Annual boiler service is necessary for every home!

    It is extremely important to do at least once a year, to know if your boiler healthy or needs repairing. If you don’t, you may end up with costly repairs that can be avoided or losing your manufacturer’s guarantee. They also improve boiler performance. professional gas engineer can also identify any potential issues early on.
    Book your service with our reliable experts in North London and get serviced before the winter sets in to ensure it’s running smoothly.

    Schedule an appointment today from our website or call us at 020 8355 0840 or e-mail us at

    Our friendly customer service representatives are waiting to take your phone call.

    MML Plumbing is a Gas Safe registered company in North London


    Our team is highly trained, and we pride ourselves on going the extra mile to make sure your Vaillant, Worcester-Bosch, Baxi, or Ideal is running in tip-top shape. Think of us as an annual service plan for your home.

    These are the steps we carry out on a boiler service:

    • Visual check for any sign of spillage.
    • Flue inspection and termination – flue joints have to be visible for inspection.
    • If it’s necessary we clean the burner, heat exchanger, injector, and combustion chamber.
    • Checking the seal integrity
    • We check the safety operation.
    • We test the operation in heating and hot water mode
    • We top up the pressure in the system.
    • We carry out a gas rating test to check the correct operation
    • After the gas rating inspection, we can confirm that your boiler is up to safety standards. We also take note of everything.
    • We check the minimum gas pressure.
    • We carry out a combustion analysis to check the perfect operation. This is the most important part of our annual service.
    • The flue integrity.
    • We clean your condense trap and magnetic filter.
    • The radiators with a thermal imaging camera, bleed out the air and check the operation of the thermostatic valve.
    • The final step will be a gas tightness test, so we can ensure all the joints are gas-tight and there is no gas leak.
    • We check any other appliance that is on your property.
    • We also give you advice on how you can improve the heating system efficiency.
    • We fill up your benchmark in the manual which shows that the safety checks were carried out by a qualified gas safe engineer. If you ever have to claim on your boiler you have the details that you maintained it every year to a high standard.

    Read more about what’s included in a boiler service?


    The more you maintain your boiler, the longer its life will be. And we all know that safety is a top priority for everyone. Make sure to get your appliance checked out by an experienced boiler expert who can identify and prevent it before they become a serious hazard!

    Boiler performance

    You want to be comfortable in the cold and have a warm home without paying through the nose. You can achieve this by regularly servicing your boiler by our boiler experts. A well-maintained system will provide you with comfort during colder months while also saving on energy costs throughout the year-round.


    Any major boiler fault can put lives at risk. Carbon monoxide is a silent killer. Make sure you install a carbon monoxide alarm close to the boiler and maintain your appliances regularly.

    Longer boiler life

    Annual boiler servicing will increase the appliance performance and also our boiler technicians can discover minor boiler problems. By cleaning out the heat exchanger and burner will increase the boiler performance and save you money on entry bills in the long run.

    Keep the guarantee

    To keep your boiler guarantee all manufacturers recommend annual servicing. Get your boiler serviced annually by our registered gas safe engineer and you can make a claim to the manufacturer when needed. Your gas appliance guarantee will be void without a yearly boiler service. If you need to make an insurance claim, this is the only way to go about it!


    During the boiler service, our expert gas safe engineers will carry out a series of tests making sure the appliance is working safely and efficiently. If the expert will find some issues he can fix them on the same day. Also, this is much cheaper. Our specialists have to carry out the boiler service to prevent the need for boiler breakdowns in the future.

    On the other hand, boiler repair is about fixing major defects, leaks. As everyone knows boiler parts are expensive, so it will cost you more in labour and materials.

    The boiler service doesn’t include repair. 

    The boiler repair is to fix the fault in the boiler. After that, you can ask for an annual service.


    Gas safety checks involve all the gas appliances inspection. The engineer will check every single appliance in your home and point out any faults that he will come across, which ensure you are safe from potential disaster.

    During this type of investigation, we will inspect only the gas boiler performance and safety. If there are any problems with it, then you can expect them to fix it for you if you would like to go ahead with a separate work. Our boiler experts also check how the central heating system operation. Our engineer is making sure they leave the appliances in a good working operation.


    We are a team of experts that have been working in the industry for many years, and we enjoy providing high-quality plumbing, gas and heating services to homeowners. We work with a wide variety of clients in North London as well as surrounding areas – so if you live nearby and need help and more information with your gas boiler service, give us a call at 020 8355 0840 so we can take care of your boiler safe operation.


    Denise Fallon
    Denise Fallon
    WOW.... what fantastic service... Levy arrived at the time I was given. He was totally professional, in capping my gas pipe. Unfortunately, he had to remove it all, as previous engineer left it short! in order for an Induction hob to be fitted. He went above and beyond what he came to do. He also checked my boiler as he was not happy about the pressure.. would definitely use MML again.. and I can highly recommend them..
    Charlie Charlton
    Charlie Charlton
    Did not have a 'regular' plumber in north London, so took a punt and mailed a few from Google search. MML came back immediately, great communication, good price for the work (which was not a simple job) and the engineer was excellent - friendly, professional and super hard working. Three long days for what was hoped to be a two day job, no moaning when it became more complicated (due to the old system being problematic), definitely reccomend.
    Martin Lawlor
    Martin Lawlor
    This was my second time using MML Plumbing. The plumber arrived on time, assessed the problem and did his best to resolve it. It was all completed within the hour and I am very pleased with the result. A very clean and tidy job done.
    Emily Harper
    Emily Harper
    MML Plumbing were really efficient, turned when he said he would, gave an accurate quote and did the job on time with no mess. I would definitely recommend them!
    Heidi Southall
    Heidi Southall
    I called MML Plumbing to investigate a boiler fault and they were very helpful and quick to respond. The engineer, Mike, arrived earlier than expected and was friendly and professional. He thoroughly explored the problem(s) and fixed what he could. Unfortunately, it is a problem that the manufacturer will have to deal with (due to availability of parts). Mike was very honest about this and, here is the amazing part, he did not charge me today as he couldn’t fully resolve the issue! Am so impressed and would not hesitate to call this family business out again.
    WH Acting
    WH Acting
    MML Plumbing did an excellent job. The engineer was very thorough with the safety checks, boiler service and Gas Safe certification of two properties he worked at for me. Very good value for money, very good service. Admin staff were courteous and friendly over phone and email and we very prompt with sending all paperwork and copies of photographs to me. Highly recommended!
    Ronald Watt
    Ronald Watt
    Katrina Perez
    Katrina Perez
    This is the third time I have used MML plumbing. They are by far the most helpful and efficient plumbers I have used. They have installed a boiler, replaired radiators, replaired and shower and toilet for me - all work is to a high standard and every repair explained in full. HIGHLY RECOMMEND
    Laurent VT
    Laurent VT
    Fantastic service! Our boiler stopped working unexpectedly. MML Plumbing came quickly, diagnosed the problem and resolved it immediately to make sure we weren’t without radiators for too long. Very impressed with the expertise, friendliness and communication. They also gave us tips for maintenance. Highly recommended!
    Jill J
    Jill J
    Replacement of fill valve. Efficient, professional and pleasant plumber.


    We at MML Plumbing Ltd are a professional company with over 15 years of experience in the industry. We have an experienced team of plumbers and gas safe engineers and boiler experts who know how to work on a high standard, which is why we can provide you quality service for your home or business North London area.

    Here are a few reasons you might decide to work with us:

    • Knowledgeable and friendly office support.
    • Reliable and qualified plumber, heating and gas specialists
    • Affordable and realistic prices.
    • Fixed rates and no surprises at the end of the work.
    • Fast solutions.
    • 24-hour online help & quotation.

    For emergency gas leaks contact the national gas emergency service.

    If you thinking about installing a new boiler call our company today at 020 8355 0840 and book an installer for a survey. Or read our boiler installation guide.

    For next-day boiler service contact us today on one of our services! You won’t regret it! Customers’ satisfaction is guaranteed.

    For a bigger works estimate go to our online quotation page.



    1.What is the annual boiler service?

    Annual service is a visual inspection of your boiler, identifying any damage or fault that need to be fixed before other things will arise.

    2.Why should I have my boiler serviced annually?

    If you service your gas boiler manually, it will operate safely and efficiently. You’ll also maintain the warranty from the manufacturer! Regular services reduce the chances of a breakdown during wintertime.

    3.What does a boiler inspection involve?

    The service involves inspecting the boiler parts. Our boiler engineers will check if there is any leak on the pipes or crack on the seals, as well as checking the performance and operation of your system to ensure no problems arise.

    4.How much does it cost to service a boiler in London?

    Your boiler basic service can cost as little as £89. Depending on where you are located in the UK and what’s going wrong with your boiler it might only take an hour to get the service done.

    5.What happens if you don’t service it?

    If you don’t maintain your boiler every year, the manufacturer warranty won’t cover the boiler anymore. Meaning a breakdown could cost more than just money if it’s not resolved quickly and properly.

    6.Do plumbers service boilers?

    A few plumbers can do a boiler service until he/she is gas safe registered. Only a gas safe engineer can work on any gas boiler.

    7.How often should I have a boiler service?

    Every 12 months.


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