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HOMER Grid 1.4

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Electric Heater

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The Heater page contains the cost and size inputs for a Heater. The Heater allows excess electrical production to serve loads on the thermal bus. A Heater is not required for systems with a thermal load but without it, excess electrical production is not used.


The Costs table includes the initial capital cost and replacement cost, as well as annual operation and maintenance (O&M) costs. The table also includes the size (kW) corresponding to the costs in each row. When specifying the capital and replacement costs, be sure to account for all costs associated with the Heater, including installation.


Note: The capital cost is the initial purchase price, the replacement cost is the cost of replacing the Heater at the end of its lifetime, and the O&M cost is the annual cost of operating and maintaining the Heater.

Click the Click here to enter new item option to enter additional rows in the Costs table to account for changing costs with scale.


Enter the capacities you want Homer Grid to consider for the optimal system in the Sizing table.

heater_size yourown

HOMER uses the information you enter in the Costs table to calculate the costs of each size, interpolating and extrapolating as necessary. You can see the results in the Cost Curve graph.

Other Inputs




The service life in years of the Heater

Bus Connection

Specify AC, DC, or Both for the buses from which excess electrical production can be drawn

Do not include the Heater in the optimization

This option models the Heater with infinite capacity and no cost.

Note: To the right of each numerical input is a sensitivity button (shots_sensitivity-button) that allows you to do a sensitivity analysis on that variable. For more information, see Why Would I Do a Sensitivity Analysis?

See also

Thermal Load


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