Cozy 12 OG Wood Burning Sauna Heater – 12kW Elegant Cylindrical StoveMild, Long Lasting Heat with the Elegant Cylindrical OG The Cozy 12 OG is an elegant cylindrical, wood burning sauna heater engineered for soft, enduring warmth and rich steam. Built in Estonia by specialists with generations of know how, its optimized for pouring water over stones to deliver traditional lyly. With a tested thermal output of 11. 5 kW, the Cozy12 OG suits sauna rooms of 613 m and is available in INTERNAL or EXTERNAL (through wall)