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Boilers in Cardiff

£1,480 to £5,040 installed, and 42% of homes in the council area rated EPC D to G.

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By Home Energy Quotes · Updated September 2026 · Cardiff, South Glamorgan

Boilers in Cardiff

What a new boiler costs in Cardiff

24–30kW combi

£1,480–£2,170

Saves up to £150 a year. Pays back in about 12 years.

35–40kW system (most common)

£2,290–£2,960

Saves up to £222 a year. Pays back in about 12 years.

40kW+ heat-only

£3,270–£5,040

Saves up to £293 a year. Pays back in about 14 years.

Source: Home Energy Quotes Cost Index, costs modelled March 2026, savings at the October to December 2026 price cap. Prices are estimates and include installation and VAT. Actual costs may vary.

Cardiff in numbers

Published statistics for the Cardiff council area, not our estimates.

At the 2021 Census, 78.4% of households in the Cardiff council area used mains gas as their only central heating, 0.1% oil only and 10.4% electricity only. 42% of homes with an EPC in the Cardiff council area are rated D to G, and the median energy score is 70, which is band C.

Cardiff council areaFigureSource
Households on mains gas heating only78.4%Census 2021, ONS
Households on oil heating only0.1%Census 2021, ONS
Households on electric heating only10.4%Census 2021, ONS
Homes with an EPC rated D to G42%ONS, EPCs lodged to March 2025
Median EPC energy score70 (band C)ONS, EPCs lodged to March 2025
Electricity network operatorNational Grid Electricity Distribution (South Wales)NESO licence area boundaries

These are published official statistics for the Cardiff council area, which covers Cardiff, not Home Energy Quotes estimates. Sources checked 6 October 2026.

Grants and funding in Cardiff

No general boiler grant

There is no general grant for a like-for-like boiler replacement in Cardiff. If your home has no working heating and you receive a means-tested benefit or live in a low-income household, Nest may repair or replace the boiler. Switching to a heat pump can qualify for the Boiler Upgrade Scheme, worth up to £7,500.

Source: Welsh Government — Nest

Standard VAT

Boilers are not on HMRC's list of energy-saving materials, so 20% VAT applies and is inside the prices above.

Source: HMRC — VAT Notice 708/6

Is Cardiff a good place for boilers?

The area’s housing stock includes a range of properties suited to boilers installations throughout Cardiff. Combined with Wales’s energy prices, boilers installations here may offer good value (individual results will vary).

Cardiff has a population of 362,000, and the area falls within the Wales region. We recommend getting at least 3 quotes to compare prices.

Cardiff

Find Installers in Cardiff

We recommend getting at least 3 quotes from qualified installers before making a decision. Check reviews, ask for local references, and make sure warranties are clearly stated in writing.

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What to check before hiring an installer in Cardiff

  • Qualifications — check the installer holds relevant qualifications and certifications for boilers before signing any contract
  • Local references — ask for completed jobs in Cardiff or South Glamorgan
  • Reviews — check online reviews before committing
  • Warranty — product and workmanship warranties should be clearly stated in writing
  • 3 quotes minimum — we recommend comparing at least three quotes to ensure you get a fair price
Boilers installer in Cardiff

Questions about boilers in Cardiff

How much do boilers cost in Cardiff?
Boilers in Cardiff cost between £1,480 and £5,040 installed, depending on system size. A typical mid-range system costs around £2,630 including installation and VAT (modelled estimate).
How are homes in Cardiff heated?
At the 2021 Census, 78.4% of households in the Cardiff council area, which covers Cardiff, used mains gas as their only central heating, 0.1% oil only and 10.4% electricity only.
Is there a grant for boilers in Cardiff?
There is no general grant for a like-for-like boiler replacement in Cardiff. If your home has no working heating and you receive a means-tested benefit or live in a low-income household, Nest may repair or replace the boiler. Switching to a heat pump can qualify for the Boiler Upgrade Scheme, worth up to £7,500.
How long is the payback period in Cardiff?
The estimated payback period in Cardiff is typically around 13 years, based on estimated savings of up to £202 a year for a typical home. Actual payback depends on your property size, boiler efficiency and gas tariff.
Do I need planning permission in Cardiff?
Most boilers installations fall under permitted development rights and do not require planning permission. However, listed buildings, conservation areas and flats may need approval. Always check with your local planning authority in Cardiff before installation.
How do I find a good installer in Cardiff?
We recommend getting at least 3 quotes from qualified installers. Check online reviews and verify that the installer holds relevant qualifications before signing any contract.

Get quotes for your home in Cardiff

Up to three approved installers who cover Cardiff may contact you. Free, no obligation.

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Cardiff on the map

Map of Cardiff, South Glamorgan
Cardiff, South Glamorgan and the surrounding area.

Boilers in nearby towns

Last reviewed: . Costs are modelled estimates from the Home Energy Quotes Cost Index — see how we calculate them. Grant rates are checked against GOV.UK.