Heating apparatus and housing for a heating apparatus

A heating apparatus, in particular, an auxiliary heater and/or a parking heater for a motor vehicle, with a one-piece or one-part housing (2) that contains a combustion chamber shaft (3), in which a heat transfer casing (8) is arranged, wherein the inner side (9) of said heat transfer casing encloses a combustion chamber (5) and is subjected to hot exhaust gases during the operation of the heating apparatus (1), wherein the outer side (11) of the heat transfer casing forms the inner envelope of a cooling fluid space (10), through which a cooling fluid flows during the operation of the heating apparatus (1), wherein the outer envelope of said cooling fluid space is formed by the inner side (12) of the combustion chamber shaft (3), and wherein the housing (2) also contains a catalyst shaft (4), in which at least one catalytic element (15) is arranged through which hot exhaust gases flow during the operation of the heating apparatus (1) and characterized by the fact that the catalyst shaft (4) being offset and parallel with respect to combustion shaft (3) is arranged downstream of an exhaust gas outlet (26) of the combustion chamber (5).