That's actually a pretty clever idea. Moving water sure doesn't freeze. We use moving water to keep water open for our water fowl with a pump. I suppose the gravy stirrer could work the same way as long as it moves the surface of the water enough.not sure if anyone has seen the tv commercial for a battery powered sauce/gravy stirrer...you put it in the bottom of the pan and it constantly moves things around...i think these would be great for keeping the water from freezing...we haven't gotten one yet but when i see them in the store i am going to get a couple...right now we are breaking the ice on the water bowls 2 times a day...my what we go thru for these chickens lol!