Is a heat pump always greener than gas?

Comparisons

Heat Pump vs Gas Boiler

This comparison helps homeowners understand where a heat pump may outperform a gas boiler, where it may not, and what building upgrades often influence the result.

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Page review status

Written by: HeatWise Home Editorial Team

Reviewed by: Editorial review by HeatWise Home

Review status: Internally reviewed for clarity, source consistency, and calculation assumptions.

Expert review: Not currently externally expert-reviewed.

Last updated: 2026-04-28

Last reviewed: 2026-04-28

Confidence: medium

Sources:

External expert review: HeatWise Home does not currently publish named external expert reviewers. We are working toward adding independent review from qualified retrofit, heating, or building-energy professionals. Until then, users should treat our calculators and guides as educational planning tools and confirm decisions with official sources and qualified installers.

Helpful next step

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Running cost comparison

Gas is usually cheaper per unit than electricity, so a heat pump needs good seasonal efficiency to compete on bills.

The stronger the SCOP and the lower the boiler efficiency, the more attractive the heat pump becomes.

Comfort and system design

Heat pumps tend to perform best with longer, steadier heating cycles rather than short bursts of high heat.

Radiator sizing, hot water setup, and weather compensation can have as much impact as the equipment brand.

Heat Pump Savings Calculator Insulation ROI Calculator Heat pump articles

Calculators on this site are estimates only. Always get a professional heat loss survey and verify current grant rules, tariffs, and product suitability before making purchase decisions.

Frequently asked questions

Often yes, but the exact carbon difference depends on local grid intensity and system performance.

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