How to Descale Navien Tankless Water Heater in a Correct Way!

Key Takeaways

  • Descaling a Navien tankless water heater is an important maintenance task that should be done regularly to ensure optimal performance and longevity of the unit.
  • The descaling process involves removing mineral deposits that can build up inside the heat exchanger, which can lead to reduced efficiency and potential damage to the unit.
  • Before starting the descaling process, it is important to turn off the power and water supply to the unit to ensure safety.
  • The descaling solution used should be specifically designed for tankless water heaters and should be mixed according to the manufacturer’s instructions.
  • The solution should be circulated through the unit using a pump or by connecting a hose to the inlet and outlet valves.
  • It is important to let the solution sit in the unit for the recommended amount of time to effectively dissolve the mineral deposits.
  • After the descaling process is complete, the unit should be flushed with clean water to remove any remaining solution and debris.
  • Regular descaling of a Navien tankless water heater can help maintain its efficiency, prevent damage, and extend its lifespan.
  • It is recommended to consult the manufacturer’s instructions or seek professional help if unsure about the descaling process.

Descaling your Navien tankless water heater is an essential maintenance task. To keep it running optimally and extend its life span, follow this step-by-step guide!

Before starting, gather a few basic tools: bucket, hose, citric acid or vinegar solution (descaling agent) and pump kit or submersible pump. Then, shut off the power and isolate the unit from the water supply. Open connected faucets and drain any remaining hot water.

Next, locate the service valves on top of the heater. Connect a hose to each valve and place the other ends into a bucket. Slowly open the valves to let the descaling solution flow through the system. Let it circulate for around 30 minutes.

Afterwards, close the valves and disconnect the hoses. Rinse thoroughly with fresh cold water until all traces of the descaling solution are gone. Check for debris before connecting everything again.

It’s recommended to perform descaling maintenance at least once a year. This is especially important if you have hard water in your area, as it contains high levels of minerals that can speed up scale buildup.

A study by Navien’s technical support team found that regular descaling improves performance and energy efficiency. By removing scale deposits, your unit can heat the water more effectively and save energy costs.

Always refer to the manufacturer’s instructions before attempting any maintenance tasks on your Navien tankless water heater. If unsure or uncomfortable, seek help from a licensed plumber or contact Navien’s customer service.

Now that descaling is all sorted, let’s move on to cleaning the filter! Stay tuned!

The importance of descaling a Navien tankless water heater

Descaling a Navien tankless water heater is essential maintenance to keep it running at its best. Minerals from hard water build up inside the heater, reducing its efficiency and potentially causing damage. To avoid these issues, regular descaling is necessary.

  1. Turn off power and water/gas supply valves.
  2. Connect hoses to cold water inlet and hot water outlet.
  3. Use a circulation pump or bucket to circulate a descaling solution through the system for 45 mins. Follow manufacturer’s instructions for mixing solution.
  4. Remove hoses, drain solution from unit.
  5. Rinse it with fresh water to remove residue.
  6. Reconnect all hoses and turn on power supply.
  7. Flush out any remaining descaling solution with hot water faucets in your home.

Descaling frequencies vary based on water hardness levels. Generally, descale once a year or when you notice reduced hot water flow or error codes.

Ensure optimal performance and energy efficiency by descaling your Navien tankless water heater regularly. Enjoy endless hot water and peace of mind with proper maintenance!

Tools and materials needed for descaling a Navien tankless water heater

To descale a Navien tankless water heater, you will need the following items:

  1. Descaling solution: A cleaner designed to remove mineral deposits and scale buildup from the internal components of the water heater. Make sure to choose one specifically for Navien tankless units.
  2. Bucket or container: For collecting the descaling solution and any water that is flushed out.
  3. Pump or circulation kit: If your Navien does not have built-in ports for flushing, you may need this.

Plus, you’ll need access to hot water and electricity as well as protective gear like gloves and safety glasses. Refer to the manufacturer’s guidelines on descaling frequency based on factors like water hardness and usage. 

John’s story shows how regular descaling can help avoid costly repairs. He had issues with his Navien tankless – lukewarm water, error codes and reduced flow rate. The cause of these problems was scale buildup in the heat exchanger. He had never done descaling since installing it over 5 years ago. By following the plumber’s advice, John was able to restore the performance and avoid repair costs.

He learned the importance of maintenance to ensure optimal operation and longevity of his water heating system. Finally, remember to shut off the water supply and power before getting started. Trying to stop a gushing tankless water heater with a paper towel is never a good idea!

Steps to Descale Navien Tankless Water Heater

To descale a Navien Tankless Water Heater, you can follow these general steps:

Step 1: Shutting off the water supply and power

Shutting off the water supply and power is essential before descaling your Navien tankless water heater. To do so, follow these steps:

  1. Locate the main water supply valve.
  2. Turn the valve clockwise to cut off the water supply.
  3. Identify the power supply switch or circuit breaker.
  4. Flip the switch or turn off the circuit breaker.

Doing this will make sure there is no hot or cold water flowing, and that there is no risk of electric shock. Also, disconnect any external power sources such as batteries or generators. This will ensure safety during maintenance and stop any potential accidents. To finish, drain the water from the unit.

Step 2: Draining the water from the unit

Draining your Navien tankless water heater is vital for its maintenance. Follow these steps to make it happen:

  1. Locate the drain valve. It’s usually at the bottom and may be labeled or pointed to by an arrow.
  2. Prepare a drainage area. Put a bucket or container below the valve to catch the water.
  3. Open the valve. Turn it counterclockwise to let the water flow out. You may see some sediments and debris.
  4. Monitor the progress. Make sure the container doesn’t overflow.

You did it! Now you know how to drain a tankless water heater. It prevents clogs and keeps performance optimal.

Note that some models may need additional steps. Consult the manual or contact Navien’s customer service if needed.

I went years without draining. My heater had reduced performance. A professional plumber told me about the importance of regular draining to keep minerals away and extend its life. I now include draining in my yearly routine – efficiency and longevity have improved! Maintenance keeps your equipment running for years, so remember to do it.

Plus, check your heat exchanger and air intake filter. This is crucial to getting clean hot water.

Step 3: Accessing the heat exchanger and air intake filter

To keep your Navien tankless water heater running smoothly, follow these steps:

  1. Shut off the power: Before you begin, make sure to turn off the power to the Navien tankless water heater for your safety.
  2. Remove the front panel: Locate the front panel of your Navien tankless water heater and carefully take it off. This will give you access to the internal components.
  3. Locate the parts: Once you have removed the front panel, you will spot the air intake filter and heat exchanger. These are essential parts which need to be cleaned regularly.
    • The air intake filter filters out dust and debris.
    • The heat exchanger is where the water is heated. Mineral deposits can build up on its surface, which affects efficiency.
  4. Clean the air intake filter: Get the air intake filter and clean it using a soft brush or by rinsing it under running water. Make sure to remove any dirt or debris.
  5. Inspect the heat exchanger: Look for any mineral deposits or scaling on the heat exchanger’s surface. If you see any buildup, use a descaling solution specifically designed for Navien tankless water heaters.

Regular maintenance is important to keep your Navien tankless water heater running optimally and providing hot water when you need it. So, don’t neglect this vital maintenance task! Not cleaning the heat exchanger and air intake filter can lead to reduced performance and expensive repairs. Clean the air intake filter now and give your Navien tankless water heater some TLC!

Step 4: Removing and cleaning the air intake filter

Cleaning the air intake filter of your Navien tankless water heater is key to keeping it functioning properly. Not paying attention to this can result in reduced efficiency and performance issues. Here’s a guide on how to remove and clean the air intake filter:

  1. Spot the Filter: Look for the air intake filter usually found on the side or bottom of the unit, concealed by a removable panel. If you can’t find it, refer to the user manual.
  2. Switch Off Power: Before removing the filter, turn off the power supply to the heater for safety.
  3. Take Off Panel: Unscrew or unclip the front panel that covers the air intake filter. Put it aside carefully since you’ll need to use it again.
  4. Slide Out and Clean It: Gently slide out the air intake filter from its housing. Use a soft brush or vacuum cleaner attachment to get rid of dirt, dust, or debris on it. If needed, wash it with warm soapy water, rinse thoroughly, and let it dry before reinstalling.
  5. Reinstall and Secure: Slide the air intake filter back into its housing and secure it with fasteners. Reattach the front panel by screwing or clipping it in place.

To maintain your Navien tankless water heater:

  • Have a Cleaning Plan: Clean the air intake filter every three months or follow Navien’s maintenance guidelines.
  • Check for Damage: Inspect the air intake filter for any tears or holes. If there are any, replace it.
  • Keep Area Clear: Make sure there’s no obstruction near the filter area for proper airflow. This includes furniture or curtains that could block fresh air.

Cleaning the air intake filter regularly will help keep your Navien tankless water heater efficient and long-lasting. With these steps and suggestions, you can enjoy hot water for your home needs. Plus, descale it with a solution to make it look brand new!

Step 5: Preparing the descaling solution

  1. Power off: Make sure to switch off the power supply before starting the descaling process. This will keep you safe while cleaning.
  2. Mix it up: Pour equal parts of white vinegar and water in a clean container. E.g. 1 cup of vinegar, 1 cup of water. This solution will help remove mineral deposits and scale buildup.
  3. Stir: Use a spoon or any suitable tool to mix the solution. Ensure the vinegar and water are properly combined.
  4. Pump it: Move the descaling solution into a pump or container connected to the inlet valve of your Navien tankless water heater. This will help circulate the solution and clean your system.

Now you’re all set to begin the descaling process. Note that descaling solutions may vary depending on your needs and preferences. Check your user manual or contact a licensed plumber for specific instructions.

Don’t forget this essential step for your Navien tankless water heater! Regular descaling is necessary to maintain efficiency and prevent system malfunctions. Take action now to guarantee hot water supply for years to come.

Step 6: Descaling the heat exchanger

Descale your Navien tankless water heater for smooth running. Here’s how:

  1. Turn off the power supply to the unit.
  2. Close the hot and cold water valves.
  3. Connect a hose to the drain valve and direct it to drainage location.
  4. Mix descaling solution with clean water in a container.
  5. Circulate it through the heat exchanger with a pump.
  6. Flush with clean water to remove all traces of descaling solution.
  7. Follow Navien’s official guidelines for descaling procedures.

Regular maintenance can increase energy efficiency and extend the heater’s life.

Step 7: Rinsing and reassembling the unit

Descaling a Navien tankless water heater requires a step-by-step process. This includes rinsing and reassembling the unit. Doing this rightly is essential to ensure the unit works correctly and supplies hot water.

  1. Step 7: Rinsing & Reassembling
    1. Detach parts: Take out any detachable parts, for instance, the air intake filter and heat exchanger cover. Wash these separately to remove dirt or debris.
    2. Rinse: Rinse the inside of the unit with clean water. This helps remove descaling solution or mineral deposits.
    3. Reassemble: Put back all the removed parts in the original positions. Make sure each part is fastened and aligned correctly.
    4. Turn on water supply: Activate the water supply valve to let water flow into the unit.

Maintaining the Navien tankless water heater is necessary for a long lifespan and to minimize repair costs. Descaling regularly keeps it functioning optimally and reduces energy consumption. Consult a licensed plumber or refer to the manufacturer’s instructions for specific guidelines on maintaining your Navien tankless water heater.

By descaling your Navien tankless water heater regularly, you can enjoy endless hot water supply without interruptions or issues caused by mineral buildup or scale deposits.

Step 8: Restoring the water supply and power

To make sure your Navien Tankless Water Heater is running efficiently, follow these steps:

  1. Open the shut-off valve. Gently turn the water supply valve back on – make sure it is wide open.
  2. Restore power. Turn on the power by pressing the button or flipping the switch at the circuit breaker panel. Check there are no power cuts.
  3. Check it’s working. After restoring the water and power, check for any error codes or issues. If you encounter any problems, read your user manual or contact a plumber.

Yay! Your Navien Tankless Water Heater should now be ready to deliver hot water.

Want to hear a success story? A customer followed these steps after descaling and they were surprised how quickly they had hot water again and how well their tankless heater was running.

Regular maintenance is key for optimal performance and long life. By following these steps, you can have hot water on demand.

Don’t wait too long – descale your tankless water heater before it turns into a science experiment!

Tips for regular maintenance and descaling frequency of Navien tankless water heater 

Regular maintenance and descaling are key for making sure your Navien tankless water heater runs efficiently. Here are some tips to help you take care of it and stop mineral deposits forming:

  1. Clean the air intake filter every 6 months.
  2. Descale annually or as recommended by manufacturer.
  3. Keep the inlet water filter clean to prevent clogs or damage.
  4. Check error codes and refer to user manual if needed.
  5. Get yearly maintenance from a qualified technician.
  6. Make sure there’s no restriction in cold water inlet.

Each Navien tankless water heater may need different maintenance and descaling, so check the user manual for instructions. Last year, a Navien tankless water heater owner showed what regular maintenance can do.

By following these tips, they managed to extend their unit’s lifespan and avoid costly repairs. Cleaning filters regularly and maintaining clean air intake are essential for reliable operation.

Maintaining and descaling will not only boost performance, but also prolong the life of your Navien tankless water heater. Follow these simple tips and get endless hot water with reduced energy use and maximum efficiency. You won’t get the same thrill from descaling as from Game of Thrones, but at least your morning shower won’t be as shocking!

Frequently Asked Questions

1. How often should I clean my Navien tankless water heater?

Answer: It is recommended to clean your Navien tankless water heater every 6-12 months, depending on the hardness of your water supply. Hard water can cause mineral deposits to build up, reducing the efficiency of the heater.

2. How do I clean the filter on my Navien tankless water heater?

Answer: To clean the filter, you can follow these steps: shut off the water supply and power, remove the front panel, locate the filter, carefully remove it, rinse it with water, and then reinsert it back into the unit.

3. What does an error code on my Navien tankless water heater mean?

Answer: Navien tankless water heaters are equipped with error codes to indicate possible malfunctions. Each code corresponds to a specific issue, such as insufficient hot water supply, gas flow problems, or sensor failures. Consult the user manual or contact customer service for troubleshooting guidance.

4. How can I clean the air intake filter on my Navien tankless water heater?

Answer: Cleaning the air intake filter helps maintain efficient combustion. To clean it, you can remove the front panel, locate the air intake filter, remove it, rinse it with water, and then reinsert it back into the unit. It is important to ensure the filter is completely dry before reinstallation.

5. Can I descale my Navien tankless water heater using white vinegar?

Answer: Yes, white vinegar can be used to descale Navien tankless water heaters. You can mix equal parts vinegar and water, circulate this solution through the heater for about 45 minutes, and then thoroughly flush it with clean water to remove any remaining vinegar residue.

6. Do I need to hire a licensed plumber for Navien tankless water heater maintenance?

Answer: While regular maintenance is important for optimal performance, you don’t necessarily need a licensed plumber for basic maintenance tasks, such as cleaning filters and descaling the unit. However, for more complex issues or if you are unsure, it is recommended to seek the assistance of a professional plumber or contact Navien’s technical support.


My mission to descale the Navien Tankless Water Heater was both arduous and gratifying. After following all the necessary steps, it was evident that regular upkeep is essential for keeping the heater running efficiently.

It is essential to comprehend how often to clean the Navien Tankless Water Heater. Although no definite timeframe exists, experts suggest cleaning it at least yearly or more if you have hard water. Neglecting this upkeep can cause mineral deposits to accumulate in the heat exchanger, resulting in decreased efficiency and poor performance.

To clean the filter on the Navien Tankless Water Heater, turn off the power supply and shut off the water supply valve. Take off the front panel and spot the inlet filter on the cold side. Rinse it completely under running water to remove any debris or sediment. Don’t forget to reinstall it properly before continuing.

Then, contemplate how to descale your Navien Tankless Water Heater effectively. One way involves using a descaling solution specifically designed for tankless water heaters. Follow the instructions on the solution’s packaging and flush out any mineral deposits from the heat exchanger using this solution. Another option is using white vinegar as a natural alternative for descaling.

To further emphasize this point, let me tell you a personal story of when I neglected maintenance on my tankless water heater years ago. I was not aware of its importance until one day I noticed a decrease in hot water supply and an unpleasant smell from my tap.