I have had 2 galvanized 3 gallon waterers for about 7-8 years now and I also use the metal heater bases on them. One waterer finally rotted out and the other is starting to seep. The metal ones haven't been available around here for a while so I bought a large plastic one. Works ok except it STINKS for some reason. The chickens don't seem to mind the smell so that's good. With winter quickly approaching and temps already 39* at night I need to think about plugging in the heater bases. Will they get hot enough to melt the plastic waterers? Anyone have experience with this?