When we priced a new aquarium heater the local Wal-Mart wanted $19 + tax (approximate) for the smallest one in stock. We still needed a small bucket. Went to Rural King to browse around and to our surprise we came upon this http://www.ruralking.com/farm-innovators-heated-2-gallon-bucket-hb60.html Perfect size for what we need and has a built in heater!! Did a few modifications to it (chicken proofed it) This is what we came up with . Its just a cut piece of plywood we had leftover from building the chicken coop with the horizontal water nipples. We are hoping it doesn't freeze this winter I will try to keep this updated to let you all know if it freezes or not this winter.