Reliance Water Heater, Inlet Connection Size: 3/4 in, Outlet Connection Size: 3/4 in, BTU Rating: 50,000 Btu, Gas Type: Liquid Propane, 87 gph, Tank Capacity: 40 gal, Energy Efficiency: 0.7 %, Ignition Type: Electronic, Recovery Rate: 56 gph, Vent Type: Power, Vent Size: 2, 3, 4 in, Water Connection Location: Top, Tank Height: 70-1/4 in, Emissions: Low NOx, Housing Material: ABS/CPVC/PVC, Dimensions: 20 in Dia x 59-1/4 in H x 20 in W x 20 in D