Extend your boat usage during late fall and early spring with these small and highly efficient marine bilge heaters. Designed to fit in the smallest package possible, the Xtreme Heater helps extend battery life and keeps your boat's critical components warm and dry. Self-regulating forced air provides more accurate climate control for cost saving efficient use of energy. Automatic thermostat turns heater on at 40°F and off at 52°F. Resettable thermal overload protection prevents overheating. Fully anodized inside and out for superior protection from the elements. Prewired for ease of installation. Full one-year warranty.