Cost Saving Chart

Fuel Type	System Efficiency	Units/Mil BTU	Local Cost Per Unit	Cost per 100,000,000 BTU's
Wood	60%	0.069 cords	x	=
Corn	75%	3.40 Bushels	x	=
Wood Pellet	75%	0.083 Tons	x	=
Fuel Oil	86%	8.38 Gallons	x	=
Propane	92%	11.38 Gallons	x	=
Natural Gas	92%	10.870 Therms	x	=
Electric Off-peak	100%	292.912 kwh	x	=

Source: Northwest Manufacturing, Inc. Assumptions include normal end-use efficiencies, generally-accepted efficiency levels, fuel costs and output. 100,000,000 BTU's is an average BTU rating to heat a 2,000 square foot home for one heating season.