The Heated Rock Bird Bath De-Icer from Duncraft.
You can attract a greater variety of birds by providing open water when natural water sources freeze with the Heated Rock Bird Bath De-Icer, available at Duncraft. Thermostatically controlled to conserve energy, this 75-watt bird bath heater maintains open water for your birds when the temperature drops below 35 degrees. The durable aluminum housing won’t calcify, rust, or stain your birdbath, and you can even paint the rock heater to match your existing bird bath or to add some extra color.
For more information about the Heated Rock Bird Bath De-Icer and other quality birding equipment, see Duncraft.com: Heated Rock Bird Bath De-icer