Harvia Virta CombiHL80SA, a versatile combination of an 8kW electric sauna heater and a steamer, for the ultimate steam sauna experience. It is engineered to power sauna rooms up to 431 cubic feet (CF). Required control and sauna stones 100 lbs (3 boxes) sold separately. Sidewall or corner, floor mount install For sauna rooms from 177 to 431 cu. ft. Requires a minimum of 100lbs of stones (3 boxes-AC3020) Please note that each natural stone is unique in shape and size. We recommend purchasing an additional box of sauna stones to allow you to choose the highest quality of stone for fit, form, and function.