Cozy Heat has taken the time-honored craft of building sauna stoves to a higher level. The part of the wood-burning heater that must be the strongest, the flame cutter, is made of sturdy, 5mm-thick stainless steel making COZY heaters extremely durable. Hand made in Estonia - where sauna bathing is a national tradition - the Cozy OG wood-burning sauna stoves are ideal for mild and long-lasting heat, and are designed for pouring water over hot stones to create luxurious, intense steam. The body of the wood-burning sauna stove features an innovative and contemporary trilateral design, characterized by clean lines and graceful curves. Experience the pinnacle of comfort and sophistication with the Cozy Heat OG! Installation and operation manual Stove utilizes 25%-40% less fuel than comparable sauna stoves Boasts minimal safety distances Sauna room sizes:12kW- 210 to 423 cu.ft.18kW- 317 to 635 cu.ft. Stone Requirements:12kW- minimum of 265lbs of stones18kW- minimum of 353lbs of stones 12kW- minimum of 265lbs of stones 18kW- minimum of 353lbs of stones Please note that each natural stone is unique in shape and size. We recommend purchasing an additional box of sauna stones to allow you to choose the highest quality of stone for fit, form, and function (Additional freight charges will apply).