The invention relates to a heating module comprising a resistive heating element placed in a frame. The heating module constitutes a ready heating subassembly for heating a gas or a liquid, in particular for heating the air. The heating element is mounted to the frame by means of the at least two contacts arranged at opposite side walls of the heating element, wherein each contact comprises at least two brackets releasably coupled to a side wall, and at least one resilient element connected to the brackets and to at least one catch releasably coupled to the frame, wherein each resilient element, arranged in contact with a side wall of the heat ing element, is tensioned and exerts an expanding force acting on the connection of the contact with the frame and the heating element.