I have used both the heated platform for the galvanized water fonts and the plastic water font with the heated base. I don't have electricity in my coop, but just use an extension cord in the winter. I prefer the plastic one although it is a royal pain to fill, especially when the wind is blowing and my hands are freezing!
I should add that I like to elevate my water font using a big brick. Combined with the heated platform, the bantams I have now couldn't reach the water font hence my reason for trying the plastic one with the heated base.
Edited by sovia - 5/16/12 at 7:42am