How To Flush Out A Tankless Water Heater

Tankless water heaters don’t have tanks, so there is nothing to flush out. Instead, you need to periodically clean the heat exchanger to remove scale and sediment buildup.

How To Flush Out A Tankless Water Heater

Tankless water heaters require a specific type of flushing in order to remove any sediment that may have built up over time. The manufacturer’s instructions will provide the specifics, but generally you will need to shut off the water supply, open the faucet nearest the tankless heater, and then drain the water using a garden hose. After all the water has drained, close the faucet and turn on the water supply. Open the faucet again and let the

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  • Locate the cold water intake valve and turn it off
  • Attach a garden hose to the drain valve at the bottom of the tank
  • Open the hot water tap to release pressure in the tankless water heater

below – Tankless water heaters usually have a small screen on the inlet side of the unit. This screen can become plugged with scale and sediment over time, which will reduce the performance of the heater. – To keep your tankless water heater running at its best, it’s important to flush it out every six months or so. This involves removing the screen and flushing out all of the built-up sediment and scale. – Make sure you have a bucket to catch


Frequently Asked Questions

Can I Flush My Tankless Water Heater Myself?

Tankless water heaters cannot be flushed by homeowners. Only a professional with the proper tools and knowledge should flush a tankless water heater.

How Long Does It Take To Flush A Tankless Water Heater?

Tankless water heaters are designed to provide a continuous flow of hot water to your fixtures. This means that there is no need to wait for the tank to fill up with hot water before you can use it. Tankless water heaters do not store hot water, so the amount of time it takes to flush one will depend on how much hot water you are using at the same time.

How Do You Flush Out A Tankless Hot Water Tank?

The best way to flush out a tankless hot water tank is to run the hot water until it is clear.


In Summary

Tankless water heaters should be flushed every 3-5 years, depending on the manufacturer’s recommendations. Flushing removes any built-up sediment or scale from the unit, which can decrease efficiency and shorten the life of the heater.

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