Cardiff · CF10 · Wales
Price up a new boiler online, with the cost fixed from the start, and a Gas Safe registered engineer can fit it at your Cardiff home or flat – often next day. Replacement gas boilers in Cardiff cover combi swaps, system boilers, back boiler removals and complete heating upgrades.
Cardiff has Victorian terraces in Cathays and Roath, villas around Llandaff and Roath Park, and apartments in Cardiff Bay. We install Worcester Bosch, Vaillant, Ideal, Baxi and Viessmann boilers across the CF postcodes.
Cathays terraces are often student lets that need a boiler able to handle several showers, which can mean a Worcester Bosch or Viessmann system boiler. Family terraces in Roath are usually a combi swap to an Ideal Logic Max or Baxi 830. Bay apartments generally suit a compact combi matched to the existing flue position.
Boiler prices in Cardiff depend on the building. A flat in Cardiff Bay, a terrace in Cathays and a villa in Llandaff each need different boilers, and flue routes, pipework, cylinder choice and controls all move the final figure. Like-for-like combi swaps start from £1,759 fitted, while Worcester Bosch Greenstar 4000 packages start from around £2,450. Prices are fixed before anyone turns up. Parts and labour are already in the figure.
| Installation type | What’s involved | Price from | Time on site |
|---|---|---|---|
| Like-for-like combi swap | Replace an existing combi in the same position, with new flue, filter and controls | £1,759 | 1 day |
| Conventional or system to combi | Remove tanks and cylinder, cap off pipework, fit combi and upgrade gas supply if needed | £2,350 | 1–2 days |
| Back boiler replacement | Remove back boiler and fire, make good, fit new boiler in a new location | £2,795 | 2+ days |
| System boiler with cylinder | Suited to larger homes with multiple bathrooms; new or replacement unvented cylinder | £2,995 | 1–2 days |
| Boiler relocation | Move the boiler to a loft, garage or new room with new gas, flue and condensate runs | £2,250 | 1–2 days |
These are starting prices for a standard installation by a Gas Safe registered engineer; your online quote confirms the exact cost for your home.
Get a new boiler on finance in Cardiff from £23.26 a month. As an example, a £1,799 boiler spread over 10 years at 9.9% APR works out at £23.26 per month. Interest-free, shorter-term and buy now, pay later options are also on offer, subject to status. See our boiler finance options for the full details.
Cardiff’s housing mixes Victorian terraces, Edwardian villas and modern flats. These are the jobs we fit most.
A compact combi suits most terraces, tidying old pipework and freeing cupboard space once pressure is checked.
A system boiler and unvented cylinder keep hot water strong across several bathrooms.
A compact combi in a cupboard keeps the footprint small, with the flue exit and building rules checked first.
Local boiler installers
Cardiff is the capital of Wales, with long rows of Victorian terraces in Cathays, Roath and Canton, Edwardian villas around Roath Park and Llandaff, 1930s semis in Whitchurch and Llanishen, and post-war estates in Ely and Rumney. Cardiff Bay has been rebuilt with apartments, and the city is spread along the River Taff.
Terraces, villas and apartments each need a different boiler approach, and many homes sit in flood-aware areas near the river and bay. When we price replacement boilers in Cardiff we survey the building, check the flue route and look at hot water demand first, so your fixed price covers a boiler that suits it.
Pick your boiler and date online and a Gas Safe registered engineer arrives to remove the old unit, fit and commission the new one, register the warranty and notify Building Control, so the paperwork is done before they leave.
Cardiff has long Victorian terraces, Edwardian villas and new waterfront flats. Here is what we see most.
Cardiff’s water is generally soft, so scale is less of a problem than in the south-east. We check your postcode and still fit a magnetic filter to protect the system.
Long terraces often have original pipework and cramped boiler spots, and many are rented to students. We survey and fit a compact condensing boiler.
Larger Edwardian houses usually need a system boiler and cylinder, with discreet flue routes in the conservation areas.
Waterfront apartments may have specified boilers and lease rules. We check building requirements before we recommend a boiler.
Low-lying areas near the Taff, Ely and the bay can flood. We position boilers above ground level where possible.
Many Cardiff homes are rented. We supply the paperwork and commissioning certificates landlords need.
Our Gas Safe engineers cover the whole city, from the city centre and Cardiff Bay to Roath, Canton, Llandaff, Whitchurch and Penarth. See all our service areas.
Red pin: Cardiff town centre. Green pins: nearby towns we cover — tap a pin to see how far each town is from Cardiff. The shaded circle shows roughly 8 miles around Cardiff.
Other cities and towns we cover nearby include Bristol (about 26 miles) and Swansea (about 34 miles).
Often as soon as the next day, depending on the boiler you choose and engineer availability in the CF10 area. Complete the online quote, book a date that suits, and no heating or hot water means your booking is prioritised.
All CF10 postcodes across Cardiff, including Roath, Cathays, Canton, Llandaff and Whitchurch, plus nearby areas such as Penarth, Barry and Caerphilly. Our nationwide network of Gas Safe engineers extends our coverage to the wider area.
Cardiff’s water is generally soft, so scale is less of an issue and many homes need no scale reducer. You can check your postcode on your supplier’s hardness checker. Where levels are above 200ppm we fit one with a combi boiler, and we always protect the system with a filter.
Yes. The old back boiler and its fire come out, the flue and pipework are made safe, and the way is clear for a modern boiler. We install a modern, efficient combi or system boiler in a position that suits the house. It can take longer than swapping one boiler for another in the same place. The engineer confirms how long it’ll take before starting.
A boiler replacement is notifiable under Building Regulations in Wales, which your Gas Safe registered engineer handles, with a compliance certificate afterwards. Planning permission is not normally needed for a like-for-like swap, but in Llandaff, Pontcanna and Roath there are conservation areas, so check with Cardiff Council before moving a flue to a front-facing wall.
Yes. Boiler finance in Cardiff includes interest-free, 9.9% APR and buy now, pay later options, with deposits from £0 – see our boiler finance page. All finance is subject to status.
Yes. Your engineer safely disconnects, removes and disposes of the old boiler, plus any redundant tanks or cylinder if you’re moving to a combi.
All boilers we install come with a manufacturer-backed warranty, typically between 5 and 10+ years depending on the model. Keeping it valid usually means an annual service – our boiler cover plans take care of that for you.
Yes. Where mains gas isn’t available, we replace oil and LPG boilers. Each fuel has its own registered installer: OFTEC (oil) or Gas Safe with LPG competence (LPG). See our oil boiler installation and replacement and LPG boiler installation and replacement pages for more detail.
Tell us about your home, see fixed-price replacement boiler packages for Cardiff and book the installation date that suits you – all online, in a few minutes.