Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap On
Selector switch set to DHW
DHW temperature control set to MAX
Preheat switched OFF
Attach temperature clamps to flow and return pipes
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow appliance to operate for hot water and reach temperature.
Monitor the temperature differential across flow and return pipes.
Expected temperature differential approximately 28°C or less.
Note.
Flow rate no greater than 14.5 litres/min.