In freezing temps I believe the best route to go would be base heaters under your waterers. When I was a kid on the farm in MN we had to tote hot water to the coop every morning and evening, it was a pain. These days if you have a farm and raise chickens you got choices we didn't have in the...
I have both the top fill and the double sided like you have pictured...the double sided one shouldn't ever overflow, at least in all the years on the farm and where I am now, never had one do it. The top fill one I have does need maintenance however. The O ring is usually the culprit so I keep a...