Abstract: The room heating arrangement is provided with a radiation tube, connected to a pressure and mixing chamber casing 1, a pipe line system arranged above the room to be heated, the radiation tube being connected, on the one hand, to a return flow chamber 19 with fan 10 and, on the other hand, to a mixing chamber 20 with a flame tube 14 surrounding a burner 2. The pressure and mixing chamber casing 1 is constructed in double-worm form, two cylindrical parts 26, 27 forming the casing and a front and back plate 3, 4 presenting the double-worm form, while the connecting tubes 18, 21 for the radiation tube are connected to the back plate 4. The burner 2 and the drive unit 5 for the fan 10 are arranged on the front plate 3.