NEW BOILERS · FIXED QUOTES · UP TO 10-YEAR WARRANTY

Boiler Installation in London, Supplied, Fitted, Guaranteed

A-rated combi, system and conventional boilers from the leading manufacturers, supplied and fitted by Gas Safe engineers across all 32 boroughs, often within 24 hours of your survey. Fixed prices, no pressure, old boiler taken away.

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Straight talk

"When repair stops being the honest advice."

There comes a point in every boiler's life when the honest advice stops being "repair it" and becomes "replace it", and if you've landed on this page, you're probably somewhere near that point. Our Gas Safe registered engineers carry out boiler installations across all 32 London boroughs: A-rated combi, system and conventional boilers from the leading manufacturers, supplied and fitted with warranties of up to ten years, often within 24 hours of your survey. Fixed quotes, no pressure, and the old boiler taken away and disposed of properly. This page covers everything you'd want to know before spending a penny, what a new boiler installation costs in London, which type suits your home, how the process works, and when replacement genuinely beats another repair.

Do you actually need a new boiler? An honest starting point

Plenty of firms will sell you a boiler you don't need, so let's start with when you don't. If your boiler is under ten years old and the fault is a component, a sensor, a valve, an electrode, repair wins almost every time. We say this as a company that fits boilers for a living.

Replacement starts to make sense when the signals stack up. Age is the first: past twelve years, efficiency has usually slipped well below what the boiler achieved on day one, and parts become the second problem, some are discontinued, others only available reconditioned. Repair frequency is the next signal: if you've had an engineer out twice in eighteen months, you're paying a new boiler's deposit in instalments without getting the boiler. Rising gas bills tell their own story, because a tired boiler quietly burns more to deliver less, a modern A-rated condensing boiler converts over 90% of its fuel into heat, where an old G-rated unit manages 70% or less, and on a typical London gas bill that gap is worth hundreds of pounds a year. And then there are the deal-breakers: a cracked heat exchanger, a failed PCB on a fifteen-year-old unit, or any fault costing more than half the price of a new boiler on a boiler past twelve years old. That last one is the rule of thumb our engineers use on site, and we'll show you the numbers rather than just declaring the verdict.

Not sure which side of the line you're on? Thirty seconds of honesty:

REPAIR

Still economical. But start budgeting: boilers this age average one repair a year from here.

Fixed quotesUp to 10-year warrantiesGas Safe installersOld boiler removed
Types compared

Combi, system or conventional, which boiler suits a London home?

The right boiler type has less to do with brands and more to do with your property and how it uses hot water.

Most popular in London
Combi
Combi boiler
Best for: Flats & 1-bathroom homes

A combi boiler installation is the answer for most London flats and small-to-medium houses. Combis heat water on demand straight from the mains, no tank, no cylinder, no waiting, which frees the airing cupboard and suits the space-starved reality of a Zone 2 conversion. The trade-off is flow rate: one powerful shower, yes; two showers and a kitchen tap running simultaneously, no. For the one-bathroom households that make up most of the capital, a combi is the default for good reason.

Hot water
On demand
Space needed
None
Typical installed cost
£1,800–£2,800
System
System boiler
Best for: 2+ bathrooms

A system boiler suits larger homes with two or more bathrooms. It works with a hot water cylinder, so multiple outlets can run at once without the flow collapsing, the right call for the extended Victorian terraces of south and north London where a loft conversion added a second en-suite. Modern unvented cylinders deliver mains-pressure hot water, which is a revelation for anyone used to a gravity-fed dribble.

Hot water
Stored at mains pressure
Space needed
Cylinder
Typical installed cost
£2,200–£3,200
Conventional
Conventional boiler
Best for: Like-for-like in older homes

A conventional (heat-only) boiler is the traditional setup with a cylinder and tanks in the loft. We mostly fit these as like-for-like replacements in older properties where converting the whole system isn't worth the disruption, and sometimes keeping the layout genuinely is the sensible, cheaper choice. An engineer who recommends the £2,000 option over the £3,500 one when it's right for the house is an engineer you can trust with the rest.

Hot water
Stored, gravity or pumped
Space needed
Cylinder + loft tanks
Typical installed cost
Quote on survey

During your survey we'll also size the boiler properly, output in kilowatts matched to your radiators, bathrooms and mains pressure. An oversized boiler short-cycles and wastes gas; an undersized one leaves the back bedroom cold. Sizing is where experienced installation earns its money.

Boiler picker

Which boiler suits my home?

Three quick questions, no email, no signup.

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How many bathrooms?
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Transparent pricing

What does a new boiler cost in London?

Straight numbers, because this is the question you came with.

Installation type
Typical range
Combi like-for-like
£1,800–£2,800
System boiler
£2,200–£3,200
System + cylinder
£3,000–£4,500
Conventional-to-combi conversion
£2,800–£4,000+
Fixed quote before work · No deposit until you say yes
Get a free quote
Every quote includes
Boiler Magnetic filter Chemical flush Boiler Plus controls Flue Labour Old boiler removal

The price we quote after survey is fixed; the price you pay is the price we quoted.

The cheapest quote trap

The cheapest quote in London is rarely the cheapest boiler over ten years, a £1,600 install with no flush and no filter is how a new boiler inherits an old system's sludge.

Warranty maths

Warranty length is tied to accredited installation and annual servicing: fit the right boiler correctly and service it yearly, and the leading manufacturers back it for seven to ten years, sometimes twelve. That warranty is worth more than any discount.

Brand register

The brands we install, and why we'll tell you which one fits

How it works

How your installation works, survey to handover

  1. 01

    Survey

    A Gas Safe engineer visits (or video-surveys for straightforward like-for-like swaps), checks the existing system, flue route, gas supply and mains pressure, and talks through how your household actually uses heat and hot water.

  2. 02

    Fixed quote

    Itemised, valid for 30 days, no follow-up phone campaign.

  3. 03

    Installation day

    Most like-for-like swaps are done in a day; conversions take one to two. Floors protected, system flushed, filter fitted, controls set up, everything pressure-tested and commissioned.

  4. 04

    Handover

    We register the boiler with the manufacturer for the full warranty, notify Building Control through the Gas Safe registration process, walk you through the controls, and leave the paperwork in your hand, not in the post.

    • Building Regulations certificate
    • Benchmark record
    • Manufacturer warranty registration
Recent work

Recent installations across London

JOB/E17/CONVERSION

"A conventional-to-combi conversion in a Walthamstow terrace, E17: airing cupboard reclaimed, gas bills down noticeably by the second month."

JOB/W11/VITODENS

"A Vitodens 100-W into a Notting Hill basement flat, W11, threading a new flue through a listed-building constraint that had defeated two previous quotes."

JOB/CR0/LANDLORD ×3

"A landlord in Croydon, CR0, replacing three tired Baxis across a small portfolio in a single scheduled week, one contact, three certificates, zero tenant complaints."

Installation in London is rarely a textbook job; that's precisely why the surveyor and the fitter both need to know the city's housing stock.

New boiler installation in London, your questions answered

A like-for-like combi swap is usually one day. System changes or conversions run one to two days, confirmed at quote stage.

Ready for honest numbers?

Book a free survey and get a fixed, itemised quote for your new boiler installation, no deposit taken until you say yes, no pressure after the quote lands. Call 020 3000 0000 or request a callback, and if you're still weighing repair against replacement, say so: the engineer will price both, honestly.