PTC HEATER FOR AN AIR CONDITIONING SYSTEM, IN PARTICULAR OF A MOTOR VEHICLE

The invention relates to a PTC heater (1) for an air conditioning system, in particular of a motor vehicle, - having a plurality of heating devices (2) which are arranged in a stack-like fashion one on top of the other in a stacking direction (S), - wherein each heating device (2) comprises a plurality of electric PTC heating elements (3) which are arranged in a sandwich-like fashion in the stacking direction (S) between a first carrier (4a) and a second carrier (14a, 14b), wherein a fin structure (5) is arranged between every two heating devices (2) which are adjacent in the stacking direction (S), on which fin structure (5) a first carrier (14a) of a heating device (2) and a second carrier (14b) of a heating device (2) which is adjacent in the stacking direction (S) are supported, - having a supporting frame (8) which is made of a plastic, surrounds the plurality of heating devices (2) and is embodied as a single-piece injection moulded part.