Reliance 50 Gallon Tall Natural Gas Water Heater is a high-performance water heating solution designed for residential use. This tall unit features a 50-gallon capacity and operates on natural gas with a powerful 40,000 BTU rating, ensuring efficient and reliable hot water supply for a family of five. Its 1.5-inch insulation helps maintain temperature while reducing energy loss, contributing to its .60 Energy Factor for energy efficiency. The water heater measures 60-3/4 inches in height and 21 inches in diameter, making it suitable for various installation spaces from sea level up to 10,100 feet elevation. Equipped with a draft diverter outlet size of 3 inches and an integrated adapter for a 4-inch vent option, it flexible venting solutions. Safety and durability are prioritized with features like a T & P relief valve, glass-lined tank, anode rod, and PEX polymer-lined heat trap nipples. The PEX dip tube and stainless steel flame arrestor enhance performance and longevity. This model is Next Generation FVIR and includes an air intake system at the base, a door-mounted manual reset temperature cut-off, and a self-powered Honeywell Millivolt Generator gas control valve for reliable operation without external power. The Reliance 50 Gallon Tall Natural Gas Water Heater meets the new NAECA 2015 Efficiency Standards and comes with a 6-year tank and parts warranty. It is not intended for use in mobile or manufactured homes, ensuring it is suited for standard residential installations. Model Number: 6 50 NBRT