Heat Treatment, Furnaces & Thermal Processing calculator

Furnace Payback Calculator

Estimate how many years of consistent savings recover the installed furnace investment. Enter annual gross savings, additional support cost and your screening limit.

What this calculator does

  • Screen a furnace investment using net annual cash savings and your accepted simple payback limit.

Formula used

  • Net annual savings = annual gross savings − additional annual support cost
  • Simple payback = installed investment ÷ positive net annual savings
  • Five-year net benefit = 5 × net annual savings − installed investment
  • Five-year simple ROI = five-year net benefit ÷ installed investment × 100
  • Payback margin = maximum accepted payback − simple payback

Inputs explained

  • Installed Furnace Investment: Complete installed project estimate, including commissioning.
  • Annual Gross Savings: Annual cash savings before added support costs.
  • Additional Annual Support Cost: Incremental annual cost caused by this project.
  • Maximum Accepted Payback: Your project screening limit in years.

How to use the result

  • Best suited to furnace replacement screening, efficiency project comparison.
  • Excludes financing, discounting, taxes, residual value and ramp-up timing. Nonpositive annual net savings cannot recover a positive investment.

Current U.S. benchmarks

  • Industrial electricity averages 9.77 cents per kWh across the U.S. (EIA, Jul 2026), up 4.7% from a year earlier. Energy-intensive steps carry this directly into unit cost.

Common questions

  • Why is payback blank? Net annual savings must be positive. Zero or negative annual benefit does not recover the positive initial investment.
  • Is five-year ROI an annual return? No. It is the undiscounted five-year net benefit divided by the initial investment.
  • Should support costs include existing expenses? Include only incremental costs caused by the project, unless your gross savings estimate explicitly removed those existing expenses.
  • Can this choose the best furnace investment? No. Projects with different lives, timing and risk require a fuller cash-flow comparison.

Last reviewed 2026-10-06.