Vega Series 3.5kW Sauna Heater Package, Built-In Controls The Harvia Vega 3.5kW Sauna Heater Package with Built-In Controls comes complete with the Vega Compact BC35 Sauna Heater and Sauna Stones. This powerhouse heater package is easy to install onto the wall and can be mounted very low in sauna rooms from 70 to 175 cubic feet (CF).