Abstract: A prefabricated, self-supporting, modular radiating panel with a sandwich structure comprises a layer of plasterboard and a layer of heat-insulating material. The plasterboard layer incorporates, internally, several continuous pipes which are designed to form independent hydraulic circuits and the end portions of which emerge all along a same edge of the panel. The independent hydraulic circuits are each housed in adjacent modular zones of the panel, the zones being separable from one another so as to provide panel parts of different sizes in a modular manner.