Harvia M3 SL 16.5 kW Black Stainless Steel Wood-Burning Sauna Stove With Exterior FeedThe Harvia M3 SL model is designed for people who want to conveniently heat their sauna from another room or outside the building. The opening direction of the door can be changed, making these wood burning heaters even easier to use. SL and Boiler wood burning heaters provide great bathing in small and medium sized saunas. All Harvia wood burning heaters for through the wall heating models are equipped with a glass door. Harvia M3 SL sauna wood