Twin Hornet 45 700w Boat Bilge Engine Compartment Heater This is the only DUAL COMPONENT heater on the market. It features TWO: heating modules, fans and thermostats. This provides twice the protection of every other heater. Made in the USA and certified to meet U.S. Coast Guard ISO 8846 requirements. Full 3 year warranty - longest in the industry only WATERPROOF BILGE HEATER MADE, competing units are NOT waterproof SAFE self-temperature regulating heating modules, waterproof fans, controllers & thermostats make ours the best choice Our warranty is 50% longer than the competition, it's a fact that higher quality parts last longer DO NOT take a chance with other heaters that are IMPORTED and may not be CERTIFIED by the US Coast Guard for safe operation in a boat's bilge