Fully‑fitted combi, system and heat‑only boiler installations across Swansea from £2,190. Worcester Bosch accredited installers with 10‑year manufacturer warranties, free in‑home surveys, and fixed written quotes with everything itemised — including the parts most other quotes bury in the small print.
Boilers rarely fail suddenly. They give plenty of warning if you know what to look for. Every autumn we get calls from Swansea homeowners whose boilers have limped through another summer and are showing the classic pre‑failure signs — and every autumn a fair few of them wish they'd rung six months earlier.
The usual lifespan of a modern condensing combi is twelve to fifteen years. Older non‑condensing boilers from before 2005 are still out there — we service dozens of them across Uplands, Sketty and Morriston — but they're running at roughly 70% efficiency compared to a new A‑rated boiler's 93%, which means every £100 of gas is buying you £70 of heat instead of £93.
If any of these ring true, ring us. A free in‑home survey takes 30 minutes and tells you whether a repair is still economical or whether you're better off putting that £400 diverter valve toward a new boiler entirely.
Most Swansea homes end up with a combi boiler, and for good reason — one appliance handles heating and hot water, no separate cylinder taking up airing‑cupboard space, and hot water on demand rather than waiting for a tank to reheat. But it isn't the right choice for every household.
We'll advise honestly which suits your property during the survey — nobody benefits from a household of four sharing a 24kW combi that gasps whenever anyone turns on a tap.
An oversized boiler short‑cycles constantly, wearing out components years early. An undersized one struggles to keep the house warm on a cold February morning. Proper sizing is arithmetic, not a guess — but a surprising number of quotes still specify by "gut feel" or by matching whatever's on the wall already.
We size boilers using the same method the manufacturer engineers use — calculating your property's peak heat demand from the room dimensions, insulation, window ratios and heat‑loss coefficients, then adding a modest allowance for hot water demand. It takes about 20 minutes on a site survey and it's why our installs run efficiently for the whole of their life rather than the first three winters.
| Property size | Typical combi kW | Hot water flow (l/min) | Suits |
|---|---|---|---|
| 1–2 bed flat, 1 bath | 24 kW | 10 l/min | SA1 harbourside, Uplands terraces |
| 2–3 bed terrace, 1 bath | 28–30 kW | 12 l/min | Brynmill, Sandfields, Sketty |
| 3–4 bed semi, 1–2 bath | 32–35 kW | 14 l/min | Mumbles, Killay, Morriston semis |
| 4+ bed detached, 2+ bath | System 32 kW + cylinder | N/A · unvented | West Cross, Newton, Gorseinon |
| Large period property, 3+ bath | System 40 kW + 250L cylinder | N/A · unvented | Mumbles seafront, Bishopston |
You'll sometimes see quotes recommending a 40kW combi for a modest three‑bed house. That's usually because the salesperson wants a bigger commission on a bigger boiler. Beyond 32kW you gain almost nothing except more standing pilot losses and shorter component life. If a quote wants to fit you a 40kW boiler in a two‑bath home, ask them to justify it — a good installer will explain why (rare) or admit it's marketing (common).
We're accredited to install every major UK boiler brand. In practice we recommend from five ranges, because those are the ones we know we can stand behind for the full length of the warranty — including finding parts quickly when something goes wrong in year seven.
The default recommendation for most Swansea homes. Well‑made, quiet, 10‑year manufacturer warranty when we fit them, and parts availability that outlasts the warranty itself. From £2,190 fully fitted.
German build, exceptionally quiet operation, excellent modulation range so it doesn't short‑cycle in shoulder seasons. 10‑year warranty on the exclusive. Slightly premium — from £2,690 fitted.
British‑built (Hull), the smart‑money choice for tighter budgets. Vogue Max carries a 10‑year warranty and matches the Worcester on flow rate and efficiency. From £1,990 fully fitted for the Logic Max C24.
Stainless steel heat exchanger (most brands use aluminium), so it shrugs off the mineral‑hard water we get in parts of Swansea. Premium price, premium reliability. From £2,890 fitted.
Solid, straightforward, unglamorous — the "just works" choice. Good for landlord installations where we prioritise parts availability and low replacement cost. From £1,890 fitted.
We don't fit boilers we can't get parts for quickly, and we don't fit budget brands with a track record of PCB failures at year four. Ask us which ones — we'll say honestly, we just won't put it in print.
Most straight combi‑for‑combi swaps take one working day. A conversion from an old regular boiler to a modern combi, or a system boiler with a new unvented cylinder, typically takes two. You'll have heating and hot water back on by the end of that day.
Van parked, dust sheets down, floor protectors along the route to the boiler cupboard. Gas, water and electric isolated at the boiler and safely capped. Existing boiler and pipework drained.
Full magnetite flush of the entire heating system using an industrial magnetic filter and Sentinel X400 chemical. Every radiator individually flushed. Water runs clear before we call it done.
Old boiler comes off the wall, disconnected properly, taken away for scrap. Any redundant pipework is capped or removed. We photograph the empty wall so you can see what's underneath.
New boiler bracketed to the wall, pipework reworked in copper, gas run upgraded if needed for the new kW rating, condensate drain routed away from freezing risk (a common Swansea winter failure point).
Fernox TF1 magnetic filter fitted to the return, flue routed and sealed, smart thermostat wired in and paired to your phone. All new isolation valves and drain‑off points fitted.
System filled and pressurised. Boiler fired, flue gas analyser reading recorded and photographed. System balanced radiator‑by‑radiator so every room reaches temperature together. Handover and warranty paperwork.
Every install ends with the floor hoovered, tools and packaging removed, and the boiler cupboard left cleaner than when we arrived. Boxes and old boiler go on the van — you don't have to arrange skip hire or a council collection.
A boiler warranty is only as good as the installer's ability to prove the install was done properly. We keep the paperwork ourselves as well as handing you copies, so if you ever need to make a warranty claim in year eight we can back it up.
Every new boiler we install comes with three layers of cover:
Worcester Greenstar boilers we fit come with a 10‑year parts and labour warranty from Worcester Bosch. Vaillant ecoTEC exclusive is 10 years, Ideal Vogue Max is 10 years, Viessmann Vitodens 100‑W is 10 years, Baxi Assure is 10 years, Ideal Logic Max is 7 years. All of these require an annual service by a Gas Safe engineer to remain valid — we'll offer a reminder each year, ours or not.
On top of the manufacturer's cover, we add a 12‑month labour warranty. If any workmanship issue develops in the first year — a leaking joint, a loose electrical connection, a flue re‑seal — we come back and fix it at no cost. In practice we've been called back to about 2% of installs, always for minor things.
Every gas boiler install is legally required to be notified to Building Control via the Gas Safe Register within 30 days. We do this for you and email you the notification certificate. Solicitors will ask for this document when you sell the property, so keep it filed.
Ring us first, not the manufacturer. We have direct trade lines into Worcester, Vaillant and the others — a claim we escalate is usually resolved within 48 hours, whereas an owner going in cold via a call centre can wait a week or more. It's free service that comes with the install.
The final cost depends on which boiler, which house and how much of the existing plumbing survives the survey. Here's a realistic guide to what Swansea homeowners actually pay, plus how to spread it.
| Job | Typical Swansea home | All‑in price |
|---|---|---|
| Straight combi swap · same location | 2‑bed terrace, Sandfields | £2,190 |
| Combi swap + power flush + smart stat | 3‑bed semi, Sketty | £2,490 |
| Combi upgrade + move to new location | 3‑bed terrace, Uplands | £2,890 |
| Regular to combi conversion | 3‑bed semi, Morriston | £3,290 |
| System boiler + 200L unvented cylinder | 4‑bed detached, Killay | £4,690 |
| Full system rebuild + rads & controls | 5‑bed period, Mumbles | £6,890+ |
These prices assume standard access, standard gas supply and no unusual asbestos removal or listed‑building constraints. The written quote we hand you after the survey will be the actual number, not a range.
Finance is arranged through our long‑standing partner Ideal4Finance (FCA‑regulated). We don't earn commission on the finance itself — the option exists because it makes sense for some households, not because it's a profit centre.
MON–FRI · 07:00–20:00
SAT · 08:00–17:00
SUN · 09:00–14:00 (emergencies)
EMAIL · hello@boilerserviceswansea.co.uk