A radiating heating module for a tunnel kiln for continuous-cycle firing of ceramic products such as tiles, slabs, bricks, sanitary appliances and the like, which advance on a roller plane located internally of the tunnel, in which tunnel the heating means are of a radiating type, characterised in that it comprises a pair of parallel radiant tubes, each comprising at an end thereof a free flame burner, combustion gases of which flow along the tube, and at an opposite end thereof a heat exchanger crossed by the combustion gases, the two radiant tubes being reciprocally orientated in an opposite direction so that the end of the tube of each pair comprising the burner is adjacent to the end of the other tube of the same pair comprising the heat exchanger, the comburent air conduit of the burner of a tube comprising the adjacent heat exchanger located at the end of the other tube.