different between hypocaust vs tepidarium

English

From Latin hypocaustum, from Ancient Greek ??? (hupó, “underneath”) + ?????? (kaíein, “to light a fire, burn”)

hypocaust (plural hypocausts)

An underfloor space or flue through which heat from a furnace passes to heat the floor of a room or a bath.
An underfloor heating system, even without such an underfloor space or flue, as adapted for modern housing.

Latin tepidarium

tepidarium (plural tepidariums or tepidaria)

(historical) A warm room in a Roman baths that was usually heated by a hypocaust.
(historical) A boiler in which the water was heated.
Any room containing a warm bath.

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