Abstract: Ceiling radiators for the heating or cooling of rooms, with a compact design preferably made of a powder-coated, X- or similar shaped, aluminum, extruded profile. The radiator is of light weight and has high resistance to deformation, and is available up to 12 meters in overall length, with a maximum circular diameter up to 350 mm. The radiator includes a heating pipe having four curved radiant surfaces integrally molded to the pipe, with attachment rails. The heating-pipe ends are equipped with internal screw threads for tube connections and pipe compensators. In one economical design, a directly-heated radiant pipe has twelve radiant surfaces arranged around it on six radiant plates, and includes four attachment rails. The invention produces a broad, all-round radiation on the surrounding room surfaces and furnishings, so that heat encirclement is produced with optimum comfort to people underneath it.