Boiler replacement in Cardiff
Realistic costs first, then a fixed quote from a Gas Safe registered Cardiff installer. Most combi swaps take a single day.
The right boiler for a Cardiff home
Much of inner Cardiff is long streets of Victorian terraces with bay windows, while the northern suburbs are mostly semis built between the wars and after. Around the Bay and the centre there are newer apartment blocks. Terraces generally suit a compact combi in the back kitchen. Larger semis may need stored hot water. We help you match the boiler to the house before any fixed price is agreed.
Victorian bay-fronted terraces: The kitchen at the back of the house is the usual home for a combi. Many have a rear wing, so the flue can often go out of the side wall into the back yard.
Interwar and post-war semis in the northern suburbs: One bathroom points to a combi. With an en suite or a busy family, a system boiler and cylinder keeps hot water flowing at more than one tap.
Modern apartments around Cardiff Bay and the centre: A fair number of newer blocks use electric heating or a communal system instead of individual gas boilers. Where there is a combi, the building's flue arrangement limits the choice of model.
Boiler replacement prices in Cardiff
| Job | Typical price | Fitting time |
|---|---|---|
| Combi to combi swap | £2,200 to £3,400 | 1 day |
| System or regular to combi | £3,000 to £4,200 | 1 to 2 days |
| System boiler replacement | £2,800 to £4,000 | 1 to 2 days |
| Boiler and full system flush | add £300 to £500 | same day |
Typical prices including VAT, checked October 2026. Your installer gives you a fixed price in writing before any work starts. More detail in our boiler replacement cost guide.
Thinking about a heat pump instead?
With the £7,500 grant, a heat pump can cost less than you think in a well-insulated Cardiff home.
Is a heat pump right for you?Areas we cover around Cardiff
- Roath
- Cathays
- Canton
- Pontcanna
- Grangetown
- Splott
- Llandaff
- Whitchurch
- Rhiwbina
- Penarth
Also nearby: Boiler replacement in Swansea, Boiler replacement in Bristol, Boiler replacement in Gloucester
Boiler replacement in Cardiff: questions
What is the cost of a new boiler in Cardiff?
Most Cardiff combi replacements cost £2,200 to £3,400 fitted including VAT. Converting a regular or system boiler to a combi is more, typically £3,000 to £4,200, since the tanks and some pipework come out. You see the fixed figure in writing first.
My Cardiff terrace is rented as a shared house. Which boiler suits it?
With several people showering at different times, a combi with a higher hot water output often copes, but simultaneous use can be a struggle. If showers clash, a system boiler with a cylinder is steadier. Landlords also need a gas safety record every year.
How long is a Cardiff home without heating during the swap?
For a like-for-like combi swap, usually a single day, with heating and hot water back by the evening. Moving the boiler or removing tanks can stretch to two days. Your installer gives you the plan at the survey.
Are Cardiff installers Gas Safe registered?
Every installer we connect you with in Cardiff is Gas Safe registered, and we check before they quote. On the day, ask to see the engineer's Gas Safe ID card and check the number on the Gas Safe Register.