Important notice
This comparison uses data from the Energy Saving Trust, industry publications, and government sources. Actual costs and savings depend on your property, location, and usage patterns. We are not heating engineers — consult MCS-certified installers for advice specific to your home.
Head-to-head comparison
| Factor | Heat pump | Gas boiler |
|---|---|---|
| Upfront cost | £500–£7,500 After £7,500 BUS grant | £2,000–£4,000 No grant available |
| Efficiency | 300–400% COP 3–4 (manufacturer rated) | 90–95% Modern condensing boiler |
| Carbon emissions | Significantly lower Renewable energy source | Higher Fossil fuel combustion |
| Lifespan | 20–25 years According to manufacturers | 10–15 years Industry average |
| Maintenance | Annual service Fewer moving parts | Annual service Gas safety check required |
| Government grants | £7,500 BUS grant Plus ECO4 if eligible | None No government support |
| Future-proofing | Aligned with policy Government backing low-carbon heating | Phase-out planned New installations being restricted |
When each option makes sense
Heat pump fits
Choose a heat pump if…
- Your home is reasonably well insulated (or you can improve it)
- You qualify for the £7,500 BUS grant
- You're replacing an oil or LPG boiler (higher fuel savings)
- You want to reduce your carbon footprint
- You're planning to stay in the property long-term
Gas boiler fits
A gas boiler may suit if…
- Your home has very poor insulation that can't be easily improved
- You need a quick, low-cost replacement urgently
- You have limited outdoor space for an external unit
- Budget is the primary constraint and grants don't apply
- You're planning to sell soon (though higher EPC helps value)
Check Your Heat Pump Grant Eligibility
See if you qualify for the £7,500 Boiler Upgrade Scheme grant to make the switch affordable
Key eligibility factors:
- Replacing gas/oil/LPG boiler
- Property suitable for heat pump
- England or Wales
Check your property against the live MHCLG EPC register to see your current band and every grant you qualify for — free, in under a minute.
Check your propertyRelated guides
Policy
Gas boiler ban explained
The phase-out timeline and what it means for homeowners. Why the switch is coming.
Read guide →£7,500 grant
Boiler Upgrade Scheme
The government grant that makes switching from gas to a heat pump affordable.
Read guide →Insulation
Cavity wall insulation
Insulate first for the best results. Cavity wall insulation reduces heat loss and heat pump running costs.
Read guide →Ready to explore heat pumps?
Get no-obligation quotes from MCS-certified installers and find out what a heat pump would cost for your home.