Easy Affordable Heated Waterer

My favorite way to use the 1 gallon waterers we all have a zillion of, despite freezing temps is to use a heated dog bowl like this
Farm-Innovators-1.5-Gallon-Round-Heated-Pet-Bowl-in-Green.jpg

Then I fill it to about an inch from the top with sand and plug it in. This is where you work the waterer down into it a bit and the heated sand keeps your waterer thawed!