Rheem PRO+G75-75N RH Tall Professional Classic Plus Series Heavy Duty Atmospheric Water Heater, 75-Gallon Pies Igniter - no matches required Low Emissions: Eco-friendly burner, low Knox design, Meets 40 ng/J Knox requirements Rheum exclusive R-Tech (registered) anode rod provides long-lasting tank protection All models are certified for applications up to 7,700 feet above sea level This new Model number replaces the old Model number 42V75F