XTREME forced air heaters are small, highly efficient compartment heaters that will protect your boat or RV from the threat of sudden freezes. Helps extend battery life, keeps your engine compartment and it's critical components warm and dry, and provides safe, reliable protection for an RV's components. Self regulating and energy efficient. Heater uses an automatic thermostat. Pre-wired with a 15' marine rated power cord. Tested for the ignition protection requirements of the ABYC E11, the USCG, ISO 8846, SAE J1171 & UL 1278.True Forced Air Heating circulates air more effectively and heats more evenly for more accurate climate control.Automatic Thermostat turns the heater on at 40°F and off at 55°F +/-3° - the tightest tolerance available.Failsafe Design cannot overheat. Heating technology is dynamic and self-regulating.High-Efficiency Xtreme produces heat faster, circulates more air and shuts off earlier.Pre-wired 15ft marine rated power cord with 110V 3 prong plug eases installation.Maximum Life - Designed for durability and reliability.Complete Protection: Fully anodized inside and out.