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I haven't read all pages so forgive me if this has ready been said..
You would be better off getting a lamp kit, cookie tin (they come in all sizes) and a light bulb to make a heater.
Drill a hole in the side of the cookie tin, insert wire attach socket, Cap (forget the name of these) and tape ends with electrical tape, screw in a 40 w light bulb ( for cold areas) put lid back on tin and you are set for keeping water thawed. Seal hole in tin so no water manages to get in there. Set waterer, plastic or metal on top of cookie tin.
I use both plastic and metal waterers on these and it works great for both.
I use the ceramic lamp sockets and mostly 20W for the little ones to 40W for the bigger ones.
I made 8 of them last year for well under under $40.
Good to have spares.
Also make great gifts for someone that has chickens.
You can find these tins at many used shops.
I make them in all sizes, for all sized waterers.
Need less heat? change bulb out to a 20W.