Sellers Engineering Company Immersion Gas Fired Hot Water Boiler. Model: 15 Commodore C – 20 – W. S/N: 8351. Nat’l Bd: 6444. Input 837,000 Btu, output 670,000 Btu. Normal water capacity: 147 gal. MAWP Water: 100 psi. Heat transfer surface area: 42.4 sq. ft. (12) 2 in. dia. tubes. Blower pressure (water column): 5 in. H2O. Manifold pressure (water column): 4.4 in. H2O. Baldor Industrial Motor, 1 hp, 3450 rpm, 115/230 V, 14.6/7.7 amps, 60 Hz, single phase. Inlets: (1) 1-1/2 in. dia. bevel port, (1) 1 in. dia. water supply port, (1) 2-1/2 in. dia. flanged steam port. Outlets: (1) 7-1/2 in. dia. steam supply vent, (1) 1-1/4 in. dia. pressure steam release valve, (1) 1 in. dia. NPT water return. Overall dimensions: 11 ft. 8 in. L x 47-1/2 in. W x 58-1/2 in. H. (ACN210).