A boiler system consists of two main parts: the furnace, which provides heat, and the boiler proper, a device in which the heat changes water into steam.
When 100% of the steam produced is returned to be reused, the system is called a closed system. Examples of closed systems are closed steam heating, hot water heating, and "one-pipe" systems. Since some processes can contaminate the steam, it isn't always desirable to feed the condensate back into the boiler. A system that doesn't return the condensate is called an open system.
Domestic boilersIn the case of a domestic boiler, steam is distributed via pipes to steam radiators, or hot water is distributed via baseboard radiators or radiant floor systems, or can heat air via a coil. Steam boilers operate at a higher temperature than hot water boilers, and are inherently less efficient, but high-efficiency versions of all types of furnaces and boilers are currently available.
Related category• BOILERS
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