It is an MCS requirement that there will be a prevention for bacterial growth such as legionella. This is due to the low temperatures associated with heat pumps and solar thermal and it is at these temperatures where bacteria can grow within the system. 

Therefore, the system will need to have regular bursts of a higher temperature to kill any bacteria within the system.  The software will give you the ability to select your chosen cycle for the immersion to come on and for how long. This will also have an effect on your running costs under the immersion section. If you require further advice on how often Legionella Purge’s should be set, please consult your heat source manufacturer.

For any further questions please speak to your Mentor on Freephone 01244 784 260 or email [email protected]