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Boiler Replacement Payback Calculator

Last updated: April 2026

Current boiler

New heating option

Energy rates

Payback headline

7.1 years

Annual saving

£352/year

20-year saving

£4,543

Moderate payback; worth comparing quotes and repair costs.

Cost comparison

Current heating
£1,200/year
New heating
£848/year
Annual saving
£352/year

Installation costs

Installation
£2,500
Government grant
-£0
Net cost
£2,500

20-year projection

Break even: year 8

When should I replace my boiler?

Most gas boilers last 10-15 years. If your boiler is over 10 years old, D-rated or below, or needs frequent repairs, replacement is often worth comparing against repair costs.

Is a heat pump worth it?

A heat pump can reduce carbon emissions and may reduce running costs in a well-insulated home. The economics depend heavily on electricity and gas prices, insulation, radiator size, and grant eligibility.

What is the Boiler Upgrade Scheme?

The Boiler Upgrade Scheme provides a grant toward an air source heat pump or ground source heat pump in England and Wales. The grant is paid through an MCS-certified installer.

What does this mean?

This calculator is designed to help you understand the likely number before you make a decision or start an application.

Your result should be checked against official UK guidance, especially if your circumstances include dependants, exemptions, prior leave, or a complex immigration history.

Treat the figure as a planning tool rather than legal advice. Where the answer affects an application deadline or major payment, speak to an authorised adviser.

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