How do you calculate boiler efficiency savings?

Multiply the annual MMBtu of fuel avoided by the delivered fuel cost and the capture rate to get captured savings. With 4,200 MMBtu at $9.40 and an 88 percent capture, that is $34,742.40 of captured fuel value.

What is a savings capture rate?

It is the fraction of modeled savings you actually realize on the bill, accounting for operating variance, weather, and persistence. An 88 percent capture means you bank 88 cents of every modeled dollar.

What does the net figure represent here?

In this tool the net combines captured fuel savings with the implementation and verification cost line. In the example, $34,742.40 captured plus the $6,500 line yields $41,242.40; treat the cost line per your own sign convention when reporting payback.

What is savings per avoided MMBtu?

It is the net result divided by MMBtu reduced, here about $9.82 per MMBtu, slightly above the raw fuel cost because the fixed cost line is spread across the avoided energy.

How do I pick a realistic capture rate?

Base it on past M&V results: well-instrumented, persistent measures like economizers often capture 85 to 95 percent, while behavioral or tuning-dependent measures may capture 60 to 80 percent.

Why include implementation and verification cost?

Because savings net of cost is what finance evaluates. Metering, commissioning, and M&V are real spend, and ignoring them overstates the return on an efficiency project.

Energy & Sustainability calculator

Boiler Efficiency Savings Calculator

Boiler efficiency savings projects the dollar value of cutting boiler fuel use through measures like economizers, blowdown heat recovery, burner tuning, or condensate return. Energy managers and facilities engineers use it to rank projects, build capital requests, and set realistic expectations for what gets banked versus what evaporates to operational variance. The capture rate is the honest part: not every modeled MMBtu shows up on the bill, and this calculator forces you to discount for that. By netting in implementation and verification cost, it gives a savings figure a finance team will actually accept rather than an optimistic engineering best case.

What this calculator does

Estimate boiler fuel savings from annual fuel use, fuel cost, savings capture, and implementation cost.
an energy or maintenance manager needs to value a boiler efficiency improvement
It values the fuel actually captured (MMBtu reduced times fuel cost times capture rate) and combines it with the implementation and verification cost line to report a net savings figure.

Formula used

Captured boiler fuel savings = annual boiler fuel use reduced × delivered fuel cost × savings capture rate
Net boiler efficiency savings = captured boiler fuel savings + implementation and verification cost

Inputs explained

Annual boiler fuel use reduced:
Delivered fuel cost:
Savings capture rate:
Implementation and verification cost:

How to use the result

Use it when justifying a boiler efficiency measure, comparing competing projects, or reconciling modeled versus realized savings during measurement and verification.
The capture rate is a judgment input; if you set it too high the savings are overstated. Real fuel prices also escalate, so a single-year figure understates multi-year value.

Current U.S. benchmarks

Industrial electricity averages 8.66 cents per kWh across the U.S. (EIA, Apr 2026), up 5.5% from a year earlier. Energy-intensive steps carry this directly into unit cost.

Common questions

How do you calculate boiler efficiency savings? Multiply the annual MMBtu of fuel avoided by the delivered fuel cost and the capture rate to get captured savings. With 4,200 MMBtu at $9.40 and an 88 percent capture, that is $34,742.40 of captured fuel value.
What is a savings capture rate? It is the fraction of modeled savings you actually realize on the bill, accounting for operating variance, weather, and persistence. An 88 percent capture means you bank 88 cents of every modeled dollar.
What does the net figure represent here? In this tool the net combines captured fuel savings with the implementation and verification cost line. In the example, $34,742.40 captured plus the $6,500 line yields $41,242.40; treat the cost line per your own sign convention when reporting payback.
What is savings per avoided MMBtu? It is the net result divided by MMBtu reduced, here about $9.82 per MMBtu, slightly above the raw fuel cost because the fixed cost line is spread across the avoided energy.
How do I pick a realistic capture rate? Base it on past M&V results: well-instrumented, persistent measures like economizers often capture 85 to 95 percent, while behavioral or tuning-dependent measures may capture 60 to 80 percent.

Last reviewed 2026-05-12.