Boiler Guide

105
Helpful Conversion Factors
for Heating Systems
MultIply by to obtain:
Atmosphere (atm) 14.70 Ib. per sq. in. (psi)
Boiler Horsepower 34.50 pounds steam/hr @ 212°F.
Boiler Horsepower 33,475 BTU per hour
Cubic feet (cu. ft.) 7.481 gallons (gal.)
Degrees–Centigrade (°C) (°Cx1.8) + 32 degrees–Fahrenheit (°F)
Degrees–Fahrenheit (°F) (°F -32) x 5/9 degrees–Centigrade (°C)
Gallon, # 2 Oil 7.1 pounds (Ibs.) approx.
Gallon, Water B.337 pounds (Ibs.)
Horsepower .3 GPH
Horsepower–U.S. & British 33,000 foot pounds per minute
Horsepower–U.S. & British 42.42 BTU per minute
Inches Mercury (in. Hg) 13.60 inches water (in. w.c.)
Inches Mercury (in. Hg) 0.4912 pounds per square in. (psi)
Inches Water (in. w.c.) 0.0735 inches mercury (in. Hg)
Inches Water (in. w.c.) 0.0361 pounds per square in. (psi)
Kilocalorie (kcal) .0284 GPH
Kilocalorie (kcal) 3.968 BTU
Kilogram/hr (kgh) .3125 GPH
Kilowatt (kw) .0244 GPH
Kilowatt hours (kwh) 3,413 BTU
Kilowatt (kw) 1.341 horsepower –U.S. & British
Liter .2642 GPH
Pound–Steam @ 212°F 970.3 BTU (heat of evaporation)
Sq. Ft. Steam 240 BTU
Sq.Ft.Water 150 BTU
Watt Hour (whr) 3.413 BTU
Divide... by... to obtaIn:
BTU input 140,000 GPH #2 Oil
Gross Sq. Ft. Steam 360 GPH #2 Oil
Net BTUH (Output) 112,000 GPH #2 Oil
Net MBH (Output) 112 GPH #2 Oil
Net Sq. Ft. Steam 466 GPH #2 Oil
Sq. Ft. Heating Surface 27 GPH #2 Oil