I am not a horse person, but I am in charge of building a barn for my daughter.
After visiting several horse facilities, I have decided against "automatic water" things. One upscale place didn't like them because of lack of being able to monitor amount of water taken by the horse, the other professional stable that was irritated by expense, reliability and repair expense issues (they had them, and regretted having them), and a similar facility to what I plan, just provided heated water in the 5 gal bucket from a garden hose!
Furthermore, the plugged in buckets give me the willies. I don't like water and electric so close together!
I am in south central Pa. ,between Harrisburg & State College, and freezing can be expected at night November through March.
So...... I am looking at the "insulated" 5 gal bucket holders. Any experience with certain brands, good or bad.