The K&H 9000 the first birdbath heater that looks like it belongs in a birdbath. It safely maintains open water to 20° below zero Fahrenheit. It has a natural color and an 18" cord that blends in with nearly every birdbath. The K&H 9000 heater is virtually indestructible. Durable enamel finish is easy to clean. The heater is thermostatically controlled, using only 50 watts, and is completely safe to handle and use, even in plastic birdbaths. One-year limited warranty