The ProLine® XE 40-Gallon Power Vent Natural Gas Water Heater is engineered to maximize efficiency while offering greater flexibility in installation options. Featuring a 40-gallon (nominal) tank and a 40,000 BTU gas burner, the GPVL-40 Power Vent delivers a first hour rating of 73 gallons and a recovery rate of 44.7 gallons per hour. This model features a 0.67 Uniform Energy Factor and carries a 6-year limited warranty. Environmentally-friendly insulation and factory-installed heat trap nipples reduce heat loss for maximum energy savings. This ProLine® XE water heater is designed with A. O. Smith's superior commercial-grade tank protection. Advanced tank features include stainless steel CoreGard™ anode rod, Blue Diamond® glass lining and DynaClean™ automatic sediment-cleaning system, all designed to help protect the tank from the corrosive effects of water and extend the life of the water heater. A. O. Smith’s ProLine® water heaters are residential products built to commercial-grade standards and are only available for purchase through professional wholesalers and contractors.