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U.S. Department of Energy
Washington, DC. USA

Operating your boiler with an optimum amount of excess air will minimize heat loss up the stack and improve combustion efficiency. Combustion efficiency is a measure of how effectively the heat content of a fuel is transferred into usable heat. The stack temperature and flue gas Oxygen (or Carbon Dioxide) concentrations are primary indicators of combustion efficiency.

Natural Resources and Office of Energy Efficiency
Typically, reducing O2 in the flue gas by 1 percent- for example, from 5 percent to 4 percent- increases boiler efficiency by about 2.5 percent.

Controlling excess air is the most important tool for managing the energy efficiency and atmospheric emissions of a boiler system.

As graph shows, the effect of air temperature on excess air in the flue gas can be dramatic.



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