I’ve been trying out the legionella risk assessment iAuditor template in a couple of our properties. A number of the properties have thermostatic mixer showers. The mixed ‘hot’ on these showers will not rise above 45deg C for safety reasons. The hot supply pipe is concealed in the wall, so cannot be measured directly.
The risk assessment requires the water temperature to reach at least 50deg C.
What is the advice when testing these types of showers?