Used- Columbia Boiler, Model MPH-60. 255 Square feet heating surface, 18 GPH LT. Oil, Input 2,520,000 BTU/Hour, Gross Output 2,066,400 BTU/Hour. Maximum WP Steam 15 PSI, Water 30 PSI, Ran off methane 30% of the time and LP gas 70%. Last used as an emergency backup heating system for a methane digester with generator. Mfg. 2012.