COZY has taken the craft of building a wood-fired sauna stove to the next level. This Cozy Heat though-the-wall wood-burning sauna stove is hand-made in Estonia - where sauna is a way of life - and is perfect for intimate sauna spaces. Wood-burning saunas are best for mild and long-lasting heat, designed for pouring water over hot stones to create the perfect amount of steam. Its through-the-wall design allows you to feed firewood into the stove from outside your sauna room. The most sensitive part of the wood-burning heater, the flame cutter, is made of 5mm-thick stainless steel making COZY heaters extremely durable. Enjoy a relaxing traditional sauna experience with the Cozy Heat TW wood-burning sauna stove! 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).