Technical Articles

FAQ - How do I flush the heat exchanger?

Flushing or De-scaling is part of the regular maintenance of a Noritz heater.  It involves circulating a solution of pure vinegar or dilute CLR through the heat exchanger using a submersible pump.  You will need the following equipment to conduct a de-scale:

  • Bucket
  • Submersible pump
  • Isolator valve kit (installed on heater)
  • Water line connections (the isolator valves have a 3/4" hose thread connections on their flush ports)
  • Descaling solution (vinegar, dilute CLR, dilute lime-away)

For complete step by step instructions, please see the attached instruction manual.

Applicable Models
  • Models: ALL MODELS
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