Stunning with its black stainless steel exterior, Harvia's The Wall 8kW home sauna heater features a built-in, top-mounted control that can be configured on the right or the left side of the unit and is illuminated for easy operation in low light. Harvia's The Wall SW80 sauna heater is engineered to power home sauna rooms up to 423 cubic feet (CF). Direct rock-to-heating element contact For sauna rooms up to 423 cu. ft.