Caldarium
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A caldarium was a room with a hot plunge bath, used in a Roman bath complex. The boiler supplying hot water to a baths complex was also called caldarium.
Caldarium from the Roman baths at Bath, England. The floor has been removed to reveal the empty space where the hot air flowed through to heat the floor.
Hypocaust
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A hypocaust is a system of central heating in a building that produces and circulates hot air below the floor of a room, and may also warm the walls with a series of pipes through which the hot air pa
Caldarium
…in a Roman bath complex. The boiler supplying hot water to a baths complex was also called caldarium. This was a very hot and steamy room heated by a hypocaust, an underfloor heating system using tunnels with hot air, heated by a furnace tended by slaves. It was also the hottest room in the regular sequence…
Hypocaust under the floor in a Roman villa in Vieux-la-Romaine, near Caen, France
Ruins of the hypocaust under the floor of a Roman villa at La Olmeda, Province of Palencia (Castile and León, Spain)
Hypocaust at Chesters Roman Fort