The ProLine series Gas Water Heater is designed to deliver an economical performance that can lower your energy bill and also provide long lasting value. Featuring a 50 gal (nominal) tank and a 40000 Btu/hr gas burner, the GSX-50-BRT atmospheric vent deliver a first hour rating of 81 gal and a recovery rate of 41 gph. With an 0.62 Uniform ENERGY FACTOR, this water heater is not ENERGY STAR certified. It carries a 10 years limited tank warranty and meet Low NOx emission requirement.