A pre-heater arrangement is available, operated with the combustion gas-air mixt. This arrangement comprises a gas burner arranged at the entry end of the burner or a pre-mix burner (14) arranged in the burner, the combustion gases of which transmit their heat via a heat exchanger wall to the combustion gas-air mixt. in the catalytic burner area.The gas burner or the pre-mix burner (14) is fed with the combustion gas-air mixt. and is automatically cut off from feed of the mixt. when the adequate operating temp. of approximately 300-350 deg.C for combustion of the combustion gas-air mixt. is reached.
