In areas with high relative humidity, temperature drops cause formation of dew inside the enclosure of the GPU. On a long-term basis, this can affect components such as relays, switchgears and printed circuit boards (PCBs). Dew formation can; however, be avoided by installation of heating elements in the GPU.

During operation, the waste heat from the circuits prevents dew from arising. In stand-by mode where the internal losses are insignificant, two 60 W anti-condensation heaters automatically switch on and prevent condensation from arising.