The Baxi door combustion box within the combustion chamber is a sealed box within the heating appliance that contains the burner, electrodes, etc. It also holds all of the toxic gases and enables the fan to extract them using the flue.
Comes with electrodes
Technical specification
Compatible WithHE 100, HE Plus ISS 02 100/2, HE Plus 50/2, HE Plus 80/2 and System 100 HE Plus ISSSupplier Part Number720012201Brand NameBaxi