Skip to content
AirPermitHub

Heaters / Heater Treaters / Boilers

Heaters & Combustion Emissions Calculator

Gas-fired heaters, heater treaters, reboilers, and other external combustion units.

Input assumptions

Activity data
MMBtu/hr
Btu/scf
hr/yr

8,760 hr/yr for potential to emit unless an enforceable limit applies.

%

Only claim control you can document and enforce.

Emission factor

Combustion factors are commonly expressed per million standard cubic feet of fuel. Cite the publication section and revision date, and use the heating value that factor assumes.

lb/MMscf

Calculation result

Enter heat input, fuel higher heating value, emission factor to see results, or fill demo values to explore.

Calculation methodology

Heat-input method. Converts firing rate to fuel volume using the fuel's higher heating value, then applies a volume-based factor. (Btu/scf is numerically equal to MMBtu/MMscf.)

E (lb/hr) = EF (lb/MMscf) × Q (MMBtu/hr) ÷ HHV (Btu/scf)
Emission factor
Emission factor: — lb/MMscf
Source / reference
Not provided. Results without a cited factor are not defensible.

Calculation set

Add several sources or pollutants and total them. Stored in this browser tab only until accounts launch.

No calculations added yet.

Native Excel and PDF exports with full methodology arrive with saved accounts. Phase 2

AirPermitHub provides educational, engineering, research, and compliance-support information. Information provided by the platform does not constitute legal advice and should not replace review of applicable regulations, permits, agency guidance, or consultation with qualified professionals. Full disclaimer