The real power of the Danfoss GX system is contained in the powerful GX 850 controller. The GX 850 is like having a mini weather station monitoring your installation 24 hours a day. Collecting temperature and relative humidity information from sensors embedded in the surface material, it is able to accurately sense when to turn the system on and off. The GX 850 perfectly balances the job of clearing snow and ice while minimizing energy consumption.