Abstract: A radiant heating system for installation or a subfloor. Header panels having arcuate cutouts are secured on the subfloor near opposite walls of a room. Spaced apart sleepers are secured to extend between the header panels and provide channels that receive radiant heating tubing. The cutouts are initially occupied by break away header plates which can be detached to allow the tubing to curve through the cutouts so that it can extend between the ends of adjacent channels. The cutouts can be inserted back into the cutouts to secure the tubing bends in place. Heat conductive panels overlie the sleepers and channels and can be overlaid with finished flooring.