The Rheem XG55T06EC50U0 is a full-capacity, 55-gallon tall natural gas water heater from the Performance Series, designed for high-demand households with reliable performance and efficiency. With a Uniform Energy Factor (UEF) between 0.58–0.66, this unit delivers powerful hot water output—providing 55–97 gallons in the first hour and a recovery rate up to 51 gallons per hour at a 90°F rise—making it ideal for homes with 5 or more occupants. It’s equipped with a self-powered diagnostic gas control valve, a low-NOx burner meeting stringent emissions standards, and a maintenance-free burner system that automatically shuts off for safety in the presence of flammable vapors. Additional features include a premium-grade anode rod for extended tank life, easy match-free ignition, T&P relief valve, and low-lead components for safety and compliance. Backed by a 6-year limited warranty on both tank and parts, plus 1 year of in-home labor coverage, this model blends durability, performance, and peace of mind.