Radiant wall and ceiling panel with mineral wool insulating equipped with aluminium diffusers and specific crosspieces for the screws anchoring, produced in various sizes and formats to meet a wide array of application needs. The panel can be customized in its materials and configuration based on customer specifications, it can have different pitches depending on the required thermal outputs and equipped with areas without internal circuits for easy insertion of ceiling lighting fixtures. The internal circuits are made of polyethylene with an oxygen barrier and protrude directly from the panel allowing flexibility and quick connection. The panels of various sizes are connected to the distribution system by pipes that comes out of the sides by means of RAYFIT fittings.