Hello, I am trying to figure out watering in the winter here in New Hampshire. First winter with chickens that I re-homed. Received a water heater along with chickens, but afraid to keep water in coop because of excess moisture. The water heater is just a round raised pad to set water on. So my question is... can I use that outside and not keep water in the coop? I have been using cups from rentacoop, but feel those would freeze using the pad indoors (and they always leak/spill leaving moisture under them). Thanks, really stressing over winter coming and birds freezing.