Extend the boating season, and protect your engine against surprise cold snaps prior to winterization. The Pali engine compartment heater utilizes a self-regulating PTC heating element that cannot overheat. Specially designed unit allows air to flow in all directions to more evenly distribute warmth. Heater meets all ignition protection guidelines and standards which ensure safe use in the marine engine compartment and is the only heater of its type that fully meets safety compliant UL and CSA standards. Utilizes an internal hermetically sealed thermostat to turn the heater on before 41°F (5°C) and off before 60°F (15°C). Continuously protects engine compartments up to 80 cubic feet at -4°F (-20°C) outside ambient temperature. 9"L x 5"W x 4.8"H.