Boiler repair in Cardiff
Shared houses wear out diverter valves fast. Look up typical Cardiff repair costs, then book a Gas Safe registered engineer.
Common boiler repairs in Cardiff
Cardiff's terraces include plenty of shared houses and flats, and boilers that heat water for several people wear out diverter valves and pumps faster. Semis in the northern suburbs still run a fair number of older regular boilers with tanks in the loft. Apartment combis tend to lose pressure. With a boiler over 12 years old, you can ask for a replacement price alongside the repair quote.
Victorian bay-fronted terraces: Many terraces have been split into shared houses or flats, so boilers can be worked hard. Worn diverter valves and pressure loss are typical.
Interwar and post-war semis in the northern suburbs: Older regular boilers with loft tanks and cylinders are still around, so pumps, valves and thermostats are the usual failures.
Modern apartments around Cardiff Bay and the centre: Combis in apartments mostly fail on pressure, the diverter valve or the fan, and access can be tight in small cupboards.
Boiler repair prices in Cardiff
| Job | Typical price | Typical visit |
|---|---|---|
| Diagnostic visit | £80 to £120 | about 1 hour |
| Pump, valve or fan replacement | £150 to £350 | 1 to 3 hours |
| Main circuit board (PCB) | £250 to £450 | 2 to 3 hours |
| Annual boiler service | £80 to £120 | about 1 hour |
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 repair cost guide.
Boiler over 12 years old?
Repeat repairs on an old boiler add up. Compare a fixed replacement price in Cardiff before you pay for another part.
See boiler replacement optionsAreas we cover around Cardiff
- Roath
- Cathays
- Canton
- Pontcanna
- Grangetown
- Splott
- Llandaff
- Whitchurch
- Rhiwbina
- Penarth
Also nearby: Boiler repair in Swansea, Boiler repair in Bristol, Boiler repair in Gloucester
Boiler repair in Cardiff: questions
How much is a boiler repair in Cardiff?
Finding the fault on a first visit normally costs £80 to £120. Fitting a common part like a pump, valve or fan costs about £150 to £350, and a main circuit board £250 to £450. You agree the cost with the engineer before work begins.
I let a shared house in Cardiff and the boiler has failed. What should I do?
Book a Gas Safe registered engineer as soon as you can and tell tenants what to expect. If the repair will take days, portable electric heaters can bridge the gap. If the boiler is old and failing often, compare the repair price with a replacement.
Hot water runs cold but the heating works. What is the fault?
On a combi, that often points to the diverter valve, which switches the boiler between heating and hot water. It is a common part to replace. A blocked plate heat exchanger or a faulty flow sensor can cause the same symptom.
What should I do about a smell of gas in Cardiff?
Get out of the property, leave switches and flames alone, and call the National Gas Emergency Service on 0800 111 999, which covers Wales. Book the repair only after the emergency engineer has made it safe.