This HUUM DROP sauna heater package comes complete with the compact, award-winning DROP 4.5kW sauna heater, UKU control (Wi-Fi optional), and sauna stones - everything you need to transform your sauna space into your dream sauna sanctity. The package has been combined for use in sauna rooms up to 247 cubic feet (CF). For sauna rooms from 106 to 247 cu. ft.