Harvia Linear 16 BlackLinear Series, 17. 9 kW, Wood Sauna Stove The Linear 16 wood burning heater is source of glowing heat for smaller saunas up to 565 cu. ft. Through the warm glow of the cast iron glass door, with optional door direction, the fire enhances the sauna atmosphere. The fire chamber and combustion air channels of Harvia wood burning heaters are designed so that sauna warms quickly and the burning is cleaner. Required sauna stones 80 lbs (2 boxes) sold