NOVELTY - A radiant burner (11) having gas permeable zone to promote flame less combustion of fuel, is provided with the combustion chamber. The radiant burner is designed such that angle of radiation is predominantly incident upon the surface of tubular reaction chamber (8).    USE - For producing hydrogen containing gases used in residential and small commercial application, from hydrocarbon feedstock.    ADVANTAGE - Hydrogen rich product gas having less than 10 ppm carbon monoxide is produced using a compact endothermic catalytic reaction apparatus. The apparatus offers rapid load-following response, high thermal efficiency and low pressure operation.    DETAILED DESCRIPTION - A hairpin tubular reaction chamber (8) packed with catalyst (9), is arranged vertically within the combustion chamber to convert hydrocarbon to industrial gas by reaction with steam. The upper portion of reaction chamber is surrounded by a convection chamber to enhances transfer of heat from combustion products to reaction chamber. The tube in the hairpin tubular chamber has outer diameter ranging from 3/8 inches to 4 inches preferably from 3/4-2.5 inches. The mass velocities of the hairpin tubular reaction chamber ranges from 200-3000 lb/ft2/h, preferably from 400-1500 lb/ft2/h. The average diameter of the catalyst particle ranges from 1/16-3/4 inches, preferably from 1/4-1/2 inches and pressure drop ranges from 1-8 psi. The inlet operation pressure ranges from 0-20 psig, preferably from 2-10 psig. The exit temperature of the tubular chamber ranges from 1000-1700degreesF and preferably from 1200-1400degreesF. The tubular reaction chamber has capacity to generate hydrogen plus carbon monoxide product in volumetric quantity ranging from 20-1000 SCFH, preferably from 25-600 SCFH and to generate hydrogen plus carbon monoxide in the range of 25-150 SCFH. The radiant burner operates at combustion intensity typically ranging from 100000-500000 Btu/ft2/h, preferably from 150,000-350,000 Btu/ft2/h. An INDEPENDENT CLAIM is also included for fuel processor which has desulfurizer vessel, endothermic catalytic reaction apparatus and steam generator. A single vessel for successive stages of the water-gas shift reaction vessel, is integrated with the steam generator. A compact preferential oxidation reactor decreases the carbon monoxide concentration to less than 10 ppm. A control system is provided to control the entire fuel processor.    DESCRIPTION OF DRAWING(S) - The figure shows the fuel processing system.    Tubular reaction chamber (8)    Catalyst (9)    Radiant burner (11)