How to Flush a Tankless Water Heater

tankless water heater

Tankless water heaters have many benefits, making your life easier. Because of this, tankless water heaters are rapidly increasing in popularity.

To maximize the benefits of a tankless water heater, it needs to be flushed once a year. This blog teaches a quick and easy way to flush a tankless water heater. You also watch our video on how to do it here:

Anyone with the right tools can flush a tankless water heater. The tools you’ll need include a pair of pliers and a circulation pump. The pump will circulate the fluid through the inlet and outlet while the water is off.

The first thing you need to do is make sure there are valves for flushing. You have an inlet and an outlet because you want to go in the same direction as the water.

Next, you’ll need to turn off the isolation valves. Turning the valves completely isolates the tankless water heater from the house.

After you’ve isolated the water heater, you’re going to hook up the hoses. Washing machine hoses work great. Make sure the hoses are on tight so it doesn’t leak.

Next, take the other end of the cold water inlet hose and attach it to the discharge side of the circulation pump. You can tell the discharge side from the inlet side because the inlet side has a filter. Once it’s attached and snug, drop it into the bucket.

For the hot water side, all you have to do is drop it in the bucket to create a closed-loop system. The chemical in the water will pump through the system and go up through the heat exchanger. This cleans the calcium and magnesium build up inside the heat exchanger.

In your bucket of water, add the chemical cleansing agent. Now, open the inlet and outlet valve to open the flow path. All you have to do now is plug it in and let it circulate for 30 minutes.

One thing to do before deciding to flush your tankless water heater is to make sure it has flush valves. It’s important to shut off the water to the rest of the house so the chemical doesn’t go through the entire system.

Now that you’re done circulating, unplug the pump so there’s no more chemical going through it. You’ll want to close the valve on the cold side that lets the chemical in and loosen the hose so it drains back down into the bucket.

Next, pour out the bucket so you can flush the system. Open up the cold inlet valve to the water heater so you can flush it out with fresh water. Do this three or four times, then run a pH test on the water to make sure everything is good.

Now that everything is flushed, close the control valve and turn the water back on to the house. Now everything is set and good. That’s all there is to it.

An important thing to remember is to be careful. Tankless water heaters heat water very rapidly. The water coming out will get hot, so be careful when filling the bucket. You also need to protect yourself to make sure you don’t get any chemical from the water on you.

If you want to save money, the trick is to use vinegar instead of the chemical. However, if using vinegar, let it circle for about an hour and a half to two hours.

As you can see, flushing a tankless water heater isn’t hard to do. Learn to do this, and you’ll be the go-to in your neighborhood.

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