Hi, I am considering buying a submersible / submergible deicer for my 5 gallon metal chicken waterer to keep it from freezing. Has anybody used one like this? For some reason I would think it may work better/more economical, better contact etc. than the usual fount heater that you put under the waterer. I would just have to put a hole in the top with a rubber ring around it, to create the vaccum seal - not sure if that will make it too complicated... Cast Aluminum Deicer Multiple thermostat control de-icer 250 w cast aluminum for use in buckets or as a utility use deicer. Comes with 10ft cord with chew protector and a 3 year warranty. Ingredients:One De-Icer Consiting Of Cast Alluminum, Plastic An Electronic Components. They cost $37 incl. shipping.