Heated metal base pan. Made to be set on the ground. Simply place your (or our) double wall galvanized waterer on the base to keep your water from freezing in winter months. Thermostatically controlled to operate only when necessary Designed for use with double wall metal founts only Prevents water from freezing down to 10°F For outdoor use in a dry, covered area 125 Watts 16.5″ wide x 4″ Tall Sold seperately this base is made to fit under our 2, 3, & 5 gallon Double Wall Galvanized Metal Waterers available.