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Guide to New Boiler Installation in London: What You Need to Know

13 Nov 2025

How to look after your boiler this winter

A reliable and energy-efficient boiler is the heart of every London home. Whether you are upgrading an old system or replacing a faulty unit, investing in a new boiler installation can significantly improve your home comfort, efficiency, and energy savings.

At Speedy Jet Plumbers, we understand how important a dependable heating system is. With over 40 years of experience in plumbing and heating, our qualified Gas Safe engineers provide trusted boiler installation services throughout London. From choosing the right boiler to ensuring a safe, compliant installation, we make the process smooth, efficient, and worry-free.

If you are planning a new boiler installation in London, this guide covers everything you need to know—types of boilers, installation costs, choosing an installer, and safety regulations.

Understanding New Boiler Installation in London

Before starting your boiler upgrade, it’s important to understand what the process involves and how it benefits your home.

A new boiler installation is more than just fitting a new unit. It’s about improving heating efficiency, lowering energy bills, and ensuring consistent warmth in every room. Modern condensing boilers can achieve efficiencies of over 90%, reducing both carbon emissions and monthly costs.

At Speedy Jet Plumbers, our service includes initial assessment, boiler recommendation, professional fitting, and final safety checks to ensure your heating system performs at its best.

Learn more about our Boiler Installation Services.

Types of Boilers Available for London Homes

Choosing the right boiler for your property can impact performance, comfort, and energy efficiency. Here are the main types of boilers we install and maintain.

Combi Boilers

Combi boilers, or combination boilers, are a popular choice for London apartments and smaller homes. They heat water directly from the mains, eliminating the need for storage tanks or cylinders.

Benefits of a combi boiler include:

  • Instant hot water on demand
  • Compact and space-saving design
  • High efficiency and easy maintenance

However, they are best suited to homes with one bathroom, as water pressure can drop when multiple taps are used at once.

System Boilers

System boilers are ideal for larger homes that require a consistent supply of hot water for several bathrooms. They work with a separate hot water cylinder but do not require a cold-water tank.

Advantages include:

  • Delivers hot water to multiple outlets simultaneously
  • Compatible with solar water heating systems
  • Strong and reliable water pressure

System boilers are a great middle ground between combi and conventional systems, providing efficiency without sacrificing performance.

Conventional Boilers

Conventional, or regular boilers, are often found in older homes. They require both a hot water cylinder and a cold-water storage tank, making them suitable for properties with existing traditional heating systems.

Why choose a conventional boiler:

  • Works well with older radiators and pipework
  • Excellent for homes with multiple bathrooms
  • Can use stored hot water during high-demand periods

While they take up more space, conventional boilers are a solid option for larger households that already have the required infrastructure.

Heat Pumps and Modern Alternatives

For homeowners looking to reduce their environmental impact, air source or ground source heat pumps are efficient alternatives. They draw heat from the air or ground, offering lower running costs and reduced carbon emissions.

At Speedy Jet Plumbers, we can help you determine whether a hybrid or renewable heating system is right for your property and budget.

Comparing Boiler Costs and Installation Prices in London

When planning a new boiler installation, understanding the cost breakdown is essential. The price can vary depending on the type of boiler, the complexity of the installation, and the brand you choose.

Generally, new boiler installations in London start from £1,375 + VAT, which includes professional fitting and safety certification.

Boiler Type Estimated Installed Cost Ideal For
Combi Boiler £1,375 – £2,500+ Small homes and flats
System Boiler £1,800 – £2,800+ Medium-sized homes
Conventional Boiler £2,000 – £3,000+ Larger or older homes
Heat Pump £5,000 – £12,000+ Eco-friendly homes

Additional cost factors include:

  • Boiler relocation or new pipework
  • Upgrading flues and ventilation
  • Replacing radiators or thermostats
  • Adding smart heating controls

At Speedy Jet Plumbers, we provide clear, upfront quotes with no hidden charges. Our team helps you choose the best solution for your home and budget.

Request a free estimate today through our Book an Appointment page.

Choosing the Right Boiler Installation Company

Selecting a professional and reliable boiler installation company in London ensures the safety and longevity of your new system. Poor installation can lead to inefficiencies, higher running costs, and even safety hazards.

Here’s what to look for:

  1. Gas Safe Registration: Always confirm the engineer is legally qualified to work with gas appliances.
  2. Experience and Reputation: Choose a company with proven expertise and positive customer feedback.
  3. Transparent Pricing: A reputable company provides clear, itemised quotes before work begins.
  4. Warranty and Aftercare: Look for companies that offer post-installation support and service guarantees.

At Speedy Jet Plumbers, our engineers are fully Gas Safe registered and approved installers for leading brands such as Vaillant, Worcester Bosch, Ideal, and Baxi. We take pride in offering professional workmanship, honest advice, and dependable service to every customer.

Find out more about our Gas Safe Engineers in London.

Legal and Safety Compliance for Boiler Installation

Safety and compliance are vital when it comes to gas boilers. UK law requires all installations to be completed by a Gas Safe registered engineer.

Additionally, your installer must notify local building control of the installation, ensuring it meets all Building Regulations. You should receive a Building Regulations Compliance Certificate once the work is completed.

At Speedy Jet Plumbers, we handle all compliance requirements on your behalf. Every installation is documented, certified, and tested for safe operation. We also check carbon monoxide alarms, flue positions, and ventilation standards to guarantee full legal compliance.

How Long Does a New Boiler Installation Take?

The installation time for a new boiler depends on the complexity of the project and the system being installed.

  • Like-for-like replacement: Typically completed within one day.
  • System upgrade (e.g., conventional to combi): Two to three days.
  • Boiler relocation: May take up to three days due to additional pipework.

To prepare your home:

  • Clear access to your existing boiler area
  • Ensure engineers can reach your gas meter and water supply
  • Discuss potential downtime with your installer

Our team at Speedy Jet Plumbers works efficiently to minimise disruption, keeping you informed at every stage of the process.

Why Choose Speedy Jet Plumbers for Your Boiler Installation in London

Choosing Speedy Jet Plumbers means choosing quality, reliability, and expertise. We are proud to be one of London’s most trusted names in boiler installation and replacement.

What sets us apart:

  • Over 40 years of experience in plumbing and heating
  • Fully qualified Gas Safe registered engineers
  • Transparent pricing and no hidden fees
  • All installations guaranteed for quality and performance
  • 24/7 emergency service available across London
  • Approved installers for top boiler brands

We are committed to providing safe, professional installations that deliver long-lasting results. Whether you need a boiler replacement in Pimlico or a full system installation in Mayfair, we are here to help.

Conclusion

Installing a new boiler in London is an investment in comfort, safety, and efficiency. A modern system not only reduces energy consumption but also enhances your property’s value and reliability.

At Speedy Jet Plumbers, we make boiler installation simple and stress-free. From selecting the right system to professional installation and aftercare, our team ensures every project meets the highest standards of safety and performance.

If you are ready to upgrade your heating system, contact us today for expert advice and a free, no-obligation quote.

FAQs – New Boiler Installation in London

How long does a new boiler installation take?

Most installations take between one and two days. Complex upgrades or relocations may take slightly longer.

What size boiler do I need for my home?

The right boiler size depends on your property size, number of bathrooms, and water usage. Our engineers can assess your home and recommend the ideal option.

How can I tell if I need a boiler replacement or repair?

If your boiler is more than 10–15 years old, frequently breaks down, or causes high energy bills, a replacement may be more cost-effective than ongoing repairs.

Are Speedy Jet Plumbers Gas Safe registered?

Yes, all our engineers are fully Gas Safe registered, ensuring every installation meets strict UK safety standards.

Do you offer emergency boiler installation or repairs?

Yes, we provide 24/7 emergency plumbing and boiler services across London. Whether you have no heating or a boiler fault, our team is ready to help.

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