On a house? Business? Aircraft Carrier?
Do you mean what is a steam boiler or what are steam boilers'? A simple steam boiler would be a container of water heated to the boiling temperature. The water will turn to steam, which is invisible, and if not contained, will turn to a visible cloud.
Steam boilers are used in homes and commercial buildings for heating and hot water. It is a pressurized tank with a heating element that raises the temperature of water to generate steam. The steam is then used for heating purposes. It is a cost-effective, efficient way to heat buildings and water. Newer steam boilers have gotten a lot smaller and more efficient.
