The Importance Of Flushing And Cleaning Your Tankless Water Heater

The Importance Of Flushing And Cleaning Your Tankless Water Heater

Posted by Eccotemp Systems LLC on February 18, 2016



   Every manufacturer of tankless water heaters recommends regular cleaning and maintenance, and flushing if necessary. Due to the hard water, especially from the well, the heater might develop lime and mineral deposits on heater's elements. Sediment build-up is especially dangerous in narrow water passages as it might clog the element and prevent further normal heating operation.


Why flushing is important

One of the most important elements is the heat exchanger, which has those narrow water passages. Flushing tankless water heaters whose heat exchangers are blocked by the lime scale is very important and must be done as a preventative measure before any clogging occurs.

If you don't flush the water heater, the heat exchanger can be damaged as not enough water will pass through and cool it down. Any damage which is related to lime scale build-up is not covered by the warranty.

How To Flush Your Tankless Water Heater

As said, flushing tankless water heaters is not complicated, and once done properly you have to reset the fault code by resetting the power. Here are the step by step instructions (We will consider that isolation or service valves are installed):

  • Turn the power OFF (electricity and gas) to your tankless heater.
  • Close the shutoff valves on hot and cold water lines.
  • Use the service (isolation) valve and connect the Flow-aide system to the cold water line (garden hose is OK). The circulation pump within the flow-aide system is used to force the flushing solution through the heater.
  • Now connect the heater with the hose, by using another service valve and terminate it to the appropriate drain bucket.
  • Drain hose and pump hose should end in the same bucket as the flow-aide system.
  • Open both service valves.
  • Run the circulation pump and let the flushing solution go through the unit for one hour approximately.
  • Turn the pump OFF.
  • Rinse the cleaning solution from the water heater by opening the shutoff valve on the cold water line (close the service valve between the pump and the heater) so it runs through the heater and into the bucket (approximately 5 mins.) After that open the shutoff valve on the unit and close the service valve between the heater and the bucket.
  • Disconnect all hoses.
  • Recommendation is also to clean the in-line filter.
  • Resume the power and run the water heater.

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