The Wall 8kW home sauna heater from Harvia features a polished stainless-steel exterior and an illuminated, built-in, top-mounted control that can be configured on the right or the left side of the unit. Harvia's The Wall SW80 sauna heater is engineered to power home sauna rooms up to 423 cubic feet (CF). Requires a minimum of 44lbs of stones, sold separately. Direct rock-to-heating element contact For sauna rooms up to 423 cu. ft.