A Steam generator is a device used to boil water to create steam. More specifically, it may refer to:
Boiler (steam generator), a closed vessel in which water is heated under pressure Heat recovery steam generator Monotube steam generator Supercritical steam generator or Benson boiler, a high-pressure steam generator that operates in the supercritical pressure regime, such that no boiling takes place within it. Steam generator (auxiliary boiler), a steam-powered boiler used on ships to produce a low-pressure steam, heated by a high-pressure steam supply rather than a flame. Steam generator (boiler), an oil- or gas-fired boiler, based on a low-water content monotube coil. Steam generator (nuclear power), a heat exchanger in a pressurized water nuclear reactor. Steam generator (railroad), a device used in trains to provide heat to passenger cars.