Heating System Comparison Calculator
Compare lifetime cost of different heating systems.
Compare lifetime cost of gas boiler vs heat pump vs electric heating. See full ownership cost over typical 15-year lifespan.
What this tool does
Lifetime cost of two heating systems combines install cost with annual running cost across the lifespan. Given install cost for systems A and B, annual running cost for each, and lifespan in years, this calculator returns the total lifetime cost of each system plus the difference between them. The result shows what you'd spend from purchase through the full operating period under the assumptions you enter. Installation cost and annual running expenses are the primary drivers—small changes in either can shift the total considerably. A typical scenario might compare a conventional system with lower upfront cost but higher annual fuel consumption against an alternative with higher initial investment but lower yearly operating expenses. The calculation assumes costs remain constant across the period and doesn't factor in maintenance variability, efficiency changes over time, or replacement of components. Results are for illustration only.
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Heating system choice has long financial implications. Gas boiler 2,500-4,500 + 1,500/year running. Heat pump 8,000-15,000 + 800/year running. Electric 1,500 + 2,500/year running. Over 15 years, totals diverge significantly.
What the result means
Lifetime cost of each system. Cheaper option wins. Often heat pump cheapest long-term despite higher install. Gas competitive shorter-term. Electric typically most expensive.
A worked example
With the defaults: system a install cost of 3,500, system a annual running of 1,500, system b install cost of 12,000, system b annual running of 800. The tool returns System B. You can adjust any input and the result updates as you type — no submit button, no reload. That's the real power here: seeing how sensitive the output is to one or two assumptions.
What moves the number most
The result responds to System A Install Cost, System A Annual Running, System B Install Cost, System B Annual Running, and Lifespan. Two inputs usually tip the answer one way or the other. Flipping each value past a round threshold shows which input moves the result most.
The formula behind this
Each lifetime = install + annual × years. Lower wins. Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.
Cost vs value in green choices
Sustainable options usually cost more upfront and less over time. This tool separates the two so the comparison is fair — looking at purchase price alone consistently makes the green option look worse than it is once lifetime costs are tallied.
What this doesn't capture
Carbon reduction, health benefits, and local air quality have real value the financial figure doesn't price. The calculation gives the money side honestly; for the full picture, note the non-financial benefits alongside.
Comparing £3,500 install and £1,500 annual running costs over 15 years results in System B lifetime expense difference.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
The calculator computes the total lifetime cost for each heating system by adding the installation cost to the product of annual running costs and system lifespan in years. This models the sum of upfront capital expenditure and cumulative operational expenses over the chosen period. The system with the lower total lifetime cost is identified as the lower-cost option. The calculation assumes constant annual running costs throughout the lifespan, with no inflation adjustment, no maintenance or replacement costs beyond the stated annual figure, and no variation in energy prices or usage patterns. The model treats both systems as operating continuously at consistent expense levels and does not account for financing costs, tax implications, or potential salvage value at end of life.
Frequently Asked Questions
Heat pump grants?
Heat pump for old homes?
Gas boiler future?
Electric heating worth it?
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