Well, I thought I'd throw in a description of my solution, and a report on its functionality.
I went for an
EasyHeat Pipe Heating Cable w/Thermostat, to apply to a 1/2" CPVC pipe attached to a hosebib on my house within my run. On the end of that was a
Miller Manufacturing King Size Automatic Fount. I ran the heating cable the entire length of the pipe, and then draped it under the fount. Everything seemed fine, but over-night the system failed. The thermostat has to be placed on the pipe, so there's a section of pipe that isn't heated. In my case, that was the section within 4" of the hose bib, so the hose bib froze. Also, the valve on the fount end froze as it also didn't have cable on it. Now to their credit, EasyHeat expect you to have insulation on the line around the heating cable, which I did not have. However, after talking to a Tech Support rep at EasyHeat, we agreed that even with full insulation chances are the two ends would still freeze.
So, what I have now is their
PSR heating cable, which is the type of heating cable you'd run along an eavestrough or a downspout. One big difference between the two types of cables is that the PSR cable can be wrapped over itself, so you can use it to twist around things like the hose bib. One downside is there's no thermostat with the PSR, so it runs constantly, albeit at 5watts per foot (so not really that much cost). I haven't installed this PSR cable yet, so can't say whether this will solve the problems, but, certainly the thermostatic EasyHeat pipe heating cable doesn't work.
FWIW, if I ran a line from inside the house to the run, split of the line to the bib inside the wall, I could run the thermostatically controlled cable into the wall of the house, thereby preventing freezing at the hose bib (by eliminating the outdoor bib). Still doesn't solve the problem at the fount end though.
In case you're wondering, the entire rig is attached to the south wall of my house, within the chicken run, protected from wind. The bib and fount froze at temperatures between 25F and 32F for one day.
I will again ask, if anyone else has this part figured out, namely how to keep a hose bib from freezing outside, chime in.
Cheers,
Russ