I figured this out by accident and it seems to be working so far... I bought this heated bowl for my 2 ducks and 5 chickens. I elevated it thinking it would keep the ducks from playing in it. No such luck. The water was actually always pretty warm, and the ducks loved it so every morning there would just be a little muddy mess in the bottom of it. http://www.amazon.com/gp/product/B000Y8GQ56?psc=1&redirect=true&ref_=od_aui_detailpages00 So I took my black rubber (Fortex?) bucket and set it right inside it - fits perfectly. The heated bowl has been keeping the bucket from freezing. The ducks still play in it (obviously) but at least my birds do not run out of water, and my chickens will still drink out of it. The coldest it has been so far is 25 F, so we will see if this hack works as it gets colder- but I was almost going to give up on this bowl when I figured this out.