Abstract: A radiant plaque heater adapted primarily for overhead use comprises the combination of a combustion panel, an emitter panel, and a combustion product flue wherein combustion products flow across the emitter panel in the direction of the flue and heat the latter to produce radiation which supplements that emitted by the combustion panel.

Abstract: Radiant tube space heating appliance includes a burner assembly (12), air flow therethrough being induced by a fan (14) by way of a restricted air inlet orifice (34) communicating with a stabilizing chamber (32) leading to the burner head (26) for smoothing and silencing the air flow; the burner head including a flame stabilizing matrix (40), conveniently formed from windings of flat and corrugated stainless strips (42,43) which define through apertures of substantial axial length. The appliance may further include a turbulator insert (50) in the radiant tube formed as a corrugated strip (52) of stainless steel or similar material which is twisted to form a helix.