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