I am in search of a few heaters that I can use outdoors this winter to keep the water from freezing. It isn't for fish however. Earlier this summer I made some diy automatic water systems for my bunnies and chickens/ducks/goats. I have two 5g buckets and a 55g blue water drum. I'm thinking of using the walmart fully submersible heater for 5-10g tanks for the two 5g buckets as I already have one and they are cheap. Does it sound okay? I also need a fully submersible heater for 55g. Does this one look okay? I've been reading up on some and someone used one of these for the past few years. Also what size? 200watt, 300 or 400? I am thinking the 200 or 300 watt but they are out of the 300 and te 400 is cheaper... http://www.amazon.com/Hydor-THEO-Su...lies_4#mobile-twister_size_name_1436744543458 Anyone have any other suggestions for heaters? Again it's not for fish so it doesn't have to be a steady temp really, just to keep it from freezing. Also, I don't want a deicer or something like that, and whatever it is has to fit through a 2inch hole for the 55g water drum any ideas? Thank you!!!