We have pretty mild winters here, but I can't stand dealing with frozen poultry waterers. I use a 5 gallon hanging waterer in the warmer months, and those black rubber pans in the colder months. I put the pans in a nice sunny spot and they stay liquid during the day. They still freeze at night, so in the morning I just dump the ice (which helps keep the pans nice and clean since all of the debris comes out with the ice). We don't have, nor plan to put electricity in our coop. Good luck!