The terracotta stove - a brief history

"The history of the terracotta stove leads us to the Alps, where the first terracotta stoves were made between the 11th and 13th century. Round, mug-like vessels were incorporated in its walls to enhance heat-transfer. There is ambiguous, sparse data of their presence before the 11th century, but the terracotta stove is a European invention, its history cannot be traced until the great antique civilizations. The spreading of stoves took place between the 13th and 14th century, when their first representations appeared. In the Middle Age significant centers were developed on the southern territory of Germany, in the Czech kingdom and in Hungary."

(SABJÁN Tibor Nagy kályhakönyv, Sprinter kiadó h.n., é.n., 11.)