Boiler & Heating Services in London

Fixed-price new boiler installation in London 

Next-day installation available with up to 10-year warranties

Call today: 02083550840 or request your free quote online.

 

Upgrade to a modern energy-efficient boiler and start cutting your energy bills from day one. With MML Plumbing, you get a transparent fixed quote, fast installation, and up to 10 years’ warranty on leading brands like Vaillant, Worcester Bosch, Ideal & Glow Worm.

    Not Sure What’s Causing the Problem? We Find the Cause — Then Fix It


    From hidden leaks to plumbing and heating issues, tell us what’s happening
    and we’ll assess it properly, explain your options, and get it sorted.

    How Does a Boiler Installation Work in London?

    At MML Plumbing, we make new boiler installation simple, fast & stress-free.

    Here’s how our process works:

    1

    Request a Free Fixed Quote

    Call us on 02083550840 or send us pictures of your current boiler setup. We’ll give you a transparent fixed price (no hidden extras) and full warranty details.

    2

    Planning & Materials

    Once approved, we source the best boiler for your home (combi, system, or heat-only) and prepare all parts and fittings in advance, ensuring a smooth installation day.

    3

    Installation day

    Our certified gas-safe engineers will arrive promptly, introduce themselves, and perform your new gas boiler installation with efficiency and care

    4

    Testing, Guidance & Payment

    We test the system, (chemical) flush if required, and show you how to use your new boiler. Payment can be made securely on-site by card.

    5

    Warranty and registration

    Within 1-2 weeks, you’ll receive your new gas boiler warranty and registration for complete peace of mind.

    When boiler replacement signs may actually point to hidden system leaks

    Not every boiler pressure problem means the boiler itself needs replacing. If your boiler repeatedly loses pressure, needs frequent topping up, or the pressure drops with no visible leak, the cause may be elsewhere in the heating system. Concealed leaks within heating pipework beneath floors, behind walls, under concrete or within underfloor heating systems can cause ongoing pressure loss without obvious signs of escaping water. If this is happening, read our Boiler Losing Pressure: Causes & Leak Detection guide to understand the common causes, what should be checked first and when specialist investigation may be required. Where accessible boiler components, radiators and valves do not explain the pressure loss, a specialist hidden leak assessment can investigate concealed heating pipework using evidence-led methods such as pressure testing, thermal imaging, acoustic testing and hydrogen tracer gas.

    Frequent Breakdowns: A constant need for repairs can be costly and inconvenient.

    Rising Energy Bills: Older gas boilers often lose efficiency, leading to increased energy consumption.

    Strange Noises: Banging, whistling, or gurgling sounds can indicate serious problems.

    Inconsistent Heating: If some rooms are cold while others are too hot, your boiler may not be distributing heat properly.

    Visible Wear and Tear: Signs of rusting or leakage around the boiler.

    Age: If your boiler is over 15 years old, it might be time to consider replacing it with a more efficient model.

    New boiler installation in London made simple

    5-Star Boiler Installation Reviews – Trusted by London Homeowners

    googlereviewssection
    Posted on Google Google
    Natalie Richmond profile picture
    Natalie Richmond
    02/10/2026
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    MML give a great and professional service. I felt supported throughout the fixture of my leaking shower. The initial leak finding service they offer is completely worth it and far superior to any other plumber I have had on the job. Levi, who came to the job was kind, professional and efficient. I will use them in the future for any plumbing issue I have. Highly recommend.
    Posted on Google Google
    Seamus Vaughan Lucey profile picture
    Seamus Vaughan Lucey
    25/09/2026
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    V good detection and repair service
    Posted on Google Google
    Jeanette H profile picture
    Jeanette H
    23/09/2026
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    Levi is efficient, knowledgeable, trustworthy and friendly and quickly identified the source of the plumbing problem here. Highly recommended
    Posted on Google Google
    Joann Lee profile picture
    Joann Lee
    15/09/2026
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    I’m very happy with the service I received. The workman was professional, friendly, and reliable. He quickly identified the problem with my water pipe and repaired it efficiently. He explained the issue clearly, worked carefully, and left everything clean and tidy afterwards. I really appreciate his excellent workmanship and helpful attitude. I would definitely recommend him to anyone who needs plumbing or pipe repair work. Great service from start to finish!
    Posted on Google Google
    Anjana panta profile picture
    Anjana panta
    11/09/2026
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    Levy who came in to find the look for the leak was thorough and professional. He was very helpful and explained things. The booking team was responsive and helpful as well. I highly recommend them.
    Posted on Google Google
    Darren Owen profile picture
    Darren Owen
    27/07/2026
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    MML Plumbing is hands down one of the most professional businesses I’ve ever worked with. From the moment I reached out, they were confident, reliable, and incredibly detailed. Not only was their team super quick, but the quality of their work was also of an exceptionally high standard. I couldn't recommend them highly enough—an easy five out of five stars!
    Posted on Google Google
    R Smith profile picture
    R Smith
    22/07/2026
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    A professional reliable firm, that does a thorough job.
    Posted on Google Google
    Theo Josif profile picture
    Theo Josif
    22/06/2026
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    Excellent service very quick and efficient nice professional people and fair pricing would always recommend very trustworthy
    Posted on Google Google
    Chun Nam Wong profile picture
    Chun Nam Wong
    28/05/2026
    Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
    This was our second time using MML for leak detection, and once again the service was excellent. Levi arrived promptly, quickly identified the leak, and provided clear, comprehensive advice on the next steps. He was friendly, professional, and very reassuring throughout the process. Compared to other plumbers we’ve used in the past, he gave us much more confidence in both his expertise and recommendations. We would be very happy to use MML again and highly recommend their services.
    Verified by Trustindex
    Trustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more

    Which boiler type is best for your home? Explore your options today!

    When considering which type of gas boiler best suits your needs, it’s essential to understand the various heating options available. Gas boilers come in different types, each with its advantages and suitability for specific applications:

    Combi Boiler Installation London – Compact & Energy-Efficient Heating

    Combi Boiler Installation in London – Energy-Efficient Heating and Hot Water Solutions. Combi boilers are a popular choice for London homes. Combi boiler installations offer space-saving and energy-efficient heating for modern lifestyles.

    Play
    Installing a boiler with a low NOx emission rate

    System Boiler Installation London – Ideal for Large Homes & High Demand

    System boilers, also known as sealed system boilers, incorporate a central heating boiler and an unvented hot water cylinder into a single unit. System boilers are suitable for larger properties with higher hot water demand and can provide high water pressure to multiple outlets.

    Heat-Only Boiler Installation London – For Homes with Traditional Systems

    Heat-only boilers, sometimes referred to as regular boilers or conventional boilers, consist of a heating boiler, a hot water tank, and a cold water storage tank. They are typically used in properties with existing traditional heating systems and are compatible with open-vented or sealed heating. Heat-only boilers are suitable for homes with high hot water demand or where multiple bathrooms are present, providing a reliable and consistent supply of hot water. Heat-only boilers are typically better suited for homes with low water pressure. Again, you have lots of options, from Vaillant, Baxi, Glow Worm or Worcester Bosch.

    Conventional Boiler Installation in London – Perfect for Traditional Heating

    Also known as a regular or traditional boiler, a conventional boiler is a type of system commonly used in the heating industry that features a separate cylinder or water tank for storing hot water. This means it can provide hot water to multiple taps at the same time without a reduction in pressure. It requires a cold water storage tank, usually in the attic, which feeds water to the hot water storage tank. Conventional boilers are particularly suitable for homes that already have a traditional heating and water system in place, which is connected to a separate hot water cylinder.

    Choosing MML Plumbing for your boiler replacement means opting for expert service, reliability, and energy savings. With transparent pricing, our heating engineers ensure your boiler installation is done to the highest safety and quality standards, offering a cosy, warm home throughout the year.

    We specialise in combi boiler installation, system boilers, and air source heat pumps, providing energy-efficient solutions tailored to your specific needs. Whether you’re replacing your broken boiler or looking for a modern energy-efficient upgrade, we have a wide range of boilers to fit any budget and property size.

    Why choose MML Plumbing in London today?

    • Fixed price quote: Transparent, no surprises, only fixed prices.
    • Next-day installation: Get a new boiler installed quickly and efficiently.
    • Flexible payment options: Pay the gas-safe engineer by credit or debit cards!
    • Enjoy up to a 10-year warranty on selected high-efficiency boilers for long-lasting comfort.

    With MML Plumbing, you save on energy bills and reduce your carbon emissions by upgrading to a high-efficiency boiler today. Take the stress out of your heating needs with our exceptional customer service and expert, friendly team ready to assist every step of the way.

    Landlord certificate issued by MML Plumbing for rental property

    What happens during your professional gas boiler installation?

     

    At MML Plumbing, we pride ourselves on offering a personalised approach to the installation process.

    Direct Contact: Reach out to us via email or phone to initiate the process. We’ll guide you through the steps and answer any questions you may have.

    Send Pictures: Share images of your current setup with us. This helps our team assess your needs accurately and provide a tailored solution.

    Personalised fixed price: Unlike generic online calculators, we don’t believe in one-size-fits-all solutions. By analysing your pictures and understanding your requirements, we provide a fixed, personalised price with 100% accuracy.

    Expert Consultation: Benefit from our expertise and guidance throughout the process. We’re here to ensure you get the right boiler (whether it is a heat-only or combi boiler) for your home and budget offering various payment options.

    Contact us today to get started on your bespoke installation journey with MML Plumbing.

    Choose from Top Boiler Brands: Premium boilers for any budget

    Vaillant Boilers—OUR RECOMMENDED CHOICE: As advanced installers with extended warranties, we’re proud to offer Vaillant Boilers, a renowned boiler manufacturer for its quality and innovation. 

    Worcester Bosch Boilers: This includes a 7- to 10-year warranty, ensuring safety for years to come.

    Ideal Boilers: Each boiler installation is accompanied by up to a 10-year warranty, guaranteeing smooth heating operation.

    Glow Worm Boilers: Trusted for their efficiency and performance, Glow Worm boilers are an excellent choice for reliable heating solutions. With our new installations, you can expect quality craftsmanship and dependable operation backed by our expertise.

    Transparent Boiler Installation Costs

    At MML Plumbing, we believe in transparent pricing. You’ll receive great value on all our new boilers and brands, with installation included at no additional cost. Opt for our boiler finance options to spread the cost over time, making your purchase even easier.

    Boiler Price Guide

    Worcester Bosch Boilers: Starting at around £1,800 (VAT included)

    Ideal Boilers: Starting at approximately £1,500 (VAT included)

    Vaillant Boilers: Starting at around £1,900 (VAT included)

    Glow Worm Boilers: Starting at approximately £1,400 (VAT included)

    Please contact our qualified installer for a personalised fixed-price quote based on your specific needs and circumstances.

    We installed a modern boiler in a renovated home

    Why Homeowners Across London Choose MML Plumbing for New Boilers

    At MML Plumbing, our team of experienced plumbers in London is dedicated to providing top-quality heating solutions for your home. We only install new boilers from globally recognised brands, ensuring your home benefits from the highest standards of efficiency and reliability.

    Rest assured, all our installations are meticulously audited to maintain our high standards. Our dedicated team provides excellent customer service via our web chat, offering guidance and answering any queries you may have.

    Choose MML Plumbing for professional, efficient, and reliable boiler installation. Visit our website or contact us today to get started and enjoy the comfort of a new, efficient heating system in your home.

    new boiler inspection and commissioning

    Benefits of a New Gas Boiler Installation

    A new boiler work can bring numerous benefits to your home, transforming your heating system into a more efficient and reliable source of comfort. One of the most significant advantages is improved energy efficiency. Modern boilers are designed to use less fuel while providing the same heat level, which can substantially save on your bills.

    Installing a new boiler can significantly enhance the comfort of your home in addition to energy savings. Its reliability means fewer unexpected breakdowns and repairs, ensuring your comfort and confidence during the colder months.

    A new boiler adds value to your property by offering modern, energy-efficient heating systems that attract potential buyers. Whether you plan to sell your home soon or in the future, a new boiler is a valuable investment that can enhance your property’s overall worth.

    Get a boiler quote today and discover your fixed price for a new boiler installation, tailored to your heating needs.

    Maximising Efficiency with Your New Boiler Installation

    Optimizing your high-efficiency boiler, including its heat exchanger, is crucial to maximizing its benefits. Proper installation, regular servicing, and using a smart thermostat can ensure your boiler operates at peak performance. This not only helps you save on energy bills but also ensures your central heating operates at its best. One of the first steps to achieving this is ensuring your heating system is properly maintained.

    Upgrading to a smart room thermostat ensures precise control over your central heating, letting you heat your home only when necessary. This can lead to significant energy savings, as you can adjust the temperature based on your schedule and preferences.

    Installing insulation helps maintain consistent temperatures and reduces heat loss, boosting boiler efficiency. Proper insulation reduces heat loss, meaning your boiler doesn’t have to work as hard to keep your home warm. This not only improves efficiency but also extends the lifespan of your boiler.

    Our team of experts (gas-safe registered engineers ) is here to guide how to optimize your central heating. Moreover, we can recommend the best solutions for your specific needs, ensuring you get the most out of your new boiler installation. By maximizing efficiency, you can enjoy a more comfortable home, lower energy bills, and contribute to a more sustainable future.

    Upgrade your home with professional boiler installation services in London

    FAQ

    Question not answered? Ask A Question by email

    What is included with replacement boilers and boiler installations?

    When you purchase a replacement boiler, the package typically includes the boiler unit itself along with necessary installation services. Here’s what you can generally expect:

    • The Boiler: A new boiler suited to your home’s heating requirements. ( replacement boiler is only included if needed)
    • Installation: Professional installation by a certified technician.
    • Piping and Connections: Replacement of old pipes and fittings as needed. ( if needed)
    • Initial Inspection and Assessment: An expert evaluation of your current heating system and advice on the best replacement options.
    • System Testing: Ensuring the new boiler is functioning correctly and efficiently after installation.
    • Warranty and Documentation: Manufacturer’s warranty for the boiler and sometimes for installation services. And a free boiler service.
    • Payment: We don’t provide finance options, but affordable prices that are not hard to pay. With finance, it will cost you much more.

    How much does a replacement boiler installation cost?

    The cost of replacing and installing a new boiler can vary widely, depending on several factors such as the type of boiler size of the boiler, the complexity of the installation, and the region. The boiler installation prices generally range from approximately £1,800 to £3,500 for a mid-range boiler. Higher efficiency models or those with more sophisticated technology could be more expensive.

    At MML Plumbing, we can provide you with a fixed price if you send us all the details required!

    What happens after my new installation is complete?

    Once you get a new boiler installed, here’s what typically happens:

    • Final Inspection: The installation team will perform a final check to ensure everything is properly set up and functioning as it should.
    • System Testing: They will run the boiler to make sure it starts properly and reaches the required heating output.
    • Demonstration: You will receive a demonstration on how to operate your new boiler, including the thermostat and any other controls.
    • Documentation: You’ll be provided with all necessary documentation, including the user manual and warranty details.
    • Advice on Maintenance: Tips on maintaining your boiler to ensure it runs efficiently for years to come.
    • Customer Support Information: Details on how to contact customer support if you encounter any issues or have further questions.

    How long does a boiler replacement take?

    Typically, a replacement combi installation can be completed in one day. However, the exact time can vary depending on the complexity of the job and the type of new combi boiler being installed. More complex installations that require additional piping or adjustments to your home’s heating system might take longer.

    Is it worth replacing a 20-year-old boiler?

    Yes, replacing a 20-year-old system with a high-efficiency boiler installation is a smart choice. Modern boilers can significantly reduce your energy bills and enhance your home’s heating performance. Additionally, newer models are often more reliable and come with better safety features, reducing the likelihood of breakdowns and expensive repairs. Upgrading to a new boiler can also increase the overall value of your home and improve heating performance.

    What are the benefits of replacing an old boiler with a new high-efficiency boiler?

    Replacing your old boiler with a high-efficiency model can reduce energy bills, improve heating reliability, and lower your carbon footprint.

    Request a booking

    Or call us and we'll book you in now:

    02083550840

      Can't call us? You can still request a booking by filling out the form below:

      After you complete the contact form, our team will quickly get back to you with booking times, prices, and terms & conditions.