Make sure to disable any existing Legionella cycle that’s already programmed in your heat pump controller. This avoids overlapping schedules, which can cause unnecessary hot water runs and wasted energy.
Yes, you can schedule a recurring set point of say 55°C or even 60°C (depending on heat pump brand) once a week in the Havenwise app.
Why are some brands limited to 55°C?
Some models cannot achieve above 55°C reliably, especially most Samsung and Mitsubishi units. Going higher usually forces the immersion heater to switch on, which is very inefficient and costly.
What's different about those models?
It's the type of refrigerant used in the heat pump - any R32-based models physically cannot achieve the flow temperature required for tanks warmer than 55°C. R290 heat pumps can.
Do I even need a Legionella cycle?
Maybe not. Heat Geek have an excellent video discussing this: