what is boiler

A boiler is a closed vessel that heats a liquid, such as water, to create steam or the vaporized form of a liquid. The steam or hot water is then circulated via a piping device to transport heat for a range of purposes, including heating, power generation, and other processes. Boilers are used to heat homes using steam and radiant heat techniques. They can also be used to heat potable water. There are different types of boilers, including fire-tube boilers and water-tube boilers. Fire-tube boilers are often characterized by their number of passes, referring to the number of times the combustion gases flow the length of the pressure vessel as they transfer heat to the water. Watertube boilers are used where high steam pressures are required. Boilers are an extremely versatile and important piece of equipment.