Harvia Legend 16kW Wood-Burning Sauna Stove With Ext. FeedIf you want to heat your sauna from another room or outside the building then this Harvia Legend 150 SL is for you. The innovative structure that separates the combustion air and directs part of the air to the upper part of the fire chamber will give you a cleaner and more efficient way of burning. The large amount of stones integrated with the modern black steel grate structure gives this wood burning heater a longer lifespan. The Harvia Legend 150