The Rheem Marathon electric water heater is a non-metallic unit designed not to rust or corrode. It has a seamless, blow molded polybutene inner tank wrapped in a filament-wound fiberglass outer tank designed for flexibility to withstand pressure. The Marathon requires no anode rod to resist corrosion, while the titanium lower and copper upper elements resist lime buildup for efficient operation. The Marathon contains two and a half inches of insulation to reduce heat loss and increase efficiency. The unit is rated at .90 – .94 EF and is available in 40, 50, 50 Short, 85 and 105 gallon models. The Marathon provides an FHR of 52-104 gallons, depending on the model capacity.
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