1. GAS BURNER APPARATUS FOR USE IN A FIREBOX, SAID APPARATUS COMPRISING A PAIR OF SPACED PARALLEL SUPPORT BARS, A SPREADER BAR EXTENDING BETWEEN THE SUPPORT BARS TO MAINTAIN THE SPACING THEREBETWEEN, THE ENDS OF THE SUPPORT BARS LYING IN A PLANE AND FORMED TO BE SUPPORTED TO DISPOSE THE PLANE IN PARALLEL CLOSELY SPACED RELATION ABOVE THE BOTTOM OF THE FIREBOX, A BURNER ASSEMBLY SUPPORTED TO EXTEND BETWEEN THE SUPPORT BARS, SAID BURNER COMPRISING AN ELONGATED VANE LYING GENERALLY IN A PLANE TIPPED AT A MODEST ANGLE TO THE HORIZONTAL AND DISPOSING ONE SIDE EDGE ABOVE THE OTHER, SAID SIDE EDGES EXTENDING TRANSVERSELY OF SAID SUPPORT BARS, A SERIES OF BURN HOLES IN A LINE ALONG THE UPPER EDGE OF THE VANE AND BENEATH THE PLANE OF THE VANE FOR DISCHARGING GAS TO BE BURNED THEREAT, AN ELONGATED GAS MANIFOLD EXTENDING ALONG THE UPPER SIDE EDGE OF THE VANE AND IN GAS COMMUNICATION WITH SAID BURN HOLES TO SUPPLY SAME WITH A MIXTURE OF AIR AND FUEL GAS, MEANS FOR MIXING AIR AND FUEL GAS AND FOR FEEDING THE MIXTURE TO SAID MANIFOLD, AND VALVE MEANS DISPOSED TO CONTROL THE FLOW OF FUEL GAS TO SAID MIXING MEANS, THE ANGLE OF THE PLANE OF SAID VANE AND THE ADJACENCY OF THE LOWER SIDE EDGE THEREOF WITH RESPECT TO THE BOTTOM OF THE FIREBOX SERVING TO CAUSE AIR TO BE DRAWN UPWARDLY BENEATH THE VANE TOWARD THE BURN HOLES WHEN SAID BURNER IS IGNITED.