Set Appliance State:

Mains Power Off
Gas Off
Turn Hot Water Tap On
Pre-heat switch OFF
DHW temperature set to maximum position
Gas On
Mains Power On

Measurement:

Open hot tap fully and set flow rate to approximately 10.8 ltr/min (2.4 galls/min).
Is the DHW operation satisfactory with a temperature rise of 35 degrees C at the hot tap?