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Condensing boiler
Condensing boiler
Condensing boiler exhaust vapour
Condensing boiler exhaust vapour
Condensing boiler
Condensing boiler
Stainless steel exhaust with condensate
Stainless steel exhaust with condensate
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A condensing boiler
A condensing boiler
Hot water central heating unit, using wood as fuel
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).
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
Sylvester's warm-air stove, 1819