What is the definition of a steam heating coil? A steam heating coil is a device that is used to heat a space through the use of steam. It is typically composed of a series of metal pipes, often copper, that are connected to a boiler. The boiler then produces steam and the steam is then directed through the pipes of the coil. The steam is then radiated outward to heat the surrounding environment. The steam heating coils are used in both residential and commercial settings, and are often found in areas such as factories, warehouses, and hospitals. Steam heating coils are also used in radiant floor heating systems, as the steam is able to quickly and evenly heat up the floor. In addition to this, steam heating coils can also be used to provide a certain level of humidity to the area. Steam heating coils are relatively easy to maintain, and they are also cost effective.