How to build hydrogen generator for gas stove?

You could also use sodium and water to make hydrogen. Recharging a lead acid battery will also release hydrogen. All that you need is a 6 inch water column of pressure for the stove, and pipe the hydrogen into the regulator for the stove. You might need to change the orifice jets for the burners however. A better method of fuel production, however, would be to use the anaerobic digestion of cow or pig manure to produce methane (natural gas), pipe that through a jar of calcium water (powdered limestone), to absorb the CO2, and a jar filled with steel wool to get the sulfur dioxide, and then on into the stove, or what ever else you are going to use to burn the gas in. Hydrogen is nice, but it can be tricky. It is also a lot easier to make methane than it is to make hydrogen. The older issues of Mother Earth News had several plans for producing methane.