Boiler Central supplies and fits mains-gas boilers across Greater London at a fixed online price. Gas boilers start from £1,790 fitted; prices vary by model and home. Answer a few questions online to see your price, then upload photos after you order.
Fixed boiler installation prices in London
Gas boilers start from £1,790 fitted; prices vary by model and home. The examples below are from a like-for-like combi quote checked on 6 November 2026 for one home in West Yorkshire. Your fixed price depends on your home and postcode.
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| Example like-for-like combi quote (one West Yorkshire home, 6 Nov 2026) | Type | Fitted price |
|---|---|---|
| Viessmann Vitodens 025 28kW | Combi | £1,928.99 |
| Alpha E-Tec NX 28kW | Combi | £2,015 |
| Worcester Greenstar 4000 25kW | Combi | £2,474.96 |
We fit Worcester Bosch, Viessmann, Alpha and Ideal. Other brands may appear in your quote depending on your home; your quote shows which models are available.
See prices for my London postcode
What’s included
As standard, fixed installed prices typically cover:
- New gas boiler, Gas Safe fitting
- Removal of your old boiler
- Chemical flush, inhibitor and magnetic filter
- Wireless thermostat
- Commissioning and manufacturer guarantee registration — your quote shows the guarantee for each boiler
Relocation, type conversion, plume kits and other extras appear on your quote before you pay. Your quote shows what is included and any extra costs.
Boiler replacement in London flats
Most flat boilers are combis in a kitchen cupboard, and a like-for-like swap is usually the simplest job. Check before you book:
- Your lease — many leases need freeholder or managing-agent consent, especially if the flue position changes
- Flue position — clearance from windows, doors and vents matters; blocks may have their own outside-wall rules — upload a photo of where the flue exits
- Shared flues — some older blocks use shared flue systems that need a compatible boiler — mention this in the quote questions and include a photo
Terraces, conversions and combis
Victorian and Edwardian terraces often still have a regular boiler and loft tanks. With about one bathroom, a combi conversion frees cupboard and loft space; conversions commonly take around two days. With two bathrooms, a system boiler with a cylinder may suit better — see combi boilers and system boilers.
Popular compact models from the brands we fit include:
Comparing Vaillant or Baxi? Our reviews can help. The online quote shows which boilers are available for your home.
Parking, permits and the Congestion Charge
Engineers arrive with tools and the new boiler, so access matters in London. Parking and the Congestion Charge are included in your fixed Boiler Central price, so there are no surprise day-rate charges on the van for those. Tell us about controlled parking or a residents’ bay when you book so the engineer knows where to stop.
How buying online works in London
- Answer questions about your home and boiler in the online quote.
- Compare fitted prices.
- Choose your boiler and date, and complete your order.
- Upload photos of your boiler and pipework.
- A Gas Safe registered engineer fits your boiler on the booked date.
More on the process: buy a boiler online.
Next-day boiler installation in London
For eligible like-for-like swaps, next-day fitting may be available if you order by 3pm, depending on stock, appointments and your postcode. Conversions usually take about two days; other installations depend on the work needed. Check your quote for available dates. See next-day boiler installation.
Areas we cover in Greater London
We fit boilers across Greater London, including the E, EC, N, NW, SE, SW, W and WC postcode areas, plus outer districts in BR, CR, DA, EN, HA, IG, KT, RM, SM, TW and UB. Every borough is covered. Coverage is England, Scotland and Wales — not Northern Ireland. Enter your postcode in the quote to confirm.
For the UK-wide process, including timings and what’s included, see new boiler installation.
Sister city page: boiler installation Leeds.
Customer reviews
A good company, most probably offering the best available package to buy and have a boiler installed (in my case, a replacement boiler).
Clear information on a number of alternative boiler options and finance. The process from start to finish is well documented and followed by the company. I had no problem to provide the required pictures showing the existing situation in my flat and the building in advance of the gas engineer's visit. The boiler was delivered promptly to my 2nd floor flat (stairs) on the day before the arrival of the installer as promised.
One thing though to check beforehand and avoid any last minute surprises is the following. If you have a similar 2nd floor flat, in case the boiler you would have chosen requires a horizontal flu to be fitted from the outside of the building, access by triple ladder would be necessary and included in the price of the package but this may be limited depending on the actual height of the flu from the ground.
However, I was told that, if the external wall of your building has no cavity between the external and the internal bricks, then the flue pipe can be fitted from the inside of the building without the need of a ladder. This is something to remember in case your flat's flu is beyond the reach of a triple ladder.
The gas engineer that installed my boiler was very polite, extremely knowledgeable and very well trained in this brand of boiler (Viessmann) and cleaned the area where he worked before he left. Perhaps the best gas engineer I have come across so far and I have seen a few of them..
As for value for money, if you add to the price of the boiler the rest (installation by a Viessmann trained engineer, the flu pipe, 12 years of warranty, the magnetic filter, the thermostat, the recycling of the old boiler etc) and having someone else to arrange all this and deliver it to you, the answer would be obvious!
— Kostantinos, London
The sales person I spoke to was very knowledgeable about boilers, and took a long time to explain in detail why he was recommending a particular boiler to me, based on my particular circumstances. The price was much better than other quotes I had received, and the install was scheduled very quickly. The tradespeople who installed the boiler were very efficient and friendly.
— Ella, London
We had some challenges getting to the installation date, but once on site the 2 engineers couldn't have been more diligent and incredibly helpful when they discovered quickly I had gas leaks I was unaware of. The job took much longer than scheduled but no corners were cut and they talked me through the new boiler operation very clearly. Thank you
— Victoria, London
Very efficient service from ordering to installation. We were kept informed when engineer was arriving. The boiler was installed with minimum of disruption and engineer very helpful. There ws also follow up by firm to check everything was satisfactory. A fantastic service would recommend.
— Shan, London
Easy to setup the boiler purchase and was kept informed of the progress at all times. Installation staff were very professional and explained the installation process and how to operate the new system. Good price and good company to work with. Would definitely recommend
— Antony, London
London boiler installation FAQs
How much is boiler installation in London?
With Boiler Central, mains-gas boilers are supplied and fitted across Greater London at a fixed online price. Gas boilers start from £1,790 fitted; prices vary by model and home. For example, a like-for-like combi quote checked on 6 November 2026 for one home in West Yorkshire showed the Viessmann Vitodens 025 28kW at £1,928.99 and the Worcester Greenstar 4000 25kW at £2,474.96. This is an example, not a London price list; your fixed price depends on your home and postcode.
Can you replace a boiler in a London leasehold flat?
Yes — most London flat jobs are like-for-like combi swaps in a kitchen cupboard. Check your lease first: many freeholders or managing agents require consent, especially if the flue position changes. Shared flue systems in older blocks need a compatible boiler — tell us in the quote questions and upload a photo of where the flue exits.
Who pays for parking and the Congestion Charge?
Boiler Central does — parking and the Congestion Charge are included in your fixed price. Tell us about controlled parking or a residents’ bay when you book so the engineer knows where to stop.
What guarantee do I get?
Guarantees vary by model. Your quote shows the guarantee for each boiler. We register the manufacturer guarantee as part of the install package; keep up with annual Gas Safe servicing to maintain cover.
Can I swap tanks for a combi in a London terrace?
Often, yes, if your home and water pressure are suitable. Conversions usually take about two days. If you have more than one bathroom, a system boiler may be a better fit. Check your quote for suitable options.
Do you cover outer London?
We cover the London postcode areas and outer districts listed above. Enter your postcode in the quote to check whether we cover your area.
Which brands do you fit?
We fit Worcester Bosch, Viessmann, Alpha and Ideal mains-gas boilers. Your quote shows which models are available for your home.
Get your fixed price
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