My radar heater also works perfectly.Up here the uncovered one works remarkably better than the covered ones. Thanks to the heater snow and icy conditions are not a problem as for the vehicles having sensor hidden behind cover/emblem.
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I got a chance to verify this over a very long drive this winter.
It didn't get affected/blinded by the snow nor the ice even once.
Only 7E0 radar (T6 variant) of a 7N0 radar family is equipped with a heater.
Caddy, Sharan, etc. don't get this amazing functionality. Credit goes to @dnoermann