Reliance Short Gas Water Heater, 3/4 in Inlet, 40,000 Btu, Natural Gas, 79 gph, 50 gal Tank, Energy Efficiency: 0.72, Ignition Type: Electronic, Recovery Rate: 45 gph, Vent Type: Power, Vent Size: 4 in, Water Connection Location: Top, Tank Height: 50-3/4 in, Emissions: Low NOx, Dimensions: 24 in Dia x 60-1/8 in H, Includes: (1) Vent Kit