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Boilers, Heating, Plumbing & Much More

Cardiff Plumbers

NJ Harkus Plumbing and Heating Ltd is a family run company that has been serving customers in Cardiff for more than 15 years.
We are highly rated plumbers in Cardiff and we take great pride in all the work that we carry out.

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Our Services

Whether you need to have your boiler serviced or fix a leaking pipe, our team of Cardiff plumbers are available all day, every day at your convenience. Below you can find some of our services that we provide throughout Cardiff and the surrounding areas.

Excellent Local Reputation

Our team are highly rated plumbers in Cardiff and this can be seen upon all of the trade review platforms online. No matter what plumbing or heating problem you may have, our team of plumbers have the expert knowledge to fix the problem in the most cost effective method. Our qualified team are also trained to a high standard to carry out all boiler installations, repairs and maintenance.

All work carried out by NJ Harkus Plumbing and Heating Ltd is fully insured and there is no job that we would decline or haven't seen. All of our plumbers also hold valid City and Guilds Qualifications too.

If there is any element of Gas when carrying out work, your safety is paramount. For complete peace of mind, the team at NJ Harkus Plumbing and Heating Ltd are Gas Safe Registered (518700).

We've been working across Cardiff and the South Wales area for more than 15 years now and our work is always performed to the highest of standards. Whether you need a boiler installed or your central heating looked at, we are the "go-to" plumbers in Cardiff.

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Cardiff Boiler Specialists

At NJ Harkus, we take great pride in being the "go-to" specialist for boiler installation, repair, and servicing in Cardiff.

Our team of Gas Safe registered heating engineers operate tirelessly, ensuring round-the-clock availability to tackle any boiler challenge that you may encounter. Working with trusted boiler brands such as Vaillant, Viessmann, Worcester, Baxi, Ideal, and Potterton, we can install, repair, or service any type of boiler. With NJ Harkus, you're not just getting boiler services – you're gaining a trusted engineer committed to keeping your home warm, safe, and comfortable year-round.


Experience a stress-free boiler installation that perfectly suits your home. Our expert team of engineers guarantee years of reliable performance and energy efficiency tailored just for you.


We understand the urgency of boiler breakdowns. Our Gas Safe registered engineers excel in emergency boiler repairs, swiftly diagnosing and resolving issues, ensuring your comfort and safety without delay.


Keep your boiler running smoothly with NJ Harkus. Our meticulous servicing, including thorough inspections, cleaning, and tuning, ensures peak efficiency and year-round comfort, backed by our unwavering commitment to quality.

We take great pride in being reliable emergency plumbers in Cardiff and our aim is to respond to your emergencies within the hour. All of our vans are fully equipped with the tools and materials required to tackle any emergency plumbing job in hand.

As well as being able to respond to emergencies in Cardiff, we also cover the surrounding areas such as Radyr, Penarth, Pontcanna, Rumney and further afield.

As leading plumbers in Cardiff, we hold an excellent reputation across South Wales that we maintain with all jobs carried out by our team. Our reputation is showcased via our Google Reviews and across all social media platforms where we regularly post our work.

If you have a water leak, no heating or any other emergency, our team are on hand 24 hours a day (where applicable) to take care of any issues.

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Why Use NJ Harkus As Your "Go To" Plumbers in Cardiff

Professional Cardiff Plumbers

With over 15 years in the trade and an excellent local reputation, we are one of the most rated plumbers in Cardiff.

Whether we are fixing your toilet or installing a brand new boiler, we take great pride in our work and ensure that it meets your expectations. Our experience also means that there is no job that we won't be able to solve.

Fleet of Vans

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Registered Heating Engineer

All of our team of Cardiff plumbers are Gas Safe Registered (518700) and are qualified to work with gas.

In our vans, we carry all of the tools and equipment on-board to ensure that any job can be safely completed onsite.

What Do Our Customers Say?

I can't recommend Nathan and his team enough. Professional, efficient and knowledgeable. They even left the place tidier than when they arrived. I needed a boiler replacement and they were done in 2 and a half hours! They turned up on time, tidied up as they went and put down cardboard and dust sheets to protect my carpet. They were also always willing to share what they were doing and happy to answer all my questions. I will definitely be using them again, should I need a plumber for anything. Chris Walker
Nathan was extremely helpful after discovering our boiler needed replacing ASAP during a service appointment. He and his team were on time and respectful with our sleeping baby upstairs. When they arrived, they were really prompt as they finished the job in half a day. They were also very knowledgeable in their trade. I have no doubt they have done an excellent job and that we will have no problems going forward. I would highly recommend this service and I will be using them again in the future. Henrietta Lewis
I very rarely write reviews. I only write them when I receive exceptional service. Nathan and his team have provided just that. They turn up when they say they’re going to turn up, and they get the job done. No questions asked. It’s rare nowadays to get tradespeople that deliver like this. We’ve just had a ton of work done on our new extension and they’ve been there every step of the way - from the first fix, to installing underfloor heating and a full boiler replacement. I cannot recommend them enough. Simon Watts

Testimonials Sourced From Google Maps

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180 Ffordd James McGhan, Cardiff, CF11 7JU
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