15 inch Metal Water Drinker Heated Base: Constructed entirely of galvanized steel, this sturdy and durable heating base has high heat transfer efficiency and is rust-resistant. Suitable for use with metal poultry founts up to 5 gallons. Automatic Thermostat Control ensures energy-efficient temperature range and prevents excessive heat. Durable Chicken Water Heater Base prevents water from freezing in temperatures as low as 10°F, making it ideal for chicken coops, cages, pens, and covered outdoor areas. Safety and Efficiency features a flame-retardant plastic-coated power cord and automatic voltage cut-off for unstable power. What You Get - 12 months worry-free service and 24-hour quality service support.