Xtreme Heaters XXHEAT Silver Medium Xtreme Mar Heaters 450W SAFEST WAY TO PREVENT FREEZING ENGINES. Unlike home space heaters or light bulbs, our Xtreme boat bilge heaters are designed and tested for a harsh, enclosed engine space full of salt, moisture, and gas fumes. ENGINEERED FOR EFFICIENCY. This 450W Xtreme engine compartment heater combines true forced air circulation with latest PTC technology in its heating core. This ensures consistent temperatures through the entire engine space. EASY INSTALLATION. Xtreme Heaters have a compact size for temporary or permanent installation. Mount at any angle, including upside down and sideways. Includes 20-foot marine rated electric power cord with standard 3-prong outlet plug. BUILT TO LAST IN HARSH MARINE ENGINE COMPARTMENTS. Get lifetime of service from the fully anodized aluminum case for corrosion resistance, electronics module sealed against moisture, a marine-rated power cord, and our water resistant high power fan. ABYC, USCG, AND MILITARY SAFETY CERTIFICATIONS. Independently tested to meet ignition protection requirements of ABYC E11, USCG, ISO 8846, SAE J1171. Xtreme Heaters are tough enough to pass US MIL-SPEC 810E test and are used in military vessels.