Set Appliance State:

Turn Hot Water Tap On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the appliance to run with a DHW demand.
Measure the temperature of the DHW at the outlet of the appliance (as shown by the red arrow) and also at a DHW tap.
Are the temperatures roughly the same or is there a large discrepancy?