AND MUST NEVER RUN LOW ON WATER, you must prevent a chicken from stepping into the pan, lest a chicken burn its feet. I would not use a pan, only a galvanized waterer, which is what I use. GC
It will need a flat bottom, with straight sides, be a heavy metal and and a good conductor of heat. I don't know of any, myself. A bowl shape will tip over when a chicken steps on the rim. GC