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Cleansing cycle

Learn what the cleansing cycle is, how it works, and what affects cleansing behaviour across different heat sources.

The cleansing cycle is a built-in safety feature that protects water quality. Cleansing periodically heats the tank to a higher level to reduce the risk of legionella bacteria. This is done by fully heating the tank so that even the coldest part—the bottom—reaches a pasteurising temperature. By default, the system ensures this happens at least once every two weeks.

Customising the cleansing cycle

You can customise the schedule if the defaults don’t suit your routine. Using the top right hand menu, got to 'Tank Settings' and scroll down to 'Cleansing'. 

  • Cleansing Temperature: The recommended range depends on the model. We suggest the following:
    • Mixergy X / Solar X: 51°C - 60°C
    • iHP X: 51°C - 55°C
  • Cleansing Start: Set time to start cleanse.
  • Cleansing Days: Set day/s to cleanse.

About the Cleansing Cycle

Why is it Heating to 100% ?

Heating to 100 % ensures the entire usable volume of the tank reaches a safe temperature. 

Your Mixergy cylinder automatically runs cleansing cycles to help protect against legionella bacteria. This is done by fully heating the tank from top to bottom so that even the coldest part reaches a pasteurising temperature.

By default, the system ensures this happens at least once every two weeks.

Why the Cleansing Cyle may be Interrupted 

As the cleansing cycle requires the cylinder to heat up to 100%, it may be interrupted before it can finish. This may be caused by: 

  • Another heat source interrupts heating
  • The required temperature cannot be reached 
  • The heat source becomes unavailable 

The system will try again automatically at the next opportunity. 

Why Boost is Unavailable During Cleanse 

Boost is disabled during cleansing to avoid conflicting heating instructions. Normal heating resumes once cleansing completes. 

How to Choose Your Cleanse Day 

You can select a preferred day and time for cleansing in the app. Many users choose a time when higher hot water demand is expected. 

Differences Between Heat Sources During Cleanse 

Heat sources behave differently during cleansing: 

  • Boilers may complete cleansing faster 
  • Heat pumps and iHP X systems may take longer 
  • Immersion heating may be used as a fallback 

These differences are normal and depend on system design.