How To Clean A Noritz Tankless Water Heater? 3 Easy Steps!

Are you ready to learn how to clean a Noritz tankless water heater? The first thing to do is close the gas valve and the hot and cold water valves. Open the drain valves and connect hoses to the isolation valves to the hot and cold watersides. After cleaning the inlet filter, combine the cold water hose with a submersible pump inside a five-gallon bucket. Plug the pump and wait for an error code to appear on the display panel. Place the solution of choice and run it for 30 to 45 minutes. After that, you can go ahead and flush out the solution from the heater, and you are done.

Depending on the quality of water that you are using, the recommended frequency of cleaning your Noritz tankless water heater varies. You must clean your tankless water heater at least once a year minimum if you don’t want to deal with more complicated issues or more hectic cleaning. This guide will teach you exactly how you can maintain your water heater’s efficiency quickly and easily. Read this article until the end to learn more about this topic. Enjoy and have fun!

how to clean a Noritz tankless water heater


Why Clean A Noritz Tankless Water Heater?

A Noritz tankless water heater is cleaned because of the mineral build-up that collects over time inside the heater. This problem affects the heating efficiency of the heater and might even cause problems if left unchecked. The sediments could coat the inside of the heater, making it harder for the water to be heated. This cleaning process is also called descaling or flushing because of the limescale and calcium. When these minerals from the water we use gather in large amounts, it could cost you money. 

It could lead you to get a new unit and severely shorten the life of your water heater. Also, you would have to spend more on electricity bills because of poor heat flow, and your gas would run out quicker. The procedure won’t take the whole day. If you are intimidated by doing it yourself, you can ask someone to do it for you. The more frequent the water heater is cleaned, the better it is for its durability.

This cleaning process should be done more than once a year if you use hard water as your source. You do not have to worry because you will need a bucket, a submersible pump, two hoses, and a descaling solution. You can also use white vinegar as a substitute for the descaling solution. The steps for the cleaning procedure are elaborated on below. Continue reading if you want to know how to clean a Noritz tankless water heater.


Steps To Clean A Noritz Tankless Water Heater

Always remember to read the owner’s manual first if you can. Reading the manual will make it easier for you to follow these steps because of the slight variations that different Noritz tankless water heaters have. If you are not confident with doing the cleaning procedure yourself, you can always call someone to help you. The steps below are generalized, carefully read the steps below and apply them to your situation.


Step #1. Cleaning preparation

The first step is to close the gas valve hot and cold main water valves. Drain the heater by connecting the hoses to the hot and cold sides and opening the drain valves. Place the other end of the hoses in a five-gallon bucket to collect the water coming out. Next, clean the inlet filter if your tankless water heater has one that is easily accessible. 


Step #2. Working with the solution

The second step is to connect the end of the cold water hose to the pump. Ensure that the pump and the end of the hot water hose are inside the bucket. Then fill the bucket with water to submerge the pump. Plug the pump and wait for the water heater to display and error code “11”. At this point, you can pour in the solution and leave it for 30 to 45 minutes.


Step #3. Rinsing and wrapping up

The final step is to remove the solution inside the heater, disconnect the hoses and close the cold water drain valve. To remove the solution, attach a hose to the hot water drain valve and put the other end to a sink. Open the cold water supply valve, which will flush the solution out of the system to the sink. After allowing around 20 gallons of water out, you are done. It may also be a good idea to read about tankless electric instant water heater.


It’s A Wrap!

Thank you for reading this article until the end. Your time and effort are very much appreciated. Hopefully, you can use this knowledge of how to clean a Noritz tankless water heater in the future. Never forget to prioritize safety over anything else and look at the bigger picture to decide which options would lead to better efficiency overall in both time and resources. It’s best to also know what is the advantage of tankless water heater and how hard to install tankless water heater. We look forward to helping you again in the future. Take care!

Leave a Comment