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Independent · Figures calibrated to the Ofgem 1 Jul – 30 Sep 2026 cap and current Boiler Upgrade Scheme rules · Updated July 2026
Replacing a mains gas boiler with an air source heat pump in Cardiff costs about £5,000 for a typical 3-bed semi after the £7,500 grant — with a payback of roughly 9.7 years on a heat-pump tariff.
| Cardiff · Mains gas boiler home — key numbers (2026) | |
|---|---|
| Grant available | £7,500 |
| Scheme | Boiler Upgrade Scheme (England & Wales) |
| Typical install (3-bed semi, before grant) | £12,500 |
| Net cost after grant | £5,000 |
| Typical saving vs mains gas boiler (per year) | £514 |
| Payback (3-bed semi, heat-pump tariff) | 9.7 years |
| VAT on installation | 0% |
Heat pumps are an increasingly popular choice for Cardiff homeowners looking to upgrade their heating systems. Despite being a city, many residents still rely on mains gas boilers for warmth. However, with the introduction of the Boiler Upgrade Scheme (BUS) in England and Wales, including Cardiff, now is an option worth considering for these homeowners to consider making the switch to a high-efficiency air source heat pump.
As Cardiff is not a heavily off-gas-grid area, most homes are eligible for the standard BUS grant. This means you could receive up to £7,500 towards your installation costs when working with a MCS-certified installer.
Payback period — mains gas boiler home in Cardiff
—years
Install
After £7,500 grant
Saving / yr
They confirm your exact price and handle the grant paperwork — you never touch the money. No obligation.
Please enter a valid UK postcode and email, and tick the consent box.
Up to 2 MCS-certified installers covering Cardiff will be in touch within 48 hours with fixed quotes.
The timing of the BUS grant in Cardiff couldn't be better. Not only does it provide financial support through a substantial grant amount, but it also offers 0% VAT on installations and has no income test or EPC requirements to block eligibility. For those already using mains gas, upgrading now means taking advantage of this temporary £9,000 uplift, which runs until 31 March 2027.
By making the switch to a heat pump in Cardiff, you can enjoy lower running costs and CO2 emissions compared to traditional boilers, all while potentially saving thousands on your installation through the BUS grant. This opportunity to make your home more energy-efficient and comfortable for years to come.