Birdbath, Heated Insert, 14" Erva

14" Heated Bird Bath Dish Insert. Fits any 14" Bird Bath Ring. This unit is designed for use with Erva clamp, pole, screw or ground level bath support rings. The unit is not recommended for placement in large bird bath bowls which may fill with water, or on the ground. The thermostat is set to turn the unit on at 38 degrees Fahrenheit and off once it reaches 65 degrees Fahrenheit.