NOVELTY - A heat-and-gaseous-fuel generator comprises a static control tube interconnecting two chambers containing water and reductant substance, respectively, to provide feedback control for controlling the reduction reaction, with increasing hydrogen pressure in the second chamber forcing water from the second chamber back into the first chamber.    USE - The generator is used for the production of hydrogen gas in remote locations, where electrical power is unavailable, for use as cooking fuel, fuel for heaters, fuel for generators, and fuel for distilling water. It can be used in marine environments for producing fuel for driving boats and ships, and the water produced by combustion of the hydrogen gas may be recovered for various other uses, including for steam to drive turbines or to cook fish. It is used for remote recreational applications, including lighting, battery charging, cooking, heating recreational vehicles, and may be packaged into small, self-containing canisters for campers, hikers, mountain climbers, and other such outdoor enthusiasts to supply heat, fuel, and clean water. It can be used for organizations, e.g. hospitals, businesses, fire departments. Sodium hydroxide and aluminum metal have extremely long half-life, no toxic by-products are produced, and there are no moving parts or electromechanical systems to fail or degrade, so that the heat-and-gaseous-fuel generator is extremely robust and reliable over long periods of time. The hydrogen gas from the generator can be used for lighter-than-air vessels, e.g. hydrogen balloons and zeppelins, for fueling motorized vehicles, directly, or through hydrogen fuel cells, for agricultural uses, including gas-driven pumps, grow-lamps, feeders, and humidifiers.    ADVANTAGE - The invention is commercially feasible, environmentally safe, and non-hazardous heat and power sources for remote applications and for residential, individual, and small-business applications. The rate of heat removal can be controlled by increasing the flow of water or other heated liquids or gasses through the heat exchanger. The rate of reduction of water to hydrogen is decreased.    DETAILED DESCRIPTION - A heat-and-gaseous-fuel generator (100) comprises a first chamber containing water; a second chamber containing a reductant substance, into which water from the first chamber is introduced in order to be reduced, by an exothermic redox reaction, to produce hydrogen gas; and a static control tube interconnecting the chambers (102, 104) to provide feedback control for controlling the reduction reaction, with increasing hydrogen pressure in the second chamber forcing water from the second chamber back into the first chamber, thus decreasing the rate of or stopping altogether the redox reaction.    An INDEPENDENT CLAIM is also included for a method for producing heat and gaseous fuel comprising introducing an aqueous sodium-hydroxide solution into a first chamber of a heat-and-gaseous-fuel generator; introducing metallic aluminum into a second chamber of a heat-and-gaseous-fuel generator; opening a formula-feed control valve to allow aqueous sodium-hydroxide solution to flow from the first chamber to the second chamber to initiate the reduction of water by aluminum to produce hydrogen gas and heat; and opening a static control tube interconnecting the first chamber with the second chamber to provide feedback control that controls reduction of water by the metallic aluminum.    DESCRIPTION OF DRAWING(S) - The figure shows a front view of the heat-and-gaseous-fuel generator.    Generator (100)    Chambers (102, 104)    Pressure relief valves (106, 108)    Formula-feed tube (112)    Formula-feed control valve (114)