heat up the room and keep the heat in, as was the case within the Baths of Trajan and other later examples of Imperial bathing facilities, remains unknown due to the scant archaeological evidence of the site.

However, the baths, being a highly experimental project within the city of Rome, seem to have lacked a larger swimming pool, present in later Imperial bathing structures. It has been pointed out that this need could have been met with the man-made Stagnum (lake) of Agrippa or, more likely,