40 gallon, mobile home, natural gas/propane water heater, 35,500 btu, 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, noncfc foam insulation, factory installed pex polymer lined heat trap nipples, factory installed temperature & pressure relief valve, not for use in inside closets where a direct vent design is required, water connection is located on the side of the tank, water connection size: 3/4", vent size: 3" or 4", rated storage volume: 38, first hour rating: 59 gallons, uef: 0.58, ef: 0.62, unit dimensions: 61 3/4"h x 20"d, meets hud requirements for manufactured housing,6 year limited tank & parts warranty, 1 year labor warranty, for use with roof jack vent kit, tv# 219820, not included, but strongly recommended for installation.