Polystyrene radiant wall and ceiling panel equipped with aluminium diffusers and internal manifold, 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. The internal circuits are made of polyethylene with an oxygen barrier and the internal dynamic distribution lines allows for flexibility and the simple connection of panels using universal fittings. The final finishing with plasterboard or similar material takes place separately at a later time.