Steps to Take When Flushing Out a Tankless Water Heater

Steps to Take When Flushing Out a Tankless Water Heater

To maintain your water heater, it’s important to flush it out regularly. This is especially important because calcium compounds and minerals tend to build up in pipes, which can damage the heat exchanger.

Regularly flushing out tankless water heaters is highly recommended. This gets rid of buildup, scale and removes contaminants. Alongside other maintenance tasks (i.e. corrosion protection), flushing this device can make your heater last longer and reduce operational and maintenance costs. Listed below are the steps you should take when flushing out a tankless water heater.

  • First, cut off your water heater’s power source (gas/electricity), and ensure you’ve fully turned off the power supply.
  • Once this is complete, turn off the main water supply and the main hot water supply valve.
  • Next, turn off the cold water isolation valve followed by the hot water outlet isolation valve.
  • Connect one end of a hose to your sump pump’s outlet and the other to your cold water isolation valve.
  • Connect another hose to the hot water isolation valve, and ensure both are firmly attached.
  • Then, place the pump and the hose connected to the hot water valve in a five-gallon bucket. Fill the bucket with white vinegar.
  • Open both the heater’s hot water and cold water isolation valves, and turn on the pump. Let the vinegar pump for 45 minutes, and then turn off the cold water isolation valve.
  • Next, dispose the vinegar and replace the hose from the hot water isolation valve into the bucket.
  • Turn on the water supply valve and let water flow to the bucket for about five minutes. Then, close the main cold water supply valve and disconnect the hoses.
  • Afterwards, turn off your hot water isolation valve. Remove the inlet’s filter screen before cleaning and reinstalling it as per the manual.
  • Next, turn on the hot water supply and the cold water supply valves. Open a few faucets to get rid of any air in the pipes, and then close them.
  • Ensure there are no leaks. Finally, turn on your water heater’s power, and check your faucets for hot water.

If you want to learn more about flushing tankless water heaters, contact Aggressive Mechanical Contractors. Our technicians serve the residents of Monmouth County and the surrounding area.

Our goal is to help educate our customers in Monmouth County, New Jersey and surrounding areas about energy and home comfort issues (specific to HVAC systems).

Credit/Copyright Attribution: “Ivelin Radkov/Shutterstock”

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