Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
Selector switch in OFF position
CH temperature selector to minimum
DHW temperature selector to maximum
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Turn the selector switch to the water heating position.
With a flow rate of approximately 11.9 litres a minute, is there a temperature rise of 35 deg C? Is the operation satisfactory?