Authepsae were usually used to heat up water meant for diluting wine. This highly decorated example, however, seems to have been used for heating the wine directly.
Dayagi-Mendels, Michal, "Drink and Be Merry", Wine and Beer in Ancient Times, The Israel Museum, Jerusalem, 1999
Drink and Be Merry. Wine and Beer in Ancient Times, Israel Museum, Jerusalem, 03/06/1999 - 01/01/2000