For engine spaces to 350 cu. ft. Power Output 450W Size (L x W x H)" 8 x 4 x 5-1/8 XTREME forced air heaters are small, highly efficient marine engine compartment heaters that will protect your boat from the threat of sudden freezes for a never-ending boating season. Our boat heaters helps to extend battery life and also keeps your engine compartment and its critical components warm and dry. Compact size is designed to fit easily in any size boat. Is self regulating and therefore energy efficient. Heater uses an automatic thermostat. Never winterize your boat again! Pre-wired. Tested for the ignition protection requirements of the ABYC E11, the USCG, ISO 8846 and SAE J1171. Made in USA.