Lochinvar® KNIGHT® Fire Tube Boiler High Altitude Boiler With ECM Pump, Model: WHB285, 120 V, 3.60 A, 60 Hz Frequency, 1 ph, 95 % AFUE, 285000 Btu/hr BTU, 4.9 gal Capacity, 27 gpm Flow Rate, 80 psi Pressure, MNPT Connection, Natural Gas Fuel, Direct Vent, Modulating Burner, Chimney/Breeching/Vent Size: 3 in, 264000 Btu/hr DOE Heating, Ignition System: Direct Spark, Direct Spark Ignition, Net BTU Rating: 230 mbh, Number of Boilers: 8, 21.6 sq-ft Area, Wall Mounting, Stainless Steel, Dimensions: 41-3/4 in H x 18-3/4 in W x 21-1/8 in D, Additional Information: 1/2 in Gas Connection, 1-1/4 in Water Connection