This waterer provides plenty of H2O at this central Minnesota dairy, despite the frigid temperatures outside.

Prior to investing in the waterers, the farm had tried using stock-tank heaters, but there was always the problem with cattle chewing on the heater cords. Now, with the heated waterers (with self-contained heating units), the farm saves on electricity — $300 to $400 per month — compared to the stock-tank heaters. The water does not freeze, even in temperatures as low as 30 degrees below zero, says farm owner Karen Treangen, of Hibben, Minn.