I’ve added clarifying questions to the form:
1. Does the system have a back up heater installed and in use (this is an inline electric element that can top up the heat pump output mostly for space heating):
If this is ticked, an option becomes visible in the metering section to ask if it is metered.
2. There is a specific question in the hot water legionella section to ask if the cycle uses an immersion heater, this then if ticked enables the metering option to indicate if metered.
3. In metering section, if an immersion heater and backup heater is present the options to indicate if these are metered appear:
There’s also an option to indicate if secondary pumps are metered if you have hydraulic separation selected earlier in the form.