NOVELTY - A hydrogen generator unit including compression unit for generating low-pressure hydrogen from water, comprises reaction chamber which is adapted to employ extracting chemical process to generate low-pressure hydrogen from water in exothermic reaction in cartridge-based system via heat exchanger (9), to provide heat source for thermal engine, where generator unit further includes arrangement associated with thermal engine for compressing generated hydrogen and controlling injection of compressed hydrogen into direct injection internal combustion engine or into fuel cell energy system (8).    USE - As hydrogen generator unit used as an auxiliary heating unit for use within electric vehicles (claimed); used in hydrogen fuelling systems for fuel cells and internal combustion engine standalone energy systems.    ADVANTAGE - The use of the hydrogen system reduces the cost of a vehicle utilizing battery packs. The use of an exothermic reaction to generate hydrogen, and a use of heat generated by the exothermic reaction via a thermal engine to compress the generated hydrogen is capable of providing a more appropriate supply of hydrogen.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for generating hydrogen from a hydrogen generator unit comprising: cartridge unit which includes fuel elements, and which is connected to a water storing unit, where the cartridge unit being operable to generate hydrogen; and an engine unit for receiving generated hydrogen from the cartridge unit; involving generator unit at least one heat exchanger for thermally coupling between the cartridge unit and engine unit; using the cartridge unit to support an exothermic reaction involving the fuel elements and water supplied from the water storing unit to generate the Hydrogen and also function as a heat source; and disposing of or recycling the fuel elements enclosed in the cartridge unit after use in the generator unit.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of an operational cycle of hydrogen generator unit.    Cartridge unit (1)    Engine unit (2)    Displacement cylinder (4)    Piston (5)    Flywheel (6)    Diaphragm pump (7)    Fuel cell energy system (8)    Heat exchanger (9)    Water collection unit (10)    Separate water storage tank (11)    Cooling water pump (12)