29
Efficiency Measurements
There are different ways of expressing efficiency and to correctly compare values.
Combustion Efficiency - Input Based
The amount of fuel that is completely burned compared to the total amount available for combustion expressed
as a percentage.
For example:
An open bonfire; 100 pounds of wood burns and produces three pounds of ash, which equals 97
percent combustion efficiency. Good combustion efficiency but poor heating efficiency. No heat got into
the house.
Heating Efficiency - Output Based
The percentage of the heat produced that was actually absorbed into the water and transferred into the house
from the Heatmor
TM
.
Net Efficiency
This is the product of the combustion and heating efficiencies. Ninety percent combustion efficiency times 60
percent heating efficiency results in a 54 percent net efficiency.
Loading Of The Furnace
Loading the furnace relative to the heat load will result if more efficient performance. More nearly matching
your fuel load to the current temperature conditions for an 8 to 12 hour burn will result in longer burn cycles,
higher overall burn temperatures and more efficient performance. Your furnace has been rated for an 8 hour
burn cycle.
