Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
CH/HW switch in HW position
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Is the flow rate and temperature rise satisfactory?
Flow rate should be 9.6 L/min (2.1 G/min) at 35 deg C temperature rise.