This is a great product to use in combination with the Rubber Water Pan. It is used to keep waterers from freezing in cold months. Element carries 1 year guarantee; 100 watt, 115 volt. It is 16″ in diameter and 3 1/4″ in height. Model AEB will keep the water from freezing with temperatures in the single digits in a sheltered area. The AEB is not designed for outdoor use where there is apt to be single digit temperatures (or colder) with a wind chill.