A radiant heating assembly for use with systems for heating an enclosed space by circulating a fluid through a closed tubing arrangement is provided. The inventive radiant heating assembly is made up of a radiant heating panel and tubing. The radiant heating panel is made up of a radiant heat transfer plate having a length and center line, and an elongated C-shaped or side opening receptacle that extends along the center line of the plate for receiving the tubing. A plurality of depressions extends along an inner surface of the C-shaped receptacle that interfaces with the plate. The tubing conforms to these depressions, thereby allowing the radiant heating assembly to achieve greater radiant heat dissipation capacity and efficiency.