This Electric Heater Base helps prevent water from freezing in temperatures as low as 10 degrees F. Designed for use with Little Giant double wall founts and other metal containers. The heating element has been completely redesigned for improved safety and efficiency. The fully enclosed bottom adds another layer of protection. Perfect for unheated coops and barns; can be used outdoors in a dry sheltered area. Made of heavy-duty rust-resistant galvanized steel. Cord should be protected from animals and used with a Ground Fault Circuit Interrupter (GFCI) protected outlet. Unit will not draw electricity until temperature drops below freezing