TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Apparatus: The gas generator further includes a recovery chamber, a heat exchanger with inlet and outlet, and auxiliary circuit. The exhaust gases produced from the user are circulating in the recovery chamber through a centrifugal fan. The recovery chamber cooperates with an interspace (16) where gassy fluids from the hearth pass. The fluid contributes heat for the dry distillation of the fuel volatile parts. The recovery chamber also includes inner and outer finned tubes (53, 56) where the exhaust gases circulate and discharge through an aperture (20). The lower part includes a second recovery chamber for recovering combustible gas heat to super-heat the steam produced from machine exhaust. The super-heated steam is sent to the hearth where it is divided into hydrogen and oxygen. The second recovery chamber comprises annular interspaces to partially feed air, super-heated steam, and distilled volatile parts from the upper part to the hearth. The lower part further includes interspaces (37, 38) discharging the combustible gas, and accumulating produced carbon. A wall (44) having apertures is provided between an interspace (37) and the hearth. A part of the wall comprises truncated-cone rings, superimposed and distanced from each other, and fins forming vertical circular wall to facilitate the catalyzing reactions of nickel to where it is lined. The auxiliary circuit consists of conduits (29, 50, 52) for returning a part of combustible gas to the lower part, and a part of non-condensed volatile parts to allow a production of charcoal. The auxiliary circuit cooperates with a cooling device (51) to cool the carbon temperature to 95+100degreesC (sic). The heat exchanger comprises a burner (31) associated with the conduit to burn at least a part of produced non-condensed distillates in the upper part.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The walls in the lower part are made of nickel or lined with nickel.