New Boiler Installation & Replacement in London (Guide 2025)

Boiler installation in London often exceeds national averages, mainly due to the city's elevated cost of living and greater demand for heating services. This directly raises the price of installation, labour, and servicing, typically by 20-30%.

This is why choosing a new boiler in London requires careful consideration of both upfront costs and long-term running expenses. So, opting for a reputable installer and an efficient boiler in London offers some peace of mind against the city's higher operational costs. This guide walks you through the typical boiler prices and the most common installers operating in London. 

If you're caught up in London's hustle and bustle and don't have time to search for installers or contact them yourself, our service can relieve your stress. No need to spend hours googling, calling, and comparing prices – we can provide you with up to 3 boiler quotes within 48 hours. 

Simply click below, complete our form, and get your free, non-binding quotes.

Boiler installations in London typically cost around £3,700, representing a 37% premium compared to the UK average of £2,400–£3,800. The new boiler cost depends on the boiler type and brand, complexity and scope of the job, property type, and the type of installer. 

London's boiler installation prices also vary greatly depending on postcodes and boroughs. Boiler installation in Central London or its North parts is costly, but getting a boiler in South (East or West) London is the most expensive, up to 22% more compared to the national average.

Boiler installers in London typically charge £57 per hour and £295 for the whole day, compared to the national average, which ranges between £27–£61 hourly and £199–£264 per day, respectively.

It's highly recommended that you consult an experienced installer in your area before making any decision. They will advise on the best boilers for your London dwelling, especially in case of old pipework or low water pressure. This ensures your new system complies with all local regulations and safety standards while reducing your bills and saving you money.

Combi boilers are the UK's favourite, London included, due to their compact design and on-demand heating features. On average, a combi boiler installation in London costs £3,125–£3,900. 

Combi boilers are perfect for London's small apartments and Victorian conversions with limited spaces, as water tanks or cylinders aren't needed. However, even the best combi boilers depend on mains pressure, so they might struggle to service high-rise flats or older London boroughs like Hampstead.

Installing a system boiler in London will cost you around £2,600 and £3,700, depending on the necessary upgrades. Relocations in older homes or retrofitting complexities can add another £500–£1,000 to your total.

System boilers will suffice for medium (2-3 bed) and large (3+ bed) London homes. However, they might be challenging to install in Central London as they usually don't have airing cupboards, where the boiler cylinder is typically kept. 

In 2025, conventional boiler installations in London range from £2,600 to £3,700. Tank relocations or fuel conversions can escalate the cost further. 

Unlike combis, conventional boilers perform well in low–pressure areas and therefore do not depend on mains pressure. However, these boilers don't suit micro-flats or listed buildings due to the need to install loft tanks and cylinders.

Still not sure which boiler will suit your London home? Ask an installer! They can assess your home and heating needs and recommend a boiler option that will minimise your installation spendings and maximise your savings. 

GreenMatch can help you get up to 3 quotes from our network of vetted installers within 48 hours. Simply answer a couple of questions about your home and we'll do the rest. Compare the quotes without any obligations to accept any of them.

Click below to get your free, no-hassle quotes.

When selecting boiler installers in London, focus on the service area, response time, warranties, and customer satisfaction. 

Here's a recap of London's top installers:

This list can go on, as there are other companies servicing different London areas. Consider your priorities and request at least two or three Gas Safe registered installer quotes to compare prices and terms. British Gas, for example, works with its own Gas Safe registered installers and offers manufacturer-backed installations with strong aftercare.

It is important to note that actual boiler manufacturers have a network of accredited or approved installers and partner with various London heating companies. This ensures that the installation meets both manufacturer and safety standards. 

Companies like WPJ Heating or Maintracts are certified to install Worcester Bosch boilers, and offer extended manufacturer warranties of up to 12 years. Those London homeowners wanting to install Vaillant boilers should know that the company works through its Approved Installer scheme, partnering with selected London heating companies. 

So if you have a specific boiler brand in mind, don't hesitate to ask whether your contractor works with this particular manufacturer.

The premium of labour and servicing in London makes boiler reliability and warranty paramount to avoid frequent breakdowns and costly repairs. That's why it's important to choose from trusted and certified boiler engineers whose installations won't provoke any breaks or lead to any more expenses.

No matter if you're searching for boilers in Manchester, Birmingham or London, the process of acquiring quotes is usually the same across the UK:

Gathering all the needed information can take days, if not weeks. Yet with GreenMatch, you can save your precious free time and start at step 4. All you need to do is: 

Simply fill out our short form about your heating needs, and within 48 hours, we'll connect you with up to 3 local installers near you. Compare the quotes and decide whether they meet your budget and requirements. Our quotes are free and non-binding.

Click below to begin.