Also, with the pipe heating wrap(you can get a small 6ft section from the hardware store, and just wrap it multiple times around the bowl) it has an internal thermostat, so it only turns on when it's freezing, making it energy efficient as well.
We just taped(metal tape for duct work) pipe heating wrap from the hardware store around the bowl and plugged it in. Works great! And was very inexpensive to do.