Average reply under 10 minutes. No obligation.
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.
If three or more apply, replace.
Fix it. A boiler this age with a quote this size is worth repairing.
Guide only. Based on a £2,200 reference for a new mid-range combi installed. An engineer's on-site view is always more accurate.
Combi boiler
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.
System boiler
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.
Conventional boiler
Three quick questions, no email, no signup.
How many bathrooms?
Do you have a hot water cylinder / tank in an airing cupboard?
How is your mains water pressure?
Fixed quote before work · No deposit until you say yes
The price we quote after survey is fixed; the price you pay is the price we quoted.
The same brands we repair, every day.
We install Vaillant, Worcester Bosch, Ideal, Baxi, Viessmann and Glow-worm, the same brands we repair every day across London, which gives us an unfair advantage as installers: we know exactly how each one ages, which models shrug off London’s hard water, and which quirks turn up at year eight. That knowledge goes into the recommendation. A Viessmann Vitodens with its stainless-steel heat exchanger earns its premium in hard-water postcodes; a Worcester Greenstar or Vaillant ecoTEC is the dependable default for most homes; an Ideal Logic keeps a rental portfolio compliant without over-spending. We’ll recommend one, explain why, and quote alternatives if you’d rather, the choice stays yours.
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.
Itemised, valid for 30 days, no follow-up phone campaign.
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.
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.
“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.”
“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.
Yes, where the survey is straightforward and stock allows, next-day installation is realistic across most of London. We prioritise no-heat households.
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.
