Join Date: May 2007
Location: Fairbanks, Alaska
I have never heard of those being used. I suppose that if you had milder cold climates, they might work - same concept of a flowing stream that doesn't freeze over. I would say that it your temperatures get cold enough to freeze up moving bodies of water, I wouldn't try it. I don't think they would work here for sure - getting down to 30 below. I know your pain about paying for the electric on those tank heaters.
Suggestions: use and old chest freezer as a water tank and cover 3/4 of it with a piece of foam for insulation - that will help your heater not have to turn on as much because the water will hold temp. better. You can also build an insulated box and lid for your regular stock tank. Also, try to situate tanks so that multiple horses share - running less heaters, but having to fill more often in the cold (trade off). We build our barns so that the tanks could slip under the stall and half could be accessed by one horse in a stall, and the other half could be accessed by the horse in the other stall (this works good for horses who have to be penned alone. Our other horses share a large tank in the field.