Boiler Combustion Efficiency Calculator

Calculate boiler combustion efficiency from flue gas measurements. Enter stack temperature, O2 or CO2 readings, and fuel type to get efficiency percentage, excess air, and stack heat losses using the Siegert method per ASME PTC 4.

Supports natural gas, #2 oil, #6 oil, and propane. Results include stack losses, excess air percentage, and fuel savings from tune-ups. Optional seasonal efficiency deductions account for jacket/radiation losses and cycling losses. Interactive chart shows how efficiency varies with stack temperature and excess air.

Useful for energy audits, boiler tune-up verification, and documenting baseline vs. post-retrofit combustion performance.