NOVELTY - Hydrogen gas and oxygen gas are combusted in a chamber at elevated pressure to produce superheated steam at high temperature. Superheated steam is collected and heat is recovered from the superheated steam. At least some of the superheated steam is condensed to produce fresh water (10).    USE - Production of fresh water. Uses include but are not limited to drinking, food preparation, bathing, washing clothes and dishes, flushing toilets, watering lawns and gardens, fresh water for hotels, restaurants, office buildings, and civilian and military institutions, processing, cleaning, transportation, dilution and cooling in manufacturing facilities of steel, chemical and paper, and in petroleum refining, production of electricity in thermoelectric power plants, irrigating pasture and horticultural crops, and fresh water for dairies, fish farms, and production of red meat.    ADVANTAGE - The method enables extraction of heat generated through combustion of hydrogen and oxygen and its use as energy input in another process, such as in generation of electricity. The generated electricity can be used internally in a plant, reducing the amount of external electricity which needs to be purchased, or to be sold to an external source resulting in a revenue stream. The combustor and heat exchanger are insulated to minimize the heat loss and maximize their efficiencies.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for system for producing fresh water, consisting of a hydrogen and oxygen combustor (3) operable at elevated temperature and elevated pressure for producing superheated steam under high temperature and pressure, a collector connected to the combustor for collecting superheated steam, and hermetically sealed to the combustor, and a high-temperature heat exchanger (5) for recovering heat from superheated steam.    DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart of the fresh water production method.    Compressors (1a,1b)    Storage tanks (2a,2b)    Combustor (3)    Heat exchanger (5)    Steam turbine (7)    Condenser (8)    Electrical generator (9)    Fresh water (10)