Stainless Steel boiler is a closed vessel used to heat fluid, usually water. It is not necessary for the liquid to boil. The heated or vaporized fluid exits the boiler for use in a variety of processes or heating applications, including cooking, sanitizing, heating water and central heating. Typically, a boiler pressure vessel is constructed of steel (or alloy steel), though previously, wrought iron was also used. Due to corrosion and stress corrosion cracking, stainless steel, especially austenitic kinds, is not utilized in wetted components of boilers.