I know freezing water has been discussed over and over. Most of the threads I search are people who do not have electricity to the coop. The past couple winters I have used a heated dog bowl but the largest one I could find was 1 gallon and had to be filled every day with 9 hens. I now have 16 hens so I am wanted something larger so I don't have to haul water out every day. I am curious which of the heated waterers you folks have had good luck with. I would like something in the 2-5 gallon range.....