The Rheem Professional Classic Series Heavy Duty Ultra Low NOx water heaters are designed for robust performance and environmental compliance. Available in 75 and 98 gallon models, these units feature a cord-free design for convenient installation. Certified for applications up to 10,000 feet above sea level, they are suitable for various high-altitude environments. Side water connections further enhance versatility, enabling use in space heating applications alongside their primary function of providing reliable hot water.