Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
Boiler On/Off Switch ON
DHW Temperature Control to Max
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

With DHW Flow Rate approx 7.5 l/min (1.65 gals/min)
is the temperature rise approximately 45 deg C?