a place beneath the flooring of an old Roman building in which heat from a furnace ended up being gathered to warm a room or a bath.
An underfloor room or flue through which heat from a furnace passes to heat up a floor of a space or a bath.
An underfloor heat, also without these types of an underfloor area or flue, as adjusted towards modern housing, east and west.
A furnace, esp. one associated with a series of small chambers and flues of tiles or other masonry through which the warmth of a fire ended up being distributed to areas above. This contrivance, very first used in bathtub, had been a short while later adopted in personal homes.
In structure, an arched fire-chamber, from which heat is distributed through earthenware pipes into the spaces above it. The term is also sometimes placed on a fireplace, furnace, or range.