We picked up this (http://www.fleetfarm.com/detail/allied-precision-bucket-utility-de-icer/0000000084936) this afternoon, and I'm hoping it'll work. I was wondering if any of you have used this particular de-icer or one similar? It will be de-icing about 3-5 gallons of water in a 15-gal plastic stock tank. It seems like it could work perfectly for this set-up, but I do have a few things I'm worried might be a problem. My three main concerns are 1) Burning? I wouldn't think this would get very hot - it's only supposed to keep the water from freezing, not get it hot - and since they said it works in a birdbath (which little birds get into), I'm hoping it'll be okay. It is also safe for use in plastic, so it must not get overly hot. Do you think I need to be careful about this? 2) the Teflon coating. Again, probably this is fine, but I remember a long time ago reading about how Teflon (perhaps in the air) is bad for small pet birds (the ones you keep in your house ). Do you think it's okay for it to be in the ducks' drinking water? 3) Too much heater for too little water? This de-icer is for up to 15 gallons - is 3 gallons too little water? Some birdbaths are quite shallow, so probably okay? Thanks!