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Home Service FAQs FAQ of gas-fired(oil-fired) boilers What impact will excess air have on boiler performance?

What impact will excess air have on boiler performance?

03 Jan 2020

Excess air provides safe operation above stoichiometric conditions. A burner is typically set up with 15% to 20% excess air in higher firing ranges. Higher excess air levels result in fuel being used to heat the air instead of transferring it to usable energy, increasing stack losses and significantly decreasing efficiency. Boilers with lower excess air throughout the operating range have higher efficiencies.

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