The Rheem Professional Prestige Series Powered Damper Ultra Low NOx water heaters combine high efficiency with reduced emissions, featuring a .64 - .68 Uniform Energy Factor (UEF). These models are designed to minimize energy costs while meeting stringent environmental standards. Ideal for homeowners looking to lower their carbon footprint, they offer reliable hot water supply in 38 and 50 gallon capacities. The powered damper technology enhances efficiency by optimizing heat retention, providing sustainable and cost-effective water heating solutions for residential use.