The stylish and elegant Quattro 12 TW from Cozy eat will complement the rustic appearance of your home sauna, and its through-the-wall design allows you to load firewood from outside your sauna. COZY has taken the ancient wisdom of building a sauna to a higher level. This unique wood-burning stove is hand-made in Estonia, where sauna bathing is part of daily life. Wood-fired sauna stoves produce a mild, long-lasting heat and are designed for ladling water over the hot stones to create a luxurious steam sauna. The most sensitive part of the wood-burning heater, the flame cutter, is made of 5mm-thick stainless steel, making COZY heaters extremely durable. The Quattro 12 TW's clean lines and minimalist design create an understated elegance, and the large viewing window allows you to view the mesmerizing glow of the dancing flames. 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).