Ours did not burn up, but it sure quite working.
Thankfully the store excanged it for us.
The manager mentioned that they have been seeing far to many being returned in various conditions of deadness....
The label on the one I got said that it only works down to 15 degrees. Fairly worthless at those temperatures this winter. I went with the heated dog watering dish, no problems, it's still out there working away.