A Boiler.
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A boiler or steam generator is a device used to create steam by applying heat energy to water. Although the definitions are somewhat flexible, it can be said that older steam generators were commonly termed boilers and worked at low to medium pressure (1–300 psi/0.069–20.684 bar; 6.895–2,068.427 kPa), but at pressures above this it is more usual to speak of a steam generator. An industrial boiler, originally used for supplying steam to a stationary steam engine
A boiler or steam generator is used wherever a source of steam is required (e.g. sterilizer source of steam, source of heat for hospital HVAC system, etc.)
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