Water is a vital resource to birds in the winter. Offer fresh water to birds through the winter months with a heated pan. Long-lasting Western Red Cedar frame, 20 IN diameter. Two triangular mounts are adjustable for deck railing, up to 14 IN. Guaranteed to provide your birds with water down to -10 degrees F or -23 C. The insulated 60-watt heating element is thermostatically-controlled, enclosed and sealed inside the pan, and activated when water temperature goes below 35 degrees. Removeable, heavy-duty, clay-color, bird bath pan is 14 IN diameter, 1 IN deep with 12 IN cord. It holds .5 gallons of water that stays thawed, but does not get warm.