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BOILER EFFICIENCY IN STANDARD UNITS          * 1 BHP = 34.5 lbs steam/hr        * 1 BHP = 33,472 Btu/hr        * 1 BHP = 139.5 sq.ft. E.D.R. (steam)        * 1 Sq.Ft. E.D.R. (steam) = 240 Btu/hr        * 1 Sq.Ft. E.D.R. (hot water) = 150 Btu/hr        * 1 Lb. steam (from and @ 212 °F) = 970 Btu/hr        * 1 Therm = 100,000 Btu          AT 80% FUEL TO STEAM EFFICIENCY        Hourly fuel consumption per BHP:          * No.6 Oil: 152,000 Btu/gal. = 0.275 gallon/BHP/hr        * No.5 Oil: 149,000 Btu/gal. = 0.280 gallon/BHP/hr        * No.2 Oil: 142,000 Btu/gal. = 0.295 gallon/BHP/hr        * 1000 Btu/cu ft Gas = 42 cu ft/BHP/hr        * 800 Btu/cu ft Gas = 53 cu ft/BHP/hr        * 500 Btu/cu ft Gas = 84 cu ft/BHP/hr        * Therms = 0.42 therms/BHP/hr          * 1 BHP = 15.6 Kg steam/hr (from and @ 100 °C )                       = 8,436 Kg cal/hr          AT 80% FUEL TO STEAM EFFICIENCY        Hourly fuel consumption per BHP:          * No.6 Oil: 9,987 Kg cal/L        * No.2 Oil: 9,321 Kg cal/L        * 8,898 Kg cal/cu.m. Gas   Fuel Type Oil Gas          Boiler Output (BHP)        Boiler Efficiency (%)        Type of Gas Digester gas Natural Gas Butane Propane     Oil Grade Light Oil Heavy Oil     Oil Cost/Gal (US $) Gas Cost/therm (US $) Oil Cost/lt (US $) Gas Cost/cu m (US $)        Annual hours run         From and @ 212 °F       From and @ 100 °C   Steam Output lbs/hr Max Output Btu/hr     Steam Output Kg/hr Max Output Kg cal/hr         Steam cost/1000 lbs Max Oil burning rate Gal/hr     Steam cost/1000 lbs Max Gas burning rate therm/hr     Steam cost/1000 Kgs Max Gas burning rate cu m/hr     Steam cost/1000 Kgs Max Oil burning rate lts/hr             Calculation Results     Annual 'Steam Cost' is:     Compare with an alternate boiler efficiency %.   Alternate Boiler Efficiency (%)              'Steam Cost' difference is: