The 5 Best Boiler Specialists in London for a Warm Home and a Cooler Bill
A freezing house and an ice-cold shower make for a miserable start to any morning in the capital. Boiler problems rarely happen at a convenient time, and hunting for an engineer usually means leaving desperate voicemails while shivering.
If you would rather skip that chaos, you need someone who answers quickly and holds the right safety credentials. We researched and compared local providers, looking at their qualifications, prices, and terms of service.
Here are the best boiler specialists in London, and what each one handles best.
How much does a boiler repair or replacement cost in London?
In London, boiler repairs cost £80-£149 per hour, while a full combi boiler replacement costs £1,995-£4,200 before value-added tax (VAT).
| Option | Typical Price |
|---|---|
| Annual Boiler Service | £80 – £150 |
| Hourly Repair Rate | £80 – £149 / hour |
| Emergency / Evening Repair | £120 – £180 / hour |
| Landlord Gas Safety Record (CP12) | £60 – £149 |
| Combi Boiler Replacement | £1,995 – £4,200 |
| System / Regular Boiler Replacement | £3,000 – £6,000 |
1. The Marylebone Plumbers
Website: https://themaryleboneplumbers.uk/
Address: 39A Marylebone Lane
Contact: 020 7101 8151 / [email protected]
Hours: Monday to Sunday: Open 24 hours
The team at The Marylebone Plumbers has worked on Central London properties since 1988, so they know how to handle tricky building layouts.
They’re Worcester Bosch- and Vaillant-approved installation specialists, meaning their engineers are manufacturer-trained on these heating systems.
When we contacted them about a sudden breakdown, they confirmed that their urgent callout service runs day and night, with same-day visits available.
They also use transparent pricing, so you know the cost before any work begins and don’t have to worry about hourly fees adding up unexpectedly.
Plus, their Gas Safe engineers can upgrade central heating systems and carry out annual servicing to help keep your warranty valid.
However, their installation services focus mainly on Worcester Bosch and Vaillant systems. If you prefer another brand, it’s best to ask if they can supply and install it.
| Pros | Cons |
|---|---|
| 24/7 emergency boiler breakdown support | Installation partnerships focus on two main brands |
| Same-day callouts for urgent jobs | |
| Transparent agreed pricing structure | |
| Gas Safe registered engineers |
Customer Reviews
We can’t recommend him highly enough
… From initial break down of the boiler to firing up the new one we were only a day without heating and he fixed us up with temporary hot water in the meantime, so we didn’t miss a single shower. He is extremely competent and experienced and has excellent communication. His pricing is clear, honest and fair and on top of this he and his team of engineers are lovely people to work with. We can’t recommend him highly enough. We just hope he’s available next time we need him! Thanks so much Tony, Dom & Tara. …
— domley | Google Review
They were exceptional from start to finish
Hiiiighly recommend this team for your plumbing needs. I had my boiler replaced and they were exceptional from start to finish – answered all of my questions and did a stellar job. I will be using them forever more, given my positive experience with them and all of the other reviews to back it up.
— Aleata Alstad-Calkins | Google Review
2. Heat Knights Boiler Repair London
Website: https://hkboilerrepairlondon.co.uk/
Address: 3 Omega Works, Harringay Warehouse District
Contact: 020 3002 4997 / [email protected]
Hours: Monday to Sunday: Open 24 hours
A faulty heating system is stressful enough without worrying about the same part breaking again next week. Heat Knights Boiler Repair London helps ease that concern by offering a 12-month warranty on their repairs.
Their accredited engineers work with a wide range of boiler brands, from Viessmann to older Baxi models, so they can diagnose different types of faults.
They can even provide landlord gas safety certificates and commercial boiler services for businesses.
If you need a full boiler replacement, their installation packages include system testing and Building Control registration.
Even better, they offer separate prices for repairs and routine servicing, making it easier to compare quotes.
But remember, the quoted prices don’t include VAT, so your final bill will be higher once tax is added.
| Pros | Cons |
|---|---|
| 12-month warranty on repair workmanship | Published prices exclude VAT; expect a higher final bill |
| Separate service and repair prices available | |
| Accredited for multiple boiler brands | |
| Commercial and landlord services available |
Customer Reviews
Exceptional speed and engagement
Two weeks since the installation of a Valliant boiler and smart controls by the team at Heat Knights and I couldn’t be happier – given the exceptional speed and engagement experienced from the very first phone call till the end of the job.
After a desperate call to replace a failing boiler ASAP, the guys – despite being booked up – were able to cultivate time to get it sorted within 24 hours. …
— Nathan Goulbourne | Google Review
Simon solved it
Heat knights fixed a very problematic commercial boiler heating system we have in our gym! It’s been working great ever since! It was a joy to see a engineer with a knowledge of the industry, after two firms could not get to the bottom of the boiler issue Simon solved it! can’t thank heat knights and the team enough highly recommend them!
Kristen
— Kristen McCormick | Google Review
3. PCH Boiler Repair London
Website: https://www.pchboilerrepair.co.uk/
Address: 39 Warrington Crescent
Contact: 07769 555030 / [email protected]
Hours: Monday to Sunday: Open 24 hours
PCH Boiler Repair London stocks their service vehicles with common parts, increasing the chances of fixing your boiler on the first visit.
The team works with several domestic boiler brands and has specialist knowledge of Vaillant models, including older systems up to 25 years old.
In fact, one homeowner we spoke to shared that PCH attended their midnight boiler breakdown and restored their hot water before breakfast.
They also provide landlord CP12 certificates and complete central heating replacements.
The main catch is that the fixed repair rate covers labour only, so replacement parts cost extra. Your final bill could rise if the boiler needs a major component.
| Pros | Cons |
|---|---|
| Replacement parts stocked in service vehicles | Replacement parts are charged separately |
| Vaillant repairs for models up to 25 years old | |
| 24/7 emergency repair availability | |
| Landlord gas safety certificates provided |
Customer Reviews
George was outstanding in helping me with my broken boiler
George was outstanding in helping me with my broken boiler. He has exceptional knowledge and takes the time to explain the issues very clearly and in detail. George also identified that my boiler had been installed in non-compliance with Building Regulations & Gas Safety Law. Given I was a first-time buyer with minimal knowledge, George took additional time out of his own non-working hours to help guide me on how to resolve, who I should be speaking with, and what I should look out for. I am very grateful for George’s help and couldn’t recommend him enough.. Thanks again.
— Wes Jones | Google Review
Very knowledgeable and offered a very good price
I contacted PCH boiler for a repair and immediately Maher answered and offered his services straight away despite it being a Sunday. He came within 2 hours and fixed my boiler which meant I now have hot water running. He is very knowledgeable and offered a very good price. He also taught me how to avoid future issues like this. I highly recommend Maher, He is honest and very good at his job. Any issues with your boiler contact PCH repair immediately, they will get the job done I assure you.
— Sufian Miah | Google Review
4. Bailey Gas & Heating LTD
Website: https://www.baileygas.co.uk/
Address: 86–90 Paul Street
Contact: 07805 258004 / [email protected]
Hours: Monday to Friday: 8:00 AM to 5:00 PM (excluding bank holidays); Emergency callouts: Available 24/7
Bailey Gas & Heating LTD brings over 25 years of industry experience and holds City & Guilds qualifications alongside Gas Safe registration.
The team takes a diagnostic-led approach to find the root cause of pressure drops before recommending a repair.
Their thorough servicing includes flue gas analysis, safety device testing, and component cleaning to help keep your boiler running efficiently and energy bills under control.
If you need an upgrade, they also provide itemised quotes, fully commission the new system, and can install smart controls to help energy-conscious households manage their heating.
You can even book annual maintenance easily through their online system.
However, they round hourly labour charges up to the next full hour unless you agree on a fixed quote beforehand. This means even a short overrun could increase your bill.
Customer Reviews
Nothing short of excellent
We’ve known Jason for years and have always found him to be nothing short of excellent. He’s incredibly skilled, reliable, efficient and, above all, genuinely friendly and approachable.
Jason has helped us with everything from installing our new boiler and working on pipework to sorting out our heating and hot water. We’ve always been impressed by the quality of his work and the care he takes to make sure everything is done properly. …
— Gary Mazin | Google Review
By far the best plumbers/heat technicians I have encountered so far
We have recently replaced our boiler and installed a water pressure tank in our flat with Bailey Gas. Due to the layout of our flat, the boiler replacement was a complex job involving a few days of work and a cherry picker – many other heat technicians told us it couldn’t be done. Jason and his team handled this job brilliantly and without any issues whatsoever. They are by far the best plumbers / heat technicians I have encountered so far and looking forward to working with them again.
— Alexandru Mocanu | Google Review
5. Boiler Repairs London
Website: https://boiler-repairs-london.com/
Address: 75 Banbury House, Banbury Road, Hackney
Contact: 020 3667 2587 H
Hours: Monday to Friday: 8:00 AM to 5:00 PM
The founder of Boiler Repairs London brings over 20 years of local heating experience, so customers can rely on an experienced professional.
They also make their Gas Safe registration number and combustion-related qualifications easy to find, so customers can check their safety credentials before booking.
Service-wise, they can repair a wide range of domestic boilers, including models from Ideal, Potterton, Glow-worm, and Baxi. They even offer power flushing and central heating upgrades to help keep heating systems running smoothly.
For larger projects, they can manage bathroom renovations, including electrical work when needed. Landlords can even request CP12 gas safety certificates for their rental properties.
But remember, they’re based in Hackney and mainly serve North, East, and Central London, so jobs farther away may not be accepted.
Customer Reviews
Very knowledgeable, friendly, professional
I have used Paul’s services for the first time after reading reviews online and let me tell you – I’m very glad I did. He is very knowledgeable, friendly, professional and above all, polite honest person. He took the time to explain what he was doing during the boiler service, also I really appreciated his excellent advice on various system faults and other plumbing stuff. After seeing that I had a faulty room thermostat, Paul very kindly offered to replace it with a working one from his van. I will definitely use Paul again for all future central heating…
— Chan Sudra | Google Review
The best heating engineer I have met
I have used various heating engineers over the years and, despite some of them being extremely good, none of them reach the overall standards of Paul Brooke from Boiler Repairs London.
Paul is quite simply the best heating engineer I have met. He is polite and friendly, his communication is clear and concise, he accepts a challenge and finds solutions and the quality of his work is exemplary.
Paul did everything he could to meet our needs and made intelligent, well-considered suggestions to resolving any small complications. …
— David Niblock | Google Review