Rather than actual heat tape that is more sensitive to sharp objects such as a trowl to clean the gutters, I could run pex pipe throughout all the gutters and downspouts. It is more robust and on it's own does not really have points of failure such as wires shorting out, elements burning out etc. The two ends would go into the house. From there, I would either pump hot air through it, or liquid, but hot air would be ideal as I don't have to worry about finding a liquid that wont freeze. I could either generate my own heat for it, or use the heat from the house, possibly the server room.
Basically it would just be a heat exchanger. Would probably cost less to run too. Now this would not be as effective as real heat tape, but if left on 24/7 would it at least eventually work ok? I'd imagine the liquid or air going through would need to go through very fast as to dissipate it's heat slowly and more equally throughout the entire system. I'd be looking at maybe 200 feet worth of run. If I go with air, just not sure what I'd actually use, guess some kind of high static pressure blower or something.
Source: http://www.diychatroom.com/f9/diy-heat-tape-alternative-109511/
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