Cozy Heat OG Sauna StoveWood Burning Sauna Stove, Up to 18kW The Cozy OG is an authentic wood burning sauna stove hand made in Estonia, where sauna is a national tradition. Wood fired sauna stoves create a mild and long lasting heat. Designed for pouring water over hot stones for an intense steam and a more satisfying sauna experience. 12kW for saunas from 210 to 423 cu. ft. 18kW for saunas from 317 to 635 cu. ft. Cozy Heat has taken the time honored craft of building sauna