Radiator Repair & Installation in Cardiff
Cardiff's Welsh Water supply from Brecon Beacons reservoirs is soft — scale is a minor player, and the city's heating and hot-water work leans toward Victorian terrace pipework and the huge Cardiff Bay apartment stock. Inside radiators, system water chemistry decides everything: inhibitor keeps steel panels alive for decades, its absence dissolves them into the black sludge that blocks pipes and kills pumps. Every radiator job we do checks the water, not just the metal.
Repairs: cold spots, leaks and valves
Most radiator problems in Cardiff resolve in one visit: bleeding and re-pressurising for air-bound radiators, valve gland repairs for the classic slow drip, TRV head or pin replacements for radiators stuck cold or stuck hot, and tail re-seals where the connection weeps. Panels pinholed by internal corrosion are replaced rather than patched — a pinhole means the steel is finished, and the interesting question becomes whether the system water that caused it is treated or still eating the rest.
Replacement and upgrades
A straight swap onto existing pipe centres is the quick version — typically an hour or two per radiator including new valves. Changing size or style means adjusting pipework; moving a radiator means new routes. Modern double-panel convectors substantially out-perform old single panels of the same width, which is how cold rooms get fixed without bigger boilers. In Cardiff period homes, column radiators do the same job while suiting the room — at a price premium worth knowing before you fall for them.
Pricing
Typical fixed prices in Cardiff: valve repairs and TRV replacements from £95; a like-for-like radiator swap including new valves from around £150–£250 supplied and fitted depending on size; additions and relocations quoted after a quick survey because pipe routes drive the cost. Multiple radiators in one visit price keenly — the travel and setup are shared — so batch the whole house's grumbles into one appointment.
Coverage for radiator repair & installation runs right across Cardiff — Splott, Canton and Whitchurch included — plus the surrounding South Glamorgan area. Jobs route by proximity rather than by a call centre's guess at the map, which is why local engineers arrive with the right parts more often than not.
Frequently asked questions
Can you move a radiator to another wall?
Yes — it's routine, priced after a quick look at the pipe route. Under-floor access makes it cheap; solid floors or finished rooms make it dearer. The engineer will tell you honestly if the route makes it poor value.
Do I need to replace radiators when I get a new boiler?
Only if they're undersized, sludged beyond economic flushing, or corroded. Sound radiators serve a new boiler perfectly well once the system is cleansed and inhibited. Anyone insisting on wholesale replacement without a reason per radiator is selling, not surveying.
What are TRVs and are they worth it?
Thermostatic radiator valves let each radiator hold its own room temperature — cheap to fit, and they stop bedrooms overheating all evening. Current standards expect them on most radiators in new and replacement systems. Our TRV guide covers choosing and using them.
My radiator valve is leaking — is that urgent?
It's urgent-ish: a slow gland leak wets carpet and drops boiler pressure but rarely floods. Put a container under it, top up the boiler pressure if needed, and book promptly. A valve spraying rather than weeping is a call-now situation — isolate both radiator valves and phone.