There's no better way than fresh, open water to attract wild birds in the winter! The Automatic Water De-Icer is our choice for keeping bird bath water thawed and drinkable. Its multiple thermostats and low-profile design with finned surface area produces the same heat output as traditional de-icers without overheating - it's only on when needed. Durable, non-stick aluminum base is easy to clean and prevents mineral buildup. Keeps up to 30 gallons de-iced. Safe for use in plastic containers. 6-foot cord. LOCKNDRY compatible. 250 Watts, 120 Volts. cULus Listed.