I bought a heated bucket, but we don't know if the outlets in the barn have a ground interupter. If something happens with the bucket it will prevent the water from getting electrified. That's the biggest concern I have.
I like the floaters but I would never leave on in the tank unattended, a horse could very easily pull it out or eat at the wires.
I never leave it in the tank while the horses are in the pasture. They come in at night, so I put it in then and take it out when they go out. I was terrified that they would electricute themselves. My horses are extremely accident prone. Lol
I also have heated buckets for the stalls. I love them.