We have a vacation place in the Poconos which had an awful ice dam this winter on a certain part of the roof doesn't get any sunshine. I picked up (only) 50 ft of fancy self-regulating heater cable at a good price. 2 questions:
1- the GFI outlet is about 12 feet from the roof, and I don't want to waste that length of the heater cable. Can't find a decent short length of outdoor 12 gauge extension cord. If i cut and shorten a 25' extension cord, how to best waterproof it so I don't short the GFI? splice, wrap with tape and cover with silicon caulk? Should I do the same to where the extension cord joins with the heater cable cord?
2- How expensive are these to run? like a toaster all winter?? Even though they can be set to come on only below freezing... that still means all winter long. The heater cable runs off a dedicated GFI circuit breaker, but we're not at the house all the time to monitor when an ice dam is forming. Any ideas?