Boiler Efficiency Calculator
Calculate boiler efficiency, heat rate, fuel cost, and annual savings from efficiency improvements.
Boiler Parameters
η = (msteam × Δh) / (mfuel × HHV) × 100
Performance Results
Boiler Efficiency
--
Heat Rate
--
Steam Enthalpy
--
Fuel Energy Input
--
Steam Energy Output
--
Feedwater Enthalpy
--
Cost Analysis
Cost per 1000 lb Steam
--
Hourly Fuel Cost
--
Annual Fuel Cost
--
Savings from 1% Efficiency Improvement
Annual Fuel Savings
--
New Efficiency
--
New Annual Cost
--
Annual Cost vs. Efficiency
How this was calculated
Direct method: Efficiency = (Steam energy output / Fuel energy input) × 100. Steam energy = mass_flow × (h_steam - h_feedwater).
Steam enthalpy: Approximated from pressure using simplified saturated steam tables. Feedwater enthalpy from temperature.
Heat rate: Fuel energy input per unit steam energy output (BTU/BTU).
Assumptions: Saturated steam at stated pressure. No blowdown losses in this simplified model. HHV (higher heating value) basis.
Need help with boiler optimization, energy audits, or AI-driven process analytics for your facility?
Book a free strategy call →Understanding Boiler Efficiency
Boiler efficiency measures how effectively a boiler converts fuel energy into useful steam energy. Typical industrial boilers operate between 75-85% efficiency, with modern high-efficiency units reaching 90%+ on natural gas. Even small improvements in efficiency yield significant fuel cost savings given the large energy throughput of industrial steam systems.
The direct method (input-output method) compares the total energy output in steam to the total energy input from fuel. Losses include stack losses (flue gas heat), radiation losses, blowdown losses, and unburned fuel. A 1% efficiency improvement on a 50,000 lb/hr boiler can save $30,000-$80,000 annually depending on fuel type and price.
All calculations run in your browser. Built by Groundwork Analytics. info@petropt.com.