Harvia Linear 16 Wood Burning Sauna StoveThe Harvia Linear 16 is a source of glowing heat for smaller saunas up to 459 cubic feet (CF). 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. This heater requires a maximum of 80 LBS of sauna rocks (2 boxes).