Amazon.com : Keten Chicken Coop Heater, 100/200 Watts Radiant Heat Energy Efficient Design, 3 Ways to Use, Safer Than Brooder Lamps Heater with Digital Display and 5 Timing Setting(16.7'' X 12.2'') :
200-Watt Flat Panel Design Cozy Coop Safe Chicken Coop Heater CL-COOP - The Home Depot