Cozy Heat Quattro Thru-Wall Sauna StoveThe stylish and elegant Quattro 12 TW from Cozy eat will complement the rustic appearance of your home sauna, and its through the wall design allows you to load firewood from outside your sauna. COZY has taken the ancient wisdom of building a sauna to a higher level. This unique wood burning stove is hand made in Estonia, where sauna bathing is part of daily life. Wood fired sauna stoves produce a mild, long lasting heat and are designed for ladling