Cozy Heat has taken the time-honored craft of building sauna stoves to a higher level. This wood-fired sauna stove is hand-made in Estonia, where sauna bathing is a national tradition. The OG-TW's clever "Through-the-Wall" design lets you load firewood from outside your sauna. Wood-burning sauna stoves produce a mild and long-lasting heat and are designed for pouring water over hot stones to create your perfect amount of steam. 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. Cozy Heat's OG-TW model has an elegant and sophisticated trilateral design that is elegant and sophisticated, elevating the aesthetic appeal of your sauna. With its sleek lines and contemporary finish, this stove complements any sauna decor, creating a luxurious ambiance that beckons you. Experience the pinnacle of comfort and sophistication with the Cozy Heat OG-TW! 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).