Harvia Legend 240 SLLegend Series 21kW Wood Burning Sauna Stove w Ext. Feed The Harvia Legend 240 SL wood fired sauna stove will give you the optimum sauna adventure due to the large amount of stones ensuring good heat. Heat your sauna from outside the building or another room. The fire chamber has an innovative grate structure that separates the combustion air. It can be fitted with a pipe mounted water heater and it heats rooms from 353 to 848 cubic feet (CF). Required