Essential Series Gas Water Heater, Natural Gas, 40 gal Tank, 52 gph, 36000 Btu/hr BTU, Dark Warm Gray Richmond Essential Gas Water Heater, Inlet Connection Size: 3/4 in, Outlet Connection Size: 3/4 in, BTU Rating: 36000 Btu/hr, Gas Type: Natural Gas, 52 gph, Tank Capacity: 40 gal, Energy Efficiency: 0.58, Recovery Rate: 36.4 gph, Vent Type: Atmospheric, Vent Size: 3, 4 in, Water Connection Location: Top, Gas Connection Height: 14-1/4 in, Tank Height: 58-1/2 in, Emissions: Ultra-Low NOx, Dark Warm Gray, Dimensions: 19 in W x 58-1/2 in H, Includes: Temperature and Pressure Relief Valve Product DetailsB T U Rating: 36000 Btu/hrColor: Dark Warm GrayDimensions: 19 in W x 58-1/2 in HEmissions: Ultra-Low NOxEnergy Efficiency: 0.58Flow Rate: 52 gphGas Connection Height: 14-1/4 inGas Type: Natural GasIncludes: Temperature and Pressure Relief ValveInlet Connection Size: 3/4 inOutlet Connection Size: 3/4 inRecovery Rate: 36.4 gphTank Capacity: 40 galTank Height: 58-1/2 inVent Size: 3 4 inVent Type: AtmosphericWater Connection Location: Top Available at MDH Lumber - Crofton Lumber in Nebraska and Akron Lumber in Iowa. Fast local delivery available.