The Rheem XG50T09HE40U0 is a 50-gallon tall natural gas water heater from Rheem's Performance Plus series, designed for households with moderate to high hot water demands. It features a 40,000 BTU/hour input and a Uniform Energy Factor (UEF) of 0.62, ensuring efficient operation. The unit offers a First Hour Rating (FHR) between 71 and 84 gallons, and a recovery rate of up to 40.4 gallons per hour at a 90°F rise, depending on the model. Equipped with a self-powered diagnostic gas control valve, it enhances monitoring and servicing capabilities. The burner system is eco-friendly, meeting 40 ng/J NOₓ emissions standards, and is maintenance-free with no filter to clean. Additionally, the premium-grade anode rod provides long-lasting tank protection. The unit is certified for high-altitude installations up to 6,000 ft, with some models certified up to 10,200 ft above sea level. It includes a temperature and pressure relief valve and is low lead compliant. Backed by a 9-year limited warranty for tank and parts, plus a 2-year full in-home labor warranty, the XG50T09HE40U0 combines durability, safety, and energy-efficient performance.