Abstract: A heater, especially an auxiliary motor vehicle heater, with a burner in a combustion chamber (2) which is surrounded by a generally pot-shaped, die cast heat exchanger (4) which has inner and outer parts (5, 6) and between which an intermediate space (11, 12) is formed through which a heat exchange medium flows, the combustion gases emerging from the combustion chamber (2) being discharged via a exhaust outlet connection (23). To increase the heat transfer efficiency and to minimize the size of the heater, on the outside of the open end of the heat exchanger inner part (5) a ring (15) is provided which projects, spaced apart from the outer peripheral wall (7) of the inner part, toward the bottoms (8, 10) of the heat exchanger parts. The intermediate space (11, 12) continues from between the peripheral walls (7, 9) of the inner and outer heat exchanger parts to between the ring (15) and the peripheral wall (7) of the inner part (5).

Abstract: The invention relates to an air heating device with a hot air fan located in a housing to deliver hot air from an air inlet opening which is located on the face side via a heat exchanger to a hot air exit opening located on the opposite face.The object of the invention is to devise an air heating device which can always intake a sufficient amount of hot air regardless of its installation position without additional parts.This object is achieved by the fact that the housing near the face air inlet opening on its outside periphery on at least one side has additional air inlet openings.