Plant Utilities worked example

Boiler Fuel Switch Payback with burner and fuel train conversion cost of 312,500 $: a worked example

This scenario runs the boiler fuel switch payback calculation on the strong side: burner and fuel train conversion cost of 312,500 $, with every other input held at its documented default. Use it when reviewing boiler fuel switch payback for a utility budget, maintenance priority, capacity check, energy project, or production support plan.

The inputs for this scenario

  • Burner and fuel train conversion cost: 312,500 $ (raised for this scenario; the documented default is 125,000)
  • Annual fuel cost savings: 52,000 $ / yr (unchanged)
  • Annual service and permitting cost: 7,000 $ / yr (unchanged)

Working through the calculation

  • Applying the documented formula (Net annual savings = annual fuel cost savings - annual service and permitting cost) to the inputs above produces each figure below.
  • At this operating point the engine returns 6.94 yr for boiler fuel switch payback payback, the number this scenario is built around.
  • At this operating point the engine returns 45,000 $ / yr for net annual savings.
  • At this operating point the engine returns 312,500 $ for project or backlog investment.
  • At this operating point the engine returns -87,500 $ for five year net.

How this compares with the baseline

  • Against the tool's baseline example, where burner and fuel train conversion cost sits at 125,000 $ and the headline result is 2.78 yr, this scenario comes in 150% above the baseline at 6.94 yr.
  • Use it when evaluating a switch between gas, oil, propane, biomass, or dual-fuel firing and you need to show how fast the conversion repays itself at current fuel prices. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Boiler Fuel Switch Payback payback: 6.94 yr (headline result)
  • Net annual savings: 45,000 $ / yr
  • Project or backlog investment: 312,500 $
  • Five year net: -87,500 $

Run it with your numbers

  • Every input above is editable in the live Boiler Fuel Switch Payback calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.