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 9.7 l/min (2.1gals/min 1pint in approximately 3.5 seconds),
is there a temperature rise of 35 deg C?
Is the operation satisfactory?