Lochinvar® KNIGHT® Fire Tube Boiler Boiler With ECM Pump, Model: WHB155, 120 V, 2.2 A, 60 Hz Frequency, 1 ph, 95 % AFUE, 155000 Btu/hr BTU, 3.2 gal Capacity, 15 gpm Flow Rate, 80 psi Pressure, MNPT Connection, Natural Gas Fuel, Direct Vent, Modulating Burner, Chimney/Breeching/Vent Size: 3 in, 144000 Btu/hr DOE Heating, Ignition System: Direct Spark, Direct Spark Ignition, Net BTU Rating: 125 mbh, Number of Boilers: 8, 14.07 sq-ft Area, Wall Mounting, Stainless Steel, Dimensions: 41-1/4 in H x 18-3/4 in W x 19-1/8 in D, Additional Information: 1/2 in Gas Connection, 1 in Water Connection