Abstract: A radiant heater for heating the surrounding environment or for transferring heat therein to a remote location. In one embodiment the radiant heater comprises a plate provided with a series of interconnecting grooves in the surface thereof. Disposed in the grooves is either a wire for producing heat when an electric current is passed therethrough or a tube for conducting a fluid, the temperature of which may be greater than, equal to, or less than the temperature of the region surrounding the tube. The wire or tube may be confined within the grooves by a filter material occupying substantially the portion of the grooves not occupied by the wire or tube. In another embodiment, the radiant heater comprises a flat container for such wire or for conducting a fluid, which container is sandwiched between two plates. Several radiant heaters may be functionally interconnected.