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HOMER Pro 3.10



Important: The Boiler is part of the Combined Heat and Power module. See Adding Modules for more information on purchasing modules.

The Boiler page allows you to add a boiler to the model. You can add emissions information and manage fuels. HOMER requires you to add a boiler to the system whenever you have a thermal load.

HOMER considers serving thermal load to be less important than the serving electric load. When dispatching generators to serve the electric load, HOMER considers the value of any usable waste heat that can be recovered from each generator, but it does not dispatch a generator simply to serve the thermal load. It assumes the boiler can serve any thermal load that the generators do not. In other words, HOMER treats the boiler as a backup source of heat that can serve any amount of thermal load whenever necessary.


Enter the fraction of the fuel's energy that gets converted to heat in the boiler.

Fuel Resource

The Boiler drop-down menu contains all the fuels stored in your Component Library. Choose the appropriate fuel from this list. When you choose a fuel from the drop-down menu, detailed properties of the selected fuel appear.


Note: You can create a new fuel type and remove or redefine an existing fuel in the library.

Fuel Price

Enter the price for the chosen fuel, and add sensitivity values for this cost. The units, either in $/L or $/m3, depend on the fuel.

Emissions Factors

In the Emissions section, you can modify the following variables.



Carbon Monoxide

The quantity of carbon monoxide (in grams) emitted per unit of fuel consumed by the boiler

Unburned Hydrocarbons

The quantity of unburned hydrocarbons (in grams) emitted per unit of fuel consumed by the boiler

Particulate Matter

The quantity of particulate matter (in grams) emitted per unit of fuel consumed by the boiler

Proportion of sulfur converted to PM

The fraction of the sulfur in the fuel that is emitted as particulate matter (the rest is emitted as sulfur dioxide)

Nitrogen Oxides

The quantity of nitrogen oxides (in grams) emitted per unit of fuel consumed by the boiler

See also

How HOMER Calculates Emissions