Rheem Marathon Eclipse Light-Duty non-metallic electric water heaters are designed for harsh environments and have the 10 year limited warranty to back it up. One of the most durable electric water heaters available, Marathon Eclipse is constructed of multiple layers of filament-wound fiberglass that give the tank unmatched strength and eliminates the need for an anode rod. The polyethylene outer shell resists dents, scratches and salt air. All models are field convertible to meet any Light-Duty hot water application need. Easily convert standard models from simultaneous to non-simultaneous and single phase to 3 phase. Marathon Eclipse is available in 75 Gal. 85 Gal. and 105 Gal. capacities.