(Little Giant) Electric Water Heater Base is used to prevent metal poultry waterers from freezing in temperatures as low as 10 degrees F. Perfect for outdoor use, in a dry sheltered area. Cord should be protected from animals and used with a ground fault protected outlet. Unit will not draw electricity until temps drop below freezing. Not recommended for use with plastic waterers. 16 1/2" diameter x 3 1/2" high.