A radiation arrangement provides heat to a bed surface for accommodating a patient thereon. Heat sources are arranged at a spatial distance above the bed surface in such a way that uniform radiant warming of the bed surface is obtained and that sides of the bed surface are maintained clear of radiation to facilitate access by persons attending the patient so that these attending persons are not subjected to the radiant heat especially in the region of the head. The arrangement includes small-surface heat radiators which are located and spaced vertically above the corner points of a polygon border enclosing the bed surface.