NOVELTY - The reformer for reforming fuel for fuel cells useful in household system, housing area, automobiles and airplanes for heat and/or current extraction, comprises a microwave radiation emitting process chamber (3) having a first section, which has an opening and a second section for the fuel, and a microwave source (2) for generating microwave radiation. The process chamber and the microwave source are mechanically connected together over an opening in the process chamber so that the fuel contained in the process chamber is reformable by the microwave radiation.    USE - The reformer for reforming fuel for fuel cells useful in household system, housing area, automobiles and airplanes for heat and/or current extraction.    ADVANTAGE - The reformer has good durability, ensures simple, flexible, efficient and reliable reformation of different types of fuels with less operating time without environmental pollution caused by soot and avoids formation of unwanted materials.    DETAILED DESCRIPTION - The reformer for reforming fuel for fuel cells useful in household system, housing area, automobiles and airplanes for heat and/or current extraction, comprises a microwave radiation emitting process chamber (3) having a first section, which has an opening and a second section for the fuel, and a microwave source (2) for generating microwave radiation. The process chamber and the microwave source are mechanically connected together over an opening in the process chamber so that the fuel contained in the process chamber is reformable by the microwave radiation. The sections are separated from the microwave source through a fuel resistant glass separation unit (4) permeable for the microwave radiation. The process chamber has an inlet (7) for the fuel, and an outlet (5) for the reformed fuel. The outlet has a microwave radiation emitting- lattice or porous body. A distributor for the fuel is arranged in the process chamber in the form of a non-woven. The process chamber has stainless steel walls. A catalyst is arranged for further treatment of the reformed fuel. The microwave source is a magnetron. INDEPENDENT CLAIMS are included for:    (1) a system having a reformer and a fuel cell; and    (2) a procedure for reforming fuel for fuel cells.    DESCRIPTION OF DRAWING(S) - The figure shows a reformer for fuel cells.    Microwave source (2)    Process chamber (3)    Separation unit (4)    Outlet (5)    Inlet. (7)