The Marathon® 50-Gallon Lifetime** electric water heaters provide hot water with peace of mind. Plastic tank eliminates the need for anode rod and prevents smelly water. Multiple layers of filament wound fiberglass give the tank unmatched strength and increased insulation to reduce energy consumption. Rigid foam insulation covers entire tank for maximum efficiency. Bowl-shaped tank bottom drains completely for easy service and sediment removal. Lower titanium heating element for superior resistance to lime buildup. Factory installed temperature and pressure relief valve offers added protection. Lifetime limited warranty on tank and 6-year limited warranty on parts. Meets or exceeds National Appliance Energy Conservation Act (NAECA) and UL requirements. Lifetime** limited warranty on tank and 6 year limited warranty on parts.