I didn't want to derail the feeder thread, but last year I used a 2 gallon bucket with horizontal nipples, with a birdbath de-icer and a submersible pump in it. Similar to this:
http://www.backyardchickens.com/t/833465/diy-instructions-for-very-easy-heated-waterer-for-under-20-bucks
I used a 2 gallon pail as I could easily carry and bring it in if I needed to for cleaning. or over night "just in case"
http://www.backyardchickens.com/t/833465/diy-instructions-for-very-easy-heated-waterer-for-under-20-bucks
I used a 2 gallon pail as I could easily carry and bring it in if I needed to for cleaning. or over night "just in case"