I hope everyone had a nice Thanksgiving. I don't have time to catch up, I'm still struggling to get this new coop put together. Almost there. It's an 8 foot by 6.5 foot walk in with a 9.5 by 6.5 chicken run. Right now I need some clarification / advice on heated waterer pads. I've ordered 2 and I keep getting these huge 15 inch diameter heaters Is this normal? My waterers are half that size. The large 2 gallon top fill galvanized waterer I've been using might work on it but it's starting to rust. I ordered a 2 gallon plastic bottom fill waterer but my experience with that type is they leak. Help!