Be careful with the aquarium heater, they are not designed to run dry and the glass ones can fracture if run dry and if in a plastic container they should not contact the bucket as they could melt it... If you look at the one I used, you can see the glass part can't really contact the plastic surface due to the rubber bumper... And last but not least they generally run 70° or more and that can be overkill in many cases, but it's not some huge electricity concern with a 50w heater and small volume of water...
Also avoid the cheap made in China stainless steel aquarium heaters on Ebay, I have tested a few of them and they have all failed in short or worse the seals leaked and electrified the water...
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