We bought 2 types of waterer for winter. One is a double-sided 3 gal galvanized waterer with a heated base and the second is a heated dog bowl. I was going to use the heated dog bowl for the barn cats, but my hens like to splash in water so much with their beaks that I'm giving them the dog bowl to see if it works out. We installed it today, leaving the old summer waterer alongside in case we get a hen who resists the change. When we're sure all of them are using the new one, we'll use it exclusively in winter. We were lucky because there is a vertical beam in the coop which we could drill to push the cord through into the barn aisleway where there is an outlet. You need a drill bit sized 1 3/8 " to get the three-pronged plug through. It barely reached! The 1.5 gal waterer is from Farm Innovators and has a cord protected with spring-like wire to discourage chewing or pecking. So far I like it a lot. So do the hens! The bowl label lasted about 20 seconds, so I got it out of there!