We've been trying an experiment. Our water feeders and auto-water nipple systems have been freezing every day so we took one of our 5 gallon nipple water buckets and put a fish tank heater in it. We were thinking it would just be too cold and the small heater would burn up trying to keep the water from freezing, but it has lasted for this past week so far! Keeps the water nice and warm. Chickens and ducks really happy! Wonder how long the heater will last? Hopefully, it will last until it warms up!