For anyone who’s been following:
I can happily say that it all works perfectly. I ran it for 6 hrs last night. The overall increase over a temperature drop of 5 Deg last night was a bit over 1 watt. And no dew formed on either the guide scope lens or the secondary mirror. It wasn’t a bad night for dew but there was moisture on the OTA which in the past would have seen at least the guidescope start fogging up. More testing to come, maybe on a more dewy night but things look promising so far
Cheers
Ryan