Expert Boiler Repair in Cardiff

Book your repair online or speak to one of our experts for further assistance, and rest assured that we’ll promptly respond to your enquiries.

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Just 3 Steps

To Your Problem Solved With We Cover Boilers.

Answer a few simple questions about your boiler
Book your repair date
Our boiler expert will visit and fix the problem
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Fees

Fixed Prices

ServicePrice (inc. VAT)
fixed price boiler repair labour£102

Controls

Control issuesFixed price (inc. VAT)
External clock/thermostat (not smart controls)£120

Boiler Repair Options

Boiler issuesFixed price (inc. VAT)
Sensor£95
Electrodes£110
Plate heat exchanger£185
Fan£220
Add a boiler service whilst on site£65

When Your Boiler Stops Working, Call Us!

Our expert boiler repair service is here to quickly and effectively resolve any issues with your heating or hot water system.

We offer boiler repairs across the Cardiff, Newport, Penarth, Barry and Caerphilly areas.

Our skilled technicians are equipped with the knowledge and tools to diagnose and fix heating and hot water problems. With our fast and reliable service, you can trust us to get your boiler up and running in no time.

We provide comprehensive boiler repairs for all makes and models. Whether it is a simple fault or a major issue, our boiler repair Cardiff team has the skills and experience to get your heating system running smoothly again.

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When There’s No Hot Water, We Can Help!

Our team of boiler experts has years of experience repairing heating and boilers, and has seen most of the problems that occur. Our local knowledge sets us apart from the rest. We know what to look for and how to complete the repairs fast. 

  • Boiler leaks
  • Boiler fault codes
  • Cold radiators
  • No water
  • Low gas pressure
  • Broken controls
  • The timer not working
  • Non-firing boiler

Boilers Fixed Quickly

We are confident we can get your boiler working properly again in no time. Our team is happy to fix combi, system and regular boilers with a variety of issues.

Our team starts by checking your boiler and heating carefully before identifying the fault. Once we have pinpointed the problem, we can let you know the cost of repairs and get to work quickly. 

Boilers don’t always stop working completely – they often develop faults that mean they aren’t working properly. Modern boilers often display a fault code, but if you’re not sure what to do next, we can rectify the issues and leave you with a boiler that runs properly again.

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Common Boiler Repair Issues

Every day, we encounter common issues that could be signs that your boiler requires repair. If you suspect that your boiler is not functioning correctly due to any of the following problems, please don’t hesitate to contact us.

If your radiators are not getting hot, or if you’re not getting any hot water from your taps or shower, this could indicate a problem with your boiler’s heat exchanger or pump.

Rattling, banging or other unusual noises coming from your boiler may be a sign of a problem with the pump, fan or heat exchanger.

If your boiler’s pilot light won’t light or keeps going out, this could indicate a problem with the thermocouple or gas valve.

A drop in your boiler’s pressure could be caused by a leak in the system or an issue with the Expansion vessel or pressure relief valve.

In colder weather, the condensate pipe that carries waste water from your boiler to the drain outside can freeze over, causing your boiler to shut down.

If your heating system won’t respond to changes in your thermostat settings, it could be a problem with the thermostat itself, or with the wiring connecting it to your boiler.

A leak in your boiler could be caused by a damaged seal, a corroded pipe, or a faulty pressure relief valve.

If your boiler keeps switching off before it reaches the desired temperature, it could be a sign of a faulty thermostat, pressure sensor or pump.

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See What our Customers Say About Us

Catherine Hughes profile picture
Catherine Hughes
18:44 20 Jan 26
DMK plumbing have done a fantastic job replacing my boiler and taking away the old boiler and water tanks. They gave me clear, honest advice and a transparent, comprehensive quote. As important, they came when they said they would and did a neat and tidy job. I’m really pleased with the job and would recommend them.
Caroline Munkenbeck profile picture
Caroline Munkenbeck
12:15 17 Jan 26
Our boiler broke down just before Christmas and Kosta fitted new boiler in time for Christmas working until 8pm to do so. He's a really pleasant guy, does a great job and is a great communicator via text and phone. If we have any other plumbing issues he'd be our first port of call and we would readily recommend him to others. We're very pleased to have found such a good, reliable plumber.
Emily Konto profile picture
Emily Konto
23:42 11 Jan 26
I panicked when my boiler suddenly stopped working in my new house during freezing winter weather, on a weekend evening. I called this amazing engineer, the problem was fixed in no time! The service was amazing the engineer was polite, efficient, and reassuring he helped immediately, and everything was working perfectly afterward. Thank you so, so much!
Becky Greedy profile picture
Becky Greedy
17:48 11 Jan 26
Fantastic service, quick responsive and very reliable, explained the problem and how to fix it ourselves should it happen again next time. Would fully recommend
Phil McNeill profile picture
Phil McNeill
16:19 31 Dec 25
Excellent service - super quick same day replacement of my shower!
Lois Grayson profile picture
Lois Grayson
22:36 19 Nov 25
What a real gentleman! So incredibly helpful when guests arrived at my holiday let late at night and couldn't get the heating to start. Costa was very quick to respond despite it being 10 pm, understood the urgency (13 degrees, a cold November night and a tiny baby don't mix well), and sorted out the issue in a very short space of time. Not only that, he had a calm and reassuring manner which helped as the tired and freezing parents were getting worried. Thank you very much!
Laurie Perdikis profile picture
Laurie Perdikis
12:15 14 Nov 25
We’ve had an excellent experience with DMK Plumbing. From start to finish, the service was professional, efficient, and genuinely friendly. We’ve had a new radiator installed, a full boiler service, a toilet flush repaired, and new taps fitted — all completed to a really high standard.

They arrived on time, quickly diagnosed any issues, and explained everything clearly. Pricing was fair and transparent, and the quality of workmanship was spot on.

It’s refreshing to deal with a tradesperson who takes pride in their work and values good customer service. I wouldn’t hesitate to use DMK Plumbing again and highly recommend them to anyone in need of reliable plumbing help.
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Frequently Asked Questions

The time needed to repair a boiler can vary depending on the issue at hand. A professional technician will be able to provide a better estimate once they have assessed the problem.

If you’re uncertain about the issue, there’s no need to worry. Simply describe what you can observe or hear coming from the boiler. We’ll handle the rest once we arrive.

We understand that our customers are not expected to be experts in boilers; otherwise, they wouldn’t require our assistance. Any information you can provide before our visit would be highly valuable and greatly appreciated.

Before we proceed, we aim to reach an agreement on a fixed price quote. However, if that isn’t feasible, our pricing operates on an hourly basis. We have a minimum charge for one hour and fixed rates for specific services.

Our prices are competitive in comparison to other boiler repair services in Cardiff. Additionally, there’s no need to be concerned as we do not levy any additional fees for emergency call-outs!

A room thermostat is a device used to regulate the temperature of a room by controlling a heating system. It works by sensing the temperature of the room and then sending a signal to the heating system to turn on or off as needed.

A combi boiler, or combination boiler, is a type of boiler that combines both heating and hot water functions in a single unit. It differs from other types of boilers in that it does not require a separate hot water storage tank, making it more space-efficient and convenient for smaller homes.

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