The Rheem XE28S06STB38U1 is a compact, high-efficiency electric water heater tailored for space-constrained areas, featuring a 28-gallon short-profile tank perfect for small households or tight installations. It delivers energy-smart performance with a UEF of about 0.92, dual 3,800-watt copper heating elements, and an isolated tank design for reduced heat loss. Expect reliable delivery of hot water—around 33–62 gallons in the first hour and up to 21 GPH recovery at a 90 °F rise—alongside long-term durability thanks to its premium-grade anode rod and safety-minded components like a factory-installed T&P relief valve, over-temperature protector, and low-lead compliance. Installation is simplified with a conveniently placed junction box, and the model comes backed by a 6-year limited tank and parts warranty plus 1-year in-home labor.