep your tankless water heater in excellent condition. So, let’s get started!

Is Cleaning A Tankless Water Heater Necessary?

If you own a tankless water heater, you may wonder whether you need to clean it regularly. After all, tankless water heaters are designed to be low-maintenance and long-lasting. However, like any appliance, a tankless water heater can benefit from routine maintenance, and cleaning is an integral part of that.

The primary reason to clean a tankless water heater is to remove mineral build-up. When water flows through the heat exchanger in a tankless water heater, minerals such as calcium and magnesium can accumulate on the walls of the exchanger. Over time, this can create a layer of scale that reduces the heater’s efficiency and can even cause it to fail.


Benefits of Cleaning a Tankless Water Heater

There are several benefits of cleaning your tankless water heater. Here are a few of the top reasons you should maintain a clean tankless water heater:

-Extending the lifespan of your heater

-Keeping it running efficiently

-Saving money on energy bills

-Having an endless supply of hot water

-Reducing the risk of costly repairs

-Improving safety

How to Clean a Tankless Water Heater

Tankless water heaters are popular because of their energy efficiency and convenience. However, like all appliances, they require occasional maintenance to ensure they work at their best. Cleaning your tankless water heater is an essential part of routine maintenance that can help extend the life of your appliance, improve its efficiency, and ensure its hygienic operation. Here are some steps to follow to clean your tankless water heater:

1. Turn off the heater: The first step in cleaning your tankless water heater is to turn off the power and gas supply to the heater. This will prevent any accidents or damage to the heater during the cleaning process.

2. Isolate the heater: Next, you need to isolate the heater from your water and gas supply systems. You can do this by locating the cold water and hot water isolation valves and turning them off.

3. Drain the water: Once the heater is isolated, drain all the water from the system. You can use a submersible pump or a garden hose to remove the water from the heat exchanger.

4. Clean the heat exchanger: The heat exchanger is the most critical component of your tankless water heater and requires special attention during cleaning. You can use food-grade vinegar to remove any mineral deposits or build-up that may have accumulated over time. Mix equal parts of water and vinegar in a 5-gallon bucket and use a pump or hose to circulate the solution through the heat exchanger for an hour or two.

5. Rinse the system: Once the vinegar solution has been circulated through the heat exchanger, you must rinse the system thoroughly to remove any residual vinegar or minerals. Fill a bucket with fresh water and pump or circulate the water through the system for around 30 minutes.

6. Reconnect the system: Once the system has been rinsed adequately, it’s time to reconnect the cold water and hot water valves and turn on the gas or electricity supply.

7. Test the system: Finally, turn on your hot water taps and check for any signs of leaks or malfunctions. If the heater is functioning correctly, check the water temperature to ensure it is operating at its optimal capacity.

Regular cleaning of your tankless water heater is a small but significant step you can take to ensure that your appliance operates smoothly, efficiently, and hygienically. By following these simple steps and incorporating them into your routine maintenance plan, you can extend the life of your heater and enjoy uninterrupted hot water throughout the year.


In conclusion, properly maintaining and cleaning your tankless water heater ensures its longevity and efficiency. Neglecting routine maintenance could result in mineral build-up and decreased functionality, leading to costly repairs or replacement. By following the steps outlined in this guide, you can ensure that your tankless water heater continues providing hot water even in the coldest seasons.

Remember, turning off the power and gas supply before starting the cleaning process and isolating the heater from the water and gas supply systems is essential. Additionally, drain all the water from the system and clean the heat exchanger thoroughly using food-grade vinegar. Remember to rinse the system with fresh water before reconnecting the cold and hot water valves and turning the gas or electricity supply back on.

Finally, test the system after cleaning to ensure it functions correctly. Keep an eye out for any leaks or malfunctions, and consider checking the water temperature to see if the heater is operating at its optimal capacity. By following these simple steps, you can extend the life of your tankless water heater and save yourself money in the long run.

Call To Action For Water Heater Wiz

When it comes to keeping your home running smoothly, your water heater is one of the most essential appliances. But with so many options and potential hazards when it comes to tankless water heater maintenance, it’s important to turn to the experts for help.

That’s where Water Heater Wiz comes in. Our team of skilled technicians offers routine maintenance to keep your water heater functioning at its best and repairs and installations when it’s time for a replacement.

Don’t wait until your water heater is on the fritz to give us a call. It’s recommended to have your tankless water heater maintained every six months to prevent mineral build-up and other issues, and conventional water heaters should be serviced once a year. Water Heater Wiz offers routine maintenance appointments to fit your schedule and keep your water heater in shape.

If you’re experiencing any issues with your hot water supply, it’s important to call us as soon as possible. Waiting too long can lead to more serious problems and potentially dangerous situations. Our team can quickly diagnose the issue and provide the necessary repairs or replacements.

Don’t settle for an insufficient hot water supply. Keep your home comfortable and safe with the help of Water Heater Wiz. Give us a call today to schedule your routine appointment or emergency repair.

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