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
Mechanical room
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A mechanical room, boiler room or plant room is a technical room or space in a building dedicated to the mechanical equipment and its associated electrical equipment, as opposed to rooms intended for
Mechanical room in a large office building.
Elanto's old boiler room in Helsinki, Finland in September 1930
Mechanical room in federal building, Los Angeles, California