I bought one new this year and it was pretty pricy at TSC. My ducklings had quit using it and it had water in the bottom that I did not notice. By the time I saw it, it had rust in it and was ruined. I have a plastic one now I will use. Be sure to keep it clean or yours may rust too. I was surprised that it did with what it cost. I should have checked it though so it was my fault.Look it over well and if you don’t see evidence of chewed wiring it will probably be fine.
Watching it is also good.
If you want to be overly abundantly cautious, either make sure it’s plugged into a GFCI circuit, or you could get a short GFCI extension to plug it into.
I use one myself.
One other pro tip, those galvanized metal waterers. Don’t put the top on the bottom and carry the whole thing by the top handle. It’ll eventually break the spot welds that hold the handle on and cause an air leak. Air leak = loss of vacuum = all your water slowly coming out over the course of 8-10 hours. Instead, carry by the heavier duty handle in the bottom and put the top on when you get to the coop/run.