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. It is a component of heating, ventilation, and air conditioning systems, which can both cool and warm interior spaces.
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, including water heating, central heating, boiler-based power generation, cooking, and sanitation.
A moveable (mobile) boiler (preserved, Historic Silver Mine in Tarnowskie Góry Poland).
A stationary boiler (United States).
1950s design steam locomotive boiler, from a Victorian Railways J class
A superheated boiler on a steam locomotive