Thermae would be heated by a log fire before being channelled into the hot bathing rooms. The design of baths is discussed by Vitruvius in "De Architectura". "Thermae, balneae, balineae, balneum" and "balineum" may all be translated as "bath" or "baths", though Latin sources distinguish among these terms. "Balneum" or "balineum", derived from the Greek signifies, in its primary sense, a bath or bathing-vessel, such as most persons of any consequence among the Romans possessed in their own houses, and hence the chamber which contained the bath, which is also the proper translation of the word "balnearium". The diminutive "balneolum" is
Roman Thermae (Varna) Karel and Hermann Škorpil. Further parts of the ruins were uncovered between 1959 and 1971 by a team under M. Mirchev. In August 2013, Varna Municipality ordered an urgent reconservation project for the Roman Thermae worth 125,000 Bulgarian leva. The remains of the Roman Thermae lie in the southeastern part of modern Varna, at the intersection of San Stefano Street and Han Krum Street. They have an area of some , with the vaults reaching up to in height. By area, the Roman baths of Varna are the fourth-largest among the preserved thermae in Europe, behind the Baths of Caracalla