Harvia Pro 20Pro Series 24kW Wood Burning Sauna Stove The Harvia Pro 20 Sauna Stove is designed for vigorous sauna bathing in medium sized saunas. Thanks to the large stone compartment of the stove, the steam is as pleasant and hearty as you can hope for. The fire glowing behind the cast iron framed glass door adds to the atmosphere in sauna rooms from 283 to 706 cubic feet (CF). Required sauna stones 88 lbs (2 boxes) sold separately. Features Wood burning 24kW