40 gallon, tall, natural gas water heater, max btu's input: 40,000, low nox emissions, electronic gas control valve that provides precise temperature control & operational status, piezo igniter allows for easy 1 hand pilot ignition without matches, pex dip tube, glass lined tank with anode rod protects against corrosion, shipped from the factory with an insulation blanket, non-cfc foam insulation, factory-installed pex polymer lined heat trap nipples, factory-installed temperature & pressure relief valve, self cleaning tank, rated storage volume: 38, first hour rating: 78 gallons, water connection location is located at the top of the tank, water connection size: 3/4, vent size: 3 or 4", uef: 0.65, ef: 0.62, unit dimensions: 62"h x 18"d, 6 year limited tank & parts warranty, 1 year labor warranty.