Abstract: A hydrogen generator and methods of generating hydrogen are described in which a hydride is hydrolyzed in a reaction chamber in an exothermic reaction by the addition of liquid water to be vaporized in the reaction chamber, and/or the added water is controlled in relation to the hydrogen generated according to a value x defined by equations, which, for a divalent metal, reads: MH2+xH2O?(2?x)MO+(x?1)M(OH)2+2H2, wherein M symbolizing the divalent metal and x is preferred in the interval of 1.2 to 1.3. The equation as well as the values of x depend on the sort of hydride, i.e. whether a 1-, 2-, 3- or 4-valent hydride is applied. The hydrogen generator has a reaction chamber and an operably coupled water storage vessel acting also as condenser for recycled water.