I have not seen much discussion regarding using bird-bath de-icers to keep the chicken water unfrozen. I am planning to use the Farm Innovators C-50 150-watt model in a 3-gallon nipple waterer bucket. The instructions say it is safe for all bird-baths including plastic and that to save power it only turns on when the temp falls to 34-degrees. http://www.amazon.com/Farm-Innovators-Aluminum-C-50-150-Watt/dp/B0002DHBDY Do you expect it will work fine or are there some concerns? thanks!