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I'm assuming then that you haven't actually tested it. A heated base only heats the water inside the body of the waterer. Any water in the cups should freeze. I don't see any explanation on how the interior mechanism of these cups differ from other cup waterers, which DO freeze in winter and...

I don't see how these could possibly work in freezing temperatures, looks like they're specifically designed for hotter temperatures. Have you actually tried these in freezing temps and if so how cold did it get?