Central heating
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A central heating system provides warmth to a number of spaces within a building from one main source of heat.
A condensing boiler
Hot water central heating unit, using wood as fuel
Ruins of the hypocaust under the floor of a Roman villa at La Olmeda, Province of Palencia (Castile and León, Spain)
Sylvester's warm-air stove, 1819
Boiler
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A boiler is a closed vessel in which fluid is heated. The fluid does not necessarily boil. The heated or vaporized fluid exits the boiler for use in various processes or heating applications, includin
Central heating
…circulating through pipes, or by steam fed through pipes. The most common method of heat generation involves the combustion of fossil fuel in a furnace or boiler. In much of the temperate climate zone, most detached housing has had central heating installed since before the Second World War. Where coal was readily…
A moveable (mobile) boiler (preserved, Historic Silver Mine in Tarnowskie Góry, Poland)
A stationary boiler (United States)
A superheated boiler on a steam locomotive
A boiler of Jämsänkoski's pulp mill with calorisator in 1938