Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
Selector switch set to CH/DHW position
Boiler DHW thermostat set to MAX
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the burner to ignite and run on DHW.
With a flow rate at the tap of approximately 14.3 litres/min is there a temperature rise of approximately 35° C and is the performance satisfactory?
Note:
Flow rates less than that stated above will produce a greater temperature rise.