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A boiler is a closed vessel in which drinking water or other fluid is heated. The fluid will not boil. (In North America, the term "furnace" is normally used if the purpose is never to boil the liquid.) The heated or vaporized fluid exits the boiler for use in a variety of heating or procedures applications,[1][2] including water heating, central heating, boiler-based power era, cooking food, and sanitation. Materials The pressure vessel of the boiler is usually manufactured from steel (or alloy steel), or of wrought iron historically. Stainless steel, especially of the austenitic types, is not used in wetted elements of boilers credited to corrosion and stress corrosion breaking.[3] However, ferritic stainless is often found in superheater sections that will not come in contact with boiling water, and electrically heated stainless steel shell boilers are allowed under the Western "Pressure Equipment Directive" for creation of steam for sterilizers and disinfectors.[4] [url=https://en.wikipedia.org/wiki/Boiler]https://en.wikipedia.org/wiki/Boiler[/url] In live steam models, copper or brass is often used since it is easier fabricated in smaller size boilers. Historically, copper was often used for fireboxes (particularly for vapor locomotives), due to its better formability and higher thermal conductivity; however, in newer times, the high price of copper often makes this an uneconomic choice and cheaper substitutes (such as steel) are used instead. For much of the Victorian "age group of vapor", the only material used for boilermaking was the best grade of wrought iron, with set up by rivetting. This iron was extracted from specialist ironworks, such as at Cleator Moor (UK), observed for the high quality of their rolled plate and its own suitability for high-reliability use in critical applications, such as high-pressure boilers. In the 20th century, design practice shifted towards the use of steel instead, which is stronger and cheaper, with welded buildin