Navien Boilers
Navien Boilers
Navien 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 Navien range and most older models — with a fixed written price before any work starts.
About this service
Navien Boilers in South West London, done properly the first time
Navien combis are known for high hot-water flow rates, which is useful in a Kingston upon Thames family home running a bath and a shower at once without moving to a cylinder. They also handle wide inlet pressure variation well.
Whether you need a straight Navien swap, a move from a regular boiler and cylinder to a Navien 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 Navien boilers the faults we are called to most are E003 — ignition failure; E016 — overheat; E515 — PCB fault; E110 — flue or fan fault. 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.
Family homes with high simultaneous hot-water demand that want to stay on a combi. If you are weighing Navien 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 navien boilers
Premium workmanship, fixed pricing and a service experience built around you.
Gas Safe registered engineers on every Navien job
Full current Navien 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 Navien 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, Navien warranty registered, controls explained and the site left clean.
Get a fast quote for navien 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 Navien boilers in Kingston upon Thames?
Yes. Our Gas Safe registered engineers install, service and repair Navien 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 Navien models do you work on?
We work across the current Navien range — including NCB700 ON, NCB300, NCB500, LCB700 oil — and we still service and repair older models where parts remain available.
How much does a Navien 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 Navien boiler?
Warranty length depends on the specific Navien 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 Navien boiler that has locked out?
Usually, yes. The faults we see most often on Navien are E003 — ignition failure; E016 — overheat; E515 — PCB fault. 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 Navien boiler work?
We cover the whole of South West London for Navien 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 navien boilers with a Gas Safe engineer — fixed pricing, open 24 hours.
Recommended Navien services in South West London
Gas Safe engineers installing, servicing and repairing Navien boilers across Kingston upon Thames, Richmond, Wimbledon, Twickenham, Surbiton and Fulham.
New Navien 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 Navien boiler typically costs to fit in a South West London home.
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Book navien boilers today
Free quotes, fixed pricing and Gas Safe engineers across Kingston upon Thames, Richmond, Wimbledon, Twickenham and the rest of South West London.