bathhouse

A bathhouse in Roman times consisted of several component parts:

1. Water tanks. Boiling water was in the lower tank while cold water could be added to the upper tank;
2. A fire from which hot air would pass through conduits in the floor and warm the room;
3. The bathing area.

This image was taken from the English edition of the Koren Talmud Bavli, Tractate Berakhot, daf 60, page 388.