Top 10 Boiler Installation Companies in London

Key Takeaways

• London has more than 12,000 Gas Safe registered engineers serving residential and commercial properties.
• The average boiler installation cost in London ranges from £2,500 to £3,500 for a standard combi boiler replacement.
• Worcester Bosch remains the most installed boiler brand across Greater London.
• With an efficiency of over 92%, contemporary A-rated condensing boilers can drastically lower the amount of energy used in homes.
• Pimlico Plumbers, Village Heating, and WPJ Heating rank among the best boiler installation companies in London for 2026.
• Many leading installers now offer 0% finance, extended warranties, smart thermostat integration, and same-day emergency services.
• London’s hard water conditions make boiler protection and annual servicing particularly important.
• Homeowners may qualify for heat pump grants and ECO4 funding through specialist providers such as Aura Retrofit.

Boiler Installation Market Statistics in London (2026)

 

Quick Comparison of the Best Boiler Installation Companies in London

 

Why Are More London Homeowners Replacing Their Boilers in 2026?

The demand for new boiler installations across London continues to rise as homeowners seek lower energy bills, improved heating performance, and greater reliability.

Many boilers currently operating across Greater London are over a decade old. While older systems may still function, they often run at significantly lower efficiency levels than modern condensing boilers. A boiler installed 15 years ago may operate below 70% efficiency, whereas a modern A-rated condensing boiler can exceed 92% efficiency.

This efficiency gap can have a noticeable impact on annual energy costs. With energy prices remaining a major concern for households, replacing an ageing boiler has become one of the most practical home improvements available.

Modern heating systems also provide:

• Faster hot water delivery
• Improved radiator performance
• Lower carbon emissions
• Reduced breakdown risk
• Better smart home integration
• Longer manufacturer warranties

For many London homeowners, replacing an old boiler is no longer simply about avoiding breakdowns. It is increasingly viewed as a long-term investment in efficiency, comfort, and property value.

How Much Does Boiler Installation Cost in London?

Boiler installation costs vary depending on the type of boiler, the complexity of the installation, and the condition of the existing heating system.

A straightforward combi-to-combi replacement is typically the most affordable option because pipework and controls can often remain in place. More extensive projects, such as converting a conventional system to a combi boiler, require additional labour and materials.

 

Several factors influence the final installation price:

Property Size

Larger homes generally require higher-output boilers and more extensive heating systems.

Number of Bathrooms

Properties with multiple bathrooms often require system boilers or unvented cylinders to meet simultaneous hot water demand.

Boiler Relocation

Moving a boiler to a new position can significantly increase labour costs because gas pipes, flues, and condensate routes must be altered.

Smart Heating Controls

Many homeowners now choose Hive, Nest, Tado, or Honeywell Evohome systems during installation to improve efficiency and convenience.

Which Boiler Brand Is Best for London Homes?

Choosing the right boiler brand is just as important as selecting the installer.

The UK market is dominated by a handful of manufacturers known for reliability, efficiency, and after-sales support.

 

Worcester Bosch

Worcester Bosch remains the most popular boiler brand in London. Its extensive installer network, excellent spare parts availability, and strong reliability record make it a favourite among both homeowners and heating engineers.

Vaillant

Vaillant boilers are renowned for their quiet operation and advanced German engineering. They are particularly popular in premium residential heating systems.

Viessmann

Viessmann offers some of the most efficient boilers available in the UK market and is often selected for high-performance installations.

Ideal

Ideal Boilers provide excellent value and continue to be one of Britain’s best-selling manufacturers.

Baxi

Baxi remains a trusted choice for homeowners seeking affordable installation costs and dependable performance.

Why Does Hard Water Matter When Choosing a Boiler in London?

Many homeowners overlook one of the biggest factors affecting boiler lifespan: water quality.

London’s water is sourced primarily from chalk aquifers, resulting in some of the hardest water conditions in the UK. Hard water contains high levels of calcium carbonate, which gradually forms limescale inside heating systems.

Over time, limescale can:

• Reduce boiler efficiency
• Restrict hot water flow
• Damage heat exchangers
• Increase energy consumption
• Shorten boiler lifespan

Water Hardness Across London

 

For many London properties, installers recommend:

• Magnetic filters
• Chemical inhibitors
• Water softeners
• Annual servicing
• System flushing

These measures can help protect expensive boiler components and maintain long-term efficiency.

Top 10 Boiler Installation Companies in London

1. Pimlico Plumbers – Best Overall Boiler Installation Company in London

Pimlico Plumbers is one of London’s most recognised home service providers and has been serving homeowners across the capital since 1979. What started as a local plumbing business has grown into one of London’s largest property maintenance companies, employing more than 200 engineers and trade specialists.

The company covers all areas within the M25 and has built a reputation for rapid response times, professional workmanship, and dependable customer service. Their Gas Safe registered engineers install, service, and repair boilers from leading manufacturers including Worcester Bosch, Vaillant, and Ideal.

One of Pimlico’s biggest advantages is its ability to provide same-day emergency boiler replacements when homeowners face unexpected heating breakdowns. With engineers available 24 hours a day, seven days a week, they remain one of the most accessible heating companies in London.

Unlike many boiler installation specialists, Pimlico Plumbers operates a complete multi-trade network. In addition to heating services, customers can access plumbing, drainage, roofing, air conditioning, electrical work, carpentry, pest control, and property maintenance through a single provider.

This makes Pimlico particularly attractive for homeowners managing renovation projects or properties requiring multiple trades.

Boiler Installation Services

• Combi boiler installations
• System boiler installations
• Conventional boiler replacements
• Boiler servicing and maintenance
• Boiler repairs
• Power flushing
• Smart thermostat installation
• Landlord gas safety certificates
• Central heating upgrades
• Emergency boiler replacement services

Areas Covered

Pimlico Plumbers serves all Greater London boroughs, including Westminster, Kensington and Chelsea, Camden, Islington, Southwark, Wandsworth, Lambeth, Tower Hamlets, Barnet, Croydon, Bromley, Ealing, Hillingdon, Richmond, Kingston, and all locations within the M25.

 

2. Village Heating (VHL) – Best For Landlords and Commercial Properties

Village Heating (VHL) is one of London’s largest independent heating and mechanical services companies. Established in 1992 and headquartered in Harrow, the business has grown into a multi-disciplinary contractor serving homeowners, landlords, housing associations, estate managers, and commercial property owners throughout Greater London and the Home Counties.

With a workforce of more than 150 staff, Village Heating offers far more than standard boiler installations. Their engineers specialise in heating, plumbing, electrical services, commercial maintenance, and property management support. This broad expertise makes them particularly attractive to landlords managing multiple properties and businesses requiring ongoing maintenance services.

The company is accredited by leading manufacturers including Worcester Bosch and Vaillant, enabling customers to access extended warranties and manufacturer-backed installation standards. Their engineers install combi, system, and conventional boilers while also providing servicing, repairs, power flushing, landlord gas safety certificates, and emergency heating support.

One of Village Heating’s biggest strengths is its ability to manage large-scale projects. Whether installing a single domestic boiler or maintaining heating systems across multiple residential blocks, the company has the resources and technical expertise to deliver reliable results.

Boiler Installation Services

• Combi boiler installations
• System boiler installations
• Conventional boiler replacements
• Boiler servicing and repairs
• Emergency boiler callouts
• Landlord gas safety certificates
• Power flushing
• Smart thermostat installation
• Unvented cylinder installations
• Commercial heating maintenance

Areas Covered

Village Heating serves: Harrow, Barnet, Brent, Ealing, Hillingdon, Hounslow, Richmond, Westminster, Kensington & Chelsea, Camden, Islington, Southwark, Wandsworth, All Greater London boroughs, Home Counties

3. WPJ Heating – Best Premium Boiler Installation Company in London

WPJ Heating is one of London’s most respected heating specialists and has built an outstanding reputation for delivering premium boiler installations and complex heating projects. Founded in 2002 and based in Battersea, the company serves homeowners across South and West London with a team of highly trained in-house engineers.

Unlike many competitors that rely on subcontractors, WPJ Heating uses only directly employed engineers. This approach allows the company to maintain strict quality control standards and deliver consistently high levels of workmanship.

The company is particularly well known for its Worcester Bosch Diamond Installer accreditation, which enables customers to access some of the longest manufacturer-backed warranties available in the UK. Their engineers install Worcester Bosch, Vaillant, and other leading boiler brands while also offering central heating upgrades, power flushing, and smart thermostat integration.

WPJ Heating is especially popular among owners of larger homes and luxury properties. Their expertise in advanced hydraulic heating design makes them one of London’s leading specialists for properties with multiple bathrooms, high water demand, rainfall showers, and sophisticated heating requirements.

Boiler Installation Services

• Combi boiler installations
• System boiler installations
• Conventional boiler replacements
• Boiler servicing and repairs
• Power flushing
• Smart thermostat installation
• Central heating upgrades
• Unvented cylinder installations
• Landlord gas safety certificates
• Emergency boiler repairs

Areas Covered

WPJ Heating covers: Battersea, Chelsea, Fulham, Kensington, Clapham, Wandsworth, Westminster, Richmond, Wimbledon, South London, West London, Greater London

 

4. South London Heating – Best Local Boiler Installation Specialist in London

South London Heating has established itself as one of the most trusted independent heating companies serving South London. Founded in 2007, the company has built a strong reputation for exceptional customer service, expert workmanship, and transparent pricing.

Serving homeowners throughout Bromley, Croydon, Beckenham, Dulwich, Sydenham, and surrounding areas, South London Heating is widely recognised for its customer-first approach. Unlike larger national companies, the business focuses on delivering personalised service and long-term customer relationships.

The company specialises in Worcester Bosch and Vaillant boiler installations, helping homeowners improve energy efficiency while benefiting from extended manufacturer warranties. Their engineers are Gas Safe registered and provide everything from simple combi boiler replacements to complete central heating system upgrades.

South London Heating has also earned recognition as a Which? Trusted Trader, an accreditation awarded only to businesses that consistently demonstrate high levels of customer satisfaction and professional standards

Boiler Installation Services

• Combi boiler installations
• System boiler installations
• Conventional boiler replacements
• Boiler servicing and maintenance
• Boiler repairs
• Power flushing
• Smart thermostat installation
• Central heating upgrades
• Landlord gas safety certificates
• Unvented cylinder installations

Areas Covered

South London Heating covers: Penge, Sydenham, Bromley, Croydon, Beckenham, Dulwich, Crystal Palace, Lewisham, Southwark, Greenwich, South London

5. Thames Boilers – Best Value Boiler Installation Company in London

Thames Boilers may be one of the youngest companies on this list, but it has quickly built an exceptional reputation among homeowners across South East London and Kent. Founded in 2017, the company has become known for combining competitive pricing with outstanding customer service and some of the highest customer review scores in the industry.

Unlike many traditional heating companies, Thames Boilers operates as a highly efficient, technology-driven business. Their streamlined approach focuses on making boiler replacement as simple and transparent as possible, helping customers understand costs, installation timelines, and warranty options from the start.

The company specialises in Worcester Bosch and Vaillant boiler installations and provides complete heating solutions including servicing, repairs, power flushing, and smart heating controls. Their engineers are Gas Safe registered and focus heavily on delivering reliable workmanship without the overheads often associated with larger national firms.

For homeowners looking for excellent value, transparent pricing, and a straightforward installation experience, Thames Boilers has become one of the strongest options available in London.

Boiler Installation Services

• Combi boiler installations
• System boiler installations
• Conventional boiler replacements
• Boiler servicing and maintenance
• Boiler repairs
• Power flushing
• Smart thermostat installation
• Central heating upgrades
• Landlord gas safety certificates
• Emergency heating support

Areas Covered

Thames Boilers covers: South East London, Bexley, Greenwich, Lewisham, Bromley, Dartford, Greenhithe, Gravesend, Sevenoaks, North Kent, Greater London

 

6. London Boiler Company – Best Worcester Bosch Boiler Installation Specialist in London

London Boiler Company is one of the capital’s leading boiler replacement specialists, focusing almost exclusively on domestic heating installations. Operating throughout South and West London, the company has earned a strong reputation for delivering high-quality Worcester Bosch installations backed by extended manufacturer warranties.

Unlike many general plumbing and heating contractors, London Boiler Company concentrates specifically on boiler replacements, heating upgrades, and energy-efficient heating solutions. This specialist approach allows the company to maintain exceptionally high installation standards while helping homeowners choose the most suitable boiler for their property and budget.

The company is operated by the same experienced team behind WPJ Heating and benefits from extensive industry expertise, manufacturer accreditations, and highly trained Gas Safe registered engineers. Their installations are particularly popular among homeowners seeking long-term reliability, premium workmanship, and extended warranty protection.

London Boiler Company works with leading boiler manufacturers but is especially recognised for its expertise with Worcester Bosch products. Customers can often access warranties of up to 12 years when installations are completed by accredited engineers.

Boiler Installation Services

• Combi boiler installations
• System boiler installations
• Conventional boiler replacements
• Boiler servicing and repairs
• Worcester Bosch installations
• Vaillant installations
• Smart thermostat installation
• Power flushing
• Central heating upgrades
• Unvented cylinder installations

Areas Covered

London Boiler Company covers: Battersea, Chelsea, Fulham, Clapham, Kensington, Westminster, Wandsworth, Richmond, Wimbledon, South London, West London, Greater London

7. Rowlen Boiler Services – Best Family-Run Boiler Installation Company in London

Rowlen Boiler Services is one of the longest-established heating companies operating in London and Surrey. As a family-run business with more than five decades of experience, the company has built an outstanding reputation for delivering reliable boiler installations, exceptional customer service, and long-term heating support.

Unlike larger national installers, Rowlen focuses heavily on personal service and customer relationships. Their engineers are Gas Safe registered and install a wide range of heating systems from leading manufacturers including Worcester Bosch, Vaillant, and Glow-worm.

The company serves both domestic and commercial customers and is particularly popular among homeowners looking for a trusted local installer rather than a large corporate provider. Their combination of experience, technical expertise, and customer care has helped them maintain a strong reputation throughout South London and Surrey.

For homeowners seeking a company with decades of proven experience and personalised support, Rowlen Boiler Services remains one of the strongest choices available.

Boiler Installation Services

• Combi boiler installations
• System boiler installations
• Conventional boiler replacements
• Boiler servicing and maintenance
• Boiler repairs
• Power flushing
• Smart thermostat installation
• Central heating upgrades
• Unvented cylinder installations
• Commercial heating services

Areas Covered

Rowlen Boiler Services covers: Sutton, Croydon, Wimbledon, Kingston, Epsom, Richmond, Merton, South London, Surrey, Greater London

 

8. Homecure Plumbers – Best For Emergency Boiler and Plumbing Services

Homecure Plumbers has become one of the most trusted heating and plumbing companies serving Greater London and the Home Counties. Founded in 2009, the company has built a strong reputation for delivering rapid emergency support, transparent pricing, and high-quality boiler installations.

Unlike many heating companies that focus solely on boiler work, Homecure combines heating, plumbing, drainage, and emergency property services under one organisation. This makes them particularly attractive to homeowners who want a single contractor capable of handling multiple household issues at the same time.

The company works with leading boiler manufacturers including Worcester Bosch and Vaillant, providing professional installations backed by manufacturer warranties and Gas Safe registered engineers. Their team also offers boiler servicing, repairs, power flushing, and central heating upgrades.

One of Homecure’s biggest advantages is its emergency response capability. The company operates a rapid-response network across London, helping homeowners deal with boiler breakdowns, leaks, and heating failures quickly and efficiently.

Boiler Installation Services

• Combi boiler installations
• System boiler installations
• Conventional boiler replacements
• Boiler servicing and maintenance
• Boiler repairs
• Emergency boiler repairs
• Power flushing
• Smart thermostat installation
• Central heating upgrades
• Landlord gas safety certificates

Areas Covered

Homecure Plumbers covers: Central London, North London, South London, East London, West London, Watford, Harrow, Barnet, Ealing, Hillingdon, Greater London, Home Counties

 

9. The Heating Engineers – Best For Bespoke Heating System Design

The Heating Engineers is a specialist heating company that focuses on designing and installing tailored heating solutions for homes across Greater London. Rather than simply replacing old boilers, the company takes a whole-system approach, ensuring that every component of the heating system works efficiently together.

Established in 2007, The Heating Engineers has developed a strong reputation for technical expertise, high-quality workmanship, and customer-focused service. Their engineers regularly work on complex heating projects, including boiler conversions, central heating redesigns, underfloor heating systems, and large residential properties with demanding hot water requirements.

The company works with leading manufacturers such as Worcester Bosch and provides professional installations backed by manufacturer warranties. Their attention to detail and consultative approach make them particularly attractive to homeowners planning renovations, extensions, or major heating upgrades.

For customers seeking more than a standard boiler swap, The Heating Engineers offers the expertise required to design efficient, future-proof heating systems.

Boiler Installation Services

• Combi boiler installations
• System boiler installations
• Conventional boiler replacements
• Boiler servicing and maintenance
• Boiler repairs
• Central heating system design
• Heating system conversions
• Smart thermostat installation
• Underfloor heating integration
• Unvented cylinder installations

Areas Covered

The Heating Engineers covers: Central London, North London, South London, East London, West London, Richmond, Wimbledon, Kingston, Harrow, Ealing, Greater London

 

10. Aura Retrofit – Best Eco-Friendly Boiler and Heat Pump Installation Company

Aura Retrofit is one of the most forward-thinking heating companies serving London homeowners today. Founded in 2005, the company has evolved from a traditional heating installer into a specialist provider of renewable energy systems, home decarbonisation projects, and government-funded energy efficiency upgrades.

While Aura continues to install and service modern gas boilers, its primary focus has shifted towards helping homeowners reduce energy consumption and future-proof their properties. The company specialises in air source heat pumps, solar PV systems, battery storage, insulation improvements, and low-carbon heating solutions.

Aura works extensively with government-backed funding schemes, helping eligible households access grants that can significantly reduce installation costs. For homeowners exploring alternatives to traditional gas boilers, Aura provides a level of expertise that many conventional heating companies cannot match.

Their team supports customers throughout the entire process, from grant applications and property assessments to installation and ongoing maintenance.

Boiler Installation Services

• Combi boiler installations
• System boiler installations
• Conventional boiler replacements
• Air source heat pump installations
• Boiler servicing and maintenance
• Smart thermostat installation
• Solar PV integration
• Battery storage systems
• Central heating upgrades
• Home energy efficiency improvements

Areas Covered

Aura Retrofit covers: South London, Croydon, Sutton, Bromley, Kingston, Surrey, Sussex, Hampshire, Greater London, South East England

 

Which Boiler Installation Company Is Best For Your Situation?

 

Worcester Bosch vs Vaillant: Which Is Better?

The majority of London homeowners choose either Worcester Bosch or Vaillant when installing a new boiler.

 

For most households, Worcester Bosch remains the safest all-round choice. However, Vaillant continues to be a favourite among premium installers because of its exceptional engineering quality and quiet operation.

Which Boiler Type Is Best For London Homes?

Combi Boilers

Best suited for:

• Flats
• Apartments
• 1–3 Bedroom Houses
• Homes with Limited Storage Space

System Boilers

Best suited for:

• 3–5 Bedroom Properties
• Homes with Multiple Bathrooms
• Families with High Hot Water Demand

Conventional Boilers

Best suited for:

• Older Period Properties
• Homes with Existing Tanks
• Low Water Pressure Systems

Choosing the correct boiler type is often more important than choosing the manufacturer.

How Much Could A New Boiler Save On Energy Bills?

Replacing an old G-rated boiler with a modern A-rated condensing model can significantly reduce heating costs.

 

Modern boilers also produce lower emissions and improve overall heating performance.

Can You Get Boiler Finance In London?

Many leading installers now offer finance packages designed to spread the cost of installation.

Common options include:

• 0% Interest Finance
• Buy Now, Pay Later
• Low-Interest Monthly Payments
• Terms Up To 10 Years

Companies including Pimlico Plumbers, WPJ Heating, Village Heating, South London Heating, and London Boiler Company all provide finance solutions.

Can You Get A Free Boiler Or Heat Pump?

Some London households may qualify for government-funded energy efficiency programmes.

Available schemes include:

• ECO4 Funding
• Warm Homes Local Grant
• Boiler Upgrade Scheme (BUS)
• Social Housing Decarbonisation Funding

The Boiler Upgrade Scheme currently offers grants of up to £7,500 towards eligible heat pump installations.

Aura Retrofit is one of the leading providers helping homeowners navigate these programmes.

Should You Repair Or Replace Your Boiler?

If your boiler is more than 10 years old, replacement may provide better long-term value than repeated repairs.

 

Major repairs on ageing boilers often exceed the value of the appliance itself.

How Long Does Boiler Installation Take?

 

A straightforward combi replacement can often be completed within a single working day.

How Did We Select The Best Boiler Installation Companies In London?

Our rankings are based on:

• Gas Safe Registration
• Customer Reviews
• Industry Accreditations
• Warranty Coverage
• Installation Pricing
• Finance Availability
• Years of Experience
• Emergency Support
• Service Coverage
• Specialist Expertise

The aim was to identify companies that consistently deliver quality installations, strong customer service, and long-term value.

Conclusion

Choosing the right boiler installation company can have a significant impact on your home’s comfort, efficiency, and running costs for years to come.

Pimlico Plumbers remains our top overall choice thanks to its extensive London coverage, emergency response capabilities, and multi-trade expertise. Village Heating and WPJ Heating are excellent options for larger or more complex projects, while South London Heating and Thames Boilers stand out for customer satisfaction and value.

Homeowners interested in renewable energy should also consider Aura Retrofit, which offers access to heat pumps, grants, and future-focused heating technologies.

Before making a final decision, obtain multiple quotations, compare warranties, verify Gas Safe registration, and consider ongoing servicing support.

FAQs

How much does a new boiler cost in London?

Most homeowners spend between £2,500 and £3,500 for a standard combi boiler installation.

Which boiler brand is most reliable?

Worcester Bosch and Vaillant are widely regarded as the most reliable boiler manufacturers in the UK.

Can a boiler be installed in one day?

Yes. Most like-for-like combi boiler replacements can be completed within 6–8 hours.

How often should a boiler be serviced?

A boiler should be serviced annually by a Gas Safe registered engineer.

Is boiler finance worth it?

0% finance can be a cost-effective way to spread payments without increasing overall costs.

Do new boilers save money?

Yes. Many homeowners save between £300 and £500 per year after replacing an older inefficient boiler.

What size boiler do I need for a 3-bedroom house?

Most 3-bedroom homes require a 28kW–32kW combi boiler.

Is Worcester Bosch better than Vaillant?

Both are excellent. Worcester Bosch generally offers stronger parts availability, while Vaillant is known for quiet operation.

Can I get a free boiler through ECO4?

Eligible households may qualify for funded energy efficiency improvements through ECO4.

What is a Gas Safe registered engineer?

A Gas Safe registered engineer is legally qualified to install, service, and repair gas appliances in the UK.