ATAG Boilers
ATAG Boilers
ATAG boiler installation, servicing and repairs in Kingston upon Thames and across South West London by Gas Safe registered engineers. We work on the full current ATAG range and most older models — with a fixed written price before any work starts.
About this service
ATAG Boilers in South West London, done properly the first time
ATAG builds at the premium end with stainless-steel heat exchangers, and the iC Economiser recovers heat from flue gases for genuinely lower running costs on high hot-water demand. Installer network is smaller, so it pays to use an engineer who works on them regularly.
Whether you need a straight ATAG swap, a move from a regular boiler and cylinder to a ATAG combi, or a diagnosis on a unit that keeps locking out, the work is carried out by our own Gas Safe engineers — never sub-contracted. We survey the property first, because the right answer in a three-storey Victorian terrace in New Kingston upon Thames is rarely the right answer in a two-bed flat in Putney.
On ATAG boilers the faults we are called to most are No-flame lockouts from ignition electrode wear; Low pressure from expansion vessel loss; Flue sensor faults; Condensate blockage in cold weather. Most are repairable in a single visit once diagnosed properly, and we will always tell you plainly when a repair is not worth the money against a replacement.
Long-term owners in larger homes with high hot water use. If you are weighing ATAG against another manufacturer, ask us — we install every major UK brand, so we have no reason to steer you anywhere except the boiler that suits your property, your hot water demand and your budget.
Why Maxfix
Why choose Maxfix for atag boilers
Premium workmanship, fixed pricing and a service experience built around you.
Gas Safe registered engineers on every ATAG job
Full current ATAG range installed, serviced and repaired
Fixed written price before work begins — no figures guessed on the phone
Same-week appointments across Kingston upon Thames and South West London
Manufacturer warranty registered on your behalf
12-month Maxfix workmanship guarantee on top
How it works
A calm, four-step process
From the first call to a tidy handover — no surprises, no jargon, no mess.
Tell us the model
Send the ATAG model name from the front panel, or a photo of it — that alone answers half the questions.
Survey or diagnosis
We check flue and condensate routes, gas pipe sizing, system pressure and hot water demand before advising.
Fixed written quote
You get a clear price in writing. Prices vary with model, access and system condition, so we never guess.
Install or repair, then commission
Work completed, ATAG warranty registered, controls explained and the site left clean.
Get a fast quote for atag boilers
Free, no-obligation quotes. Most calls answered within 30 seconds.
Trusted experts
Why choose Maxfix
Gas Safe Registered
Every engineer registered & ID-checked
Manufacturer Accredited [to be confirmed]
[accreditations to be confirmed]
Open 24 Hours, Every Day
Call any time — including nights and weekends
Fixed Price, Always
Agreed before we start — no hourly creep
Frequently asked
Your questions, answered
Do you install ATAG boilers in Kingston upon Thames?
Yes. Our Gas Safe registered engineers install, service and repair ATAG boilers across Kingston upon Thames (KT1, KT2 and TW9) and the neighbouring TW11, KT3 and SW19 postcodes, as well as Richmond, Wimbledon, Twickenham, Surbiton, Fulham, Putney, Teddington, New Malden, Molesey, Hounslow, Brentford, Isleworth, Long Ditton, Worcester Park, Roehampton, Raynes Park, Morden, Petersham, Motspur Park and the rest of South West London.
Which ATAG models do you work on?
We work across the current ATAG range — including iC Economiser, iC Combi, iS System, iR Regular — and we still service and repair older models where parts remain available.
How much does a ATAG boiler cost to install?
We do not publish prices for boiler work, because the honest figure depends on the model, the state of your existing system, flue and condensate routes, gas pipe sizing and access. Send us a few details or call and we will give you a fixed written price for your property before anything is booked.
What warranty comes with a new ATAG boiler?
Warranty length depends on the specific ATAG model, the installation and registering the boiler with the manufacturer, so we confirm the exact terms in writing with your quote rather than quoting a headline figure. Annual servicing is normally a condition of keeping any manufacturer warranty valid. Our own workmanship guarantee sits on top of it.
Can you repair a ATAG boiler that has locked out?
Usually, yes. The faults we see most often on ATAG are No-flame lockouts from ignition electrode wear; Low pressure from expansion vessel loss; Flue sensor faults. We diagnose first, tell you what the part and labour will be, and only then carry out the repair.
Which areas do you cover for ATAG boiler work?
We cover the whole of South West London for ATAG installation, servicing and repairs, including Kingston upon Thames, Richmond, Wimbledon, Twickenham, Surbiton, Fulham, Putney, Teddington, New Malden, Molesey, Hounslow, Brentford, Isleworth, Long Ditton, Worcester Park, Roehampton, Raynes Park, Morden, Petersham, Motspur Park and the surrounding KT, TW and SW postcodes.
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Ready when you are
Book atag boilers with a Gas Safe engineer — fixed pricing, open 24 hours.
Recommended ATAG services in South West London
Gas Safe engineers installing, servicing and repairing ATAG boilers across Kingston upon Thames, Richmond, Wimbledon, Twickenham, Surbiton and Fulham.
New ATAG boiler supplied and fitted with full manufacturer warranty registration.
Like-for-like swaps or full system upgrades, usually completed in a day.
Fault diagnosis and genuine parts for common fault codes and lockouts.
Annual service to keep your warranty valid and efficiency high.
Same-day call-outs when your boiler stops without warning.
24/7 no-heat and no-hot-water response across South West London.
Yearly safety and efficiency check with a full service report.
What a new ATAG boiler typically costs to fit in a South West London home.
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Book atag boilers today
Free quotes, fixed pricing and Gas Safe engineers across Kingston upon Thames, Richmond, Wimbledon, Twickenham and the rest of South West London.