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Boiler
Closed vessel in which fluid is heated / From Wikipedia, the free encyclopedia
A boiler is a closed vessel in which fluid (generally water) is heated. The fluid does not necessarily boil. The heated or vaporized fluid exits the boiler for use in various processes or heating applications,[1][page needed][2][page needed] including water heating, central heating, boiler-based power generation, cooking, and sanitation.
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(preserved, Historic Silver Mine in Tarnowskie Góry Poland).
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(United States).
See also: Furnace (central heating) and Condensing boiler