Ideal Heating Combi Boiler, Model: Exalt, 120 V, 10 A, 60 Hz Frequency, 1 ph, 95 % AFUE, 155000 Btu, 3 gal Capacity, 0.5 gpm Flow Rate, 150 psi Pressure, MNPT Connection, Natural Gas Fuel, Automatic Air Vent, Premix Burner, Chimney/Breeching/Vent Size: 3 in, 142 mbh DOE Heating, Ignition System: Direct Spark, Direct Spark Ignition, Net BTU Rating: 123 mbh, Number of Boilers: 4, Wall Mounting, Stainless Steel, 185 deg F, Dimensions: 33 in H x 21-3/4 in W x 16-1/2 in D, Additional Information: 3/4 in Gas Connection, 1 in Supply or Return Connections