I've got a
I have heaters. Not a problem, electric in one coop and an extention cord to the other also not a problem. Draining that hose is a big problem and spending too much time out there is too. Would love to have water supply that will last a few days without needing refilled .
You would need a large enough waterer that you could have the lid off without it emptying the waterer on the ground. Then a bird bath heater or something similar to keep the container from freezing.