NOVELTY - Producing a hydrogen fuel product, involves providing hydrogen (H2) and an oxidant to a combustion chamber to form fuel gas mixture, the fuel gas mixture being ignited in the combustion chamber to produce energy and a heat of combustion byproduct; providing water; exposing a portion of the water to the heat of combustion byproduct to create steam; exposing at least a portion of the steam to a catalyst heated by the heat of combustion byproduct, the catalyst being chosen such that the catalyst, when heated, reacts with the steam to produce H2.    USE - For producing hydrogen fuel product (claimed).    ADVANTAGE - The steam exiting the boiler section can be used to drive a steam turbine at a power plant, in order to generate electricity. Thus, the excess waste heat produced by the method, can be used to create significant amounts of electricity from the waste steam by-product of the system and method. Additionally, the waste water or steam from the turbine can be returned to the exhaust duct, where it is further heated by the waste heat of the combustion reaction of the fuel mixture. The steam produced from water/steam exiting the turbine is combined with the steam waste product of the reaction and is passed over the catalyst of the exhaust duct. Thus, the system produces a usable hydrogen fuel gas from water, as well as produces significant amounts of electricity from a generator, without releasing harmful waste products or hydrocarbons into the atmosphere.    DETAILED DESCRIPTION - Producing a hydrogen fuel product, involves: providing a combustion chamber; providing hydrogen (H2) and an oxidant to the combustion chamber to form a fuel gas mixture in the combustion chamber, the fuel gas mixture being ignited in the combustion chamber to produce energy and a heat of combustion byproduct; providing water; exposing a portion of the water to the heat of combustion byproduct to create steam; exposing at least a portion of the steam to a catalyst heated by the heat of combustion byproduct, the catalyst being chosen such that the catalyst, when heated, reacts with the steam to produce H2. INDEPENDENT CLAIMS are included for the following:    (1) a device for producing a hydrogen fuel gas, comprising: a source of H2 gas; a source of an oxidant; a combustion chamber connected to the source of hydrogen gas and the source of an oxidant for receiving the hydrogen gas from the hydrogen gas source and an oxidant from the oxidant source in a certain proportion to form a fuel mixture, the combustion chamber including an ignition element for igniting the fuel mixture in the combustion chamber; a water source arranged to provide water to a region with a heat of combustion byproduct of the ignition of the fuel mixture in the combustion chamber to create steam. a catalytic converter section heated by the heat of combustion byproduct, the catalytic converter section including a catalyst being chosen such that, the catalyst, when heated, reacts with a portion of the steam to produce H2;    (2) a system for generating hydrogen gas, comprising: an internal combustion engine including a combustion chamber, the combustion chamber configured to receive H2 gas from a source of H2 gas and an oxidant from a source of an oxidant to produce a fuel mixture that, when ignited, produces energy and heat; a catalytic converter section containing a catalyst chosen such that the catalyst, when heated, reacts with steam to produce H2, the catalyst being arranged to be heated by heat produced from the ignition of the fuel mixture; the catalytic converter section arranged to receive steam from at least one of an output of the combustion chamber and a heat recovery output of the internal combustion engine; the catalytic converter having an output, where hydrogen gas produced from the reaction of the steam with the catalyst is output from the catalytic converter, with at least a portion of the hydrogen gas provided at the output of the catalytic converter being provided to the combustion chamber for ignition;    (3) a system for generating hydrogen gas, comprising: a combustion chamber including an input and an output; the input of the combustion chamber receiving a fuel mixture of hydrogen gas and an oxidant in a predetermined ratio; the output of the combustion chamber being in fluid communication with an exhaust duct; the exhaust duct including a catalytic converter section including a catalyst chosen such that the catalyst, when heated by exhaust, reacts with steam to produce H2; the catalytic converter section including a source of steam produced from water exposed to heat produced by the ignition of the fuel gas mixture in the combustion chamber; the catalytic converter section having an output, where hydrogen gas produced from the reaction of the steam with the heated catalyst is output from the catalytic converter section; and at least a portion of the hydrogen gas provided at the output of the catalytic converter section being provided as part of the fuel mixture to the combustion chamber for ignition.