Start the boating season earlier and end later by protecting against sudden cold snaps. Comes on when it's needed and turns off when it's not. Dual airflow redundancy: Two fans are used for added security in case of a single fan failure.Omnidirectional airflow discharge: Better thermal mixing of air results in more uniform heating throughout the compartment. Ensures the coldest locations in compartment components do not drop below zero.2-Year warranty. The use of Pali is not a substitute for properly winterizing your boat. Meets all ignition protection guidelines and standards (USCG, UL-1500) Safe for use in engine compartments Omnidirectional airflow discharge Dual airflow redundancy Safe thermostat temperature control: A hermetically sealed thermostat activates at 45°F (7°C) Safe, self-regulated PTC element