Rheem, 22V50F1, Whole House, N/A, Fury, Water Heaters, Gas/Propane Fury Collection Residential Natural Gas Water Heater with Tall 50 Gallon Tank 38000 Max BTU InputGuardian System-Rheem s Guardian System provides double protection, shutting off both air and fuel systems should it detect the presence of flammable vapor accumulation. This system is also maintenance free with no filter to clean.Longer Tank LifeStandard anode rods help protect water heater tanks from rust. This unit uses a patented magnesium anode rod design that incorporates a special resistor, resulting in longer tank life.Self-CleaningPatented EverKleen- system fights sediment build-up which helps to reduce fuel cost and provide more hot water.Low EmissionsFury s eco-friendly burner is a low nitrous oxide emission design, meeting 40 ng/J emission requirementsSpecifications:Tank Capacity: 50 GallonsEnergy Factor: 0.58Performance:First Hour Rating: 90 gallonsRecovery at 90 degree rise: 38.4 Gallons/HourMax BTU Input: 38000Altitude Certification: 6000 ft. above sea levelWarranty: 6 Year Limited Tank - 6 Year Limited PartsRheem has been manufacturing water heaters since the 1930 s, with coast to coast distribution by 1936. Their product offerings cover commercial and residential heating, cooling, solar water heating systems, conventional storage-style water heaters, tankless water heaters, replacement parts and accessories. Rheem s manufacturing facilities are ISO 9001 certified, with four facilities in the United States. Choose an industry leader that is respected for reliability. Choose Rheem.