Harvia M3M Series 16. 5kW Wood Burning Sauna Stove A best selling classic, the Harvia M3 Sauna Stove catches the eye and is ideal for smaller saunas from 212 to 459 cubic feet (CF). Required sauna stones 66 lbs (2 boxes) sold separately. With its classic design, even heat, and efficient air circulation, the Harvia M3 Sauna Stove can turn smaller saunas into a rustic getaway. The Harvia M3 provides the quintessential traditional sauna ambiance. The crackling