For my C9.25 I use an Astrozap Dewshield with in-built heat strip and feed this from a Kenrick 12v hand controller. Both I ordered online from the US and Canada respectivey and received swiftly with no bother.
The astrozap dewshield does the trick soe nights by itself and if I do use the heater either leave it on low or turn up full blast to de-dew and then turn off again.
cheers,
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