Reliance Short Gas Water Heater, 3/4 in Inlet, 40,000 Btu, Natural Gas, 73 gph, 40 gal Tank, Energy Efficiency: 0.67, Ignition Type: Electronic, Recovery Rate: 45 gph, Vent Type: Power, Vent Size: 4 in, Water Connection Location: Top, Tank Height: 49-5/8 in, Emissions: Low NOx, Dimensions: 22 in Dia x 59 in H, Includes: (1) Vent Kit