Cyclotherm Low Pressure Firetube Boiler. Model: C3500C-2N-23. S/N: 15459. Nat'l Bd: 11837. In service until 11/9/1997. Steam capacity: 3450 lbs/hr. MAWP: 150 psi. Heating surface area: 306 sq. ft. Plate: 3/8 in. Head: 9/16 in. Oil Pump with Motor, 1/2 hp, 1725/1425 rpm, 208-220/440 V, 1.8-0.9/0.4 amps, 60/50 Hz, 3 phase. Cyclotherm boilers are quick and easy to install and maintain. They offer unmatched levels of performance efficiency and operational cost benefits. Cyclotherm boilers fire up to operating pressures in short time periods from cold starts and burn cleaner as well. Strong fabricated steel construction and foolproof fuel system and firing controls. Inlets: (1) 1-1/2 in. dia. port (water supply), (1) 3 in. dia. FNPT (gas-oil). Outlets: (1) 1-1/2 in. dia. NPT (male, relief valve), (1) 4 in. dia. steam port with a 10 in. flange and (8) 7/8 in. dia. thru-holes at 3 in. dia. center distances, (1) 24 in. L x 8 in. W exhaust vent. Overall dimensions: 13 ft. 6 in. L x 78 in. W x 77 in. H.