NOVELTY - A hydrogen generator (100) consists of source (108) of water, source of alkali metal hydroxide, source (104) of aluminum, pump(s), a reaction chamber (102) having inlet(s) and outlet(s), a waste reservoir (118) separated from the reaction chamber, a control system to control a flow rate of the liquid that is pumped into the reaction chamber through inlet (A). The source of aluminum is separated from the source of water. The reaction chamber is arranged to receive aluminum, alkali metal hydroxide and water by inlet(s) and aluminum is received by the reaction chamber separate from water.    USE - Hydrogen generator is used for generating hydrogen for consuming apparatus e.g. fuel cell, combustion engine, turbine, diesel engine, automobile, truck, emergency vehicle, construction equipment, inboard boat motor, outboard boat motor, ship, barge, locomotive, motorcycle, bicycle, semi-truck, submarine, farming equipment, forklift, helicopter, rocket, garbage truck, bus, wheel chair, industrial engine, power unit e.g. back-up power unit and industry alternative power unit, emergency generator and military equipment and heat for interior of building, water material, cabin of vehicle, interior of tent, interior of temporary component, or engine (all claimed).    ADVANTAGE - The hydrogen generator provides safe and efficient hydrogen source on demand when needed, at atmospheric pressure without the need of expensive compressed or liquid hydrogen. The fueling mechanism in the generator is totally safe and inert to be stored anywhere economically. The generator generates hydrogen through recovery of reactants which reduces the cost of electrical power and transportation of reactants.    DETAILED DESCRIPTION - A hydrogen generator consists of source of water, source of alkali metal hydroxide, source of aluminum, pump(s), a reaction chamber having inlet(s) and outlet(s), a waste reservoir separate from the reaction chamber, a control system to control a flow rate of the liquid that is pumped into the reaction chamber through inlet (A). The source of aluminum is separated from the source of water. The inlet(s) is separated from the outlet(s). The reaction chamber is arranged to receive aluminum, alkali metal hydroxide and water by inlet(s) and aluminum is received by the reaction chamber separate from water. The pump (A) of the pump(s) provides a liquid to the inlet(s). The liquid comprises water and/or solution comprising mixture of water and alkali metal hydroxide. Aluminum, alkali metal hydroxide and water are combined in the reaction chamber to cause a chemical reaction that gives hydrogen, heat, and a waste solution. Hydrogen and the waste solution come out from the reaction chamber through outlet(s). The waste reservoir receives the waste solution by outlet (A) of outlet(s) and the waste solution is received as a product from chemical reaction. The pump(s) pump the waste solution out of the reaction chamber through outlet (A). The flow rate controls the amount of hydrogen output by the chemical reaction with respect to demand for hydrogen by a consuming apparatus. An INDEPENDENT CLAIM is included for generation of hydrogen.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of hydrogen generator.    Hydrogen generator (100)    Reactor or reaction chamber (102)    Aluminum source (104)    Water source (108)    Waste reservoir (118)