HUUM HIVE 12STUX PkgHIVE Series 12. 0kW Sauna Heater Package The HUUM HIVE 12STUX sauna heater package comes complete with the traditionally designed HIVE 12kW sauna heater, UKU control (Wi Fi optional), UKU extension box, and sauna stones. This package provides unmatched efficiency and performance, and has been engineered for larger sauna rooms up to 883 cubic feet (CF). The HUUM HIVE 12STUX sauna heater package features all the necessities that will give your sauna