Are you looking to replace your old boiler? Well, look no further because CS Boxall have both the skills and knowledge required to install a new, energy efficient boiler in your domestic or commercial property.

We install boilers across South Wales in areas such as Cardiff, Swansea, Newport and beyond. We are a large and well-established company serving South Wales and the South Wales and offer our clients a high quality service like no other. Our heating engineers offer a wide range of gas central heating systems to fit your property size and needs, and as accredited installers for Worcester Bosch, we provide a 5-year warranty on all Worcester Bosch installations as standard. We also provide options to extend your warranty to up to 12 years.

Boiler Installation in Cardiff and South Wales

We provide boiler installation in Cardiff and the surrounding areas, offering our clients a professional and comprehensive service at a competitive price.

Our heating engineers in South Wales install both condensing conventional gas boilers and condensing combination boilers. For a single tap system, a condensing combination gas boiler provides hot water as you need it and as much or as little as you require, meaning that you don’t pay to heat water that won’t be used. The lack of necessity for a cylinder means these boilers are smaller than other alternatives making them ideal to fit in an area where space is at a premium.

However, condensing combination boilers depend on the mains pressure, which does mean that they tend to have slower flow rates. For property owners and businesses who may prefer to use LPG, we also supply, install, maintain and service all types of LPG boilers.

We are fully insured and are accredited installers for Worcester Bosch, providing a 5-year warranty on all Worcester Bosch installations. We also provide options to extend your warranty to up to 12 years. We are also assessed by Gas Safe, as well as being members of Trustmark Installers who qualify commercial services & certification by technical abilities and audit them using proper working practices as endorsed by the government.

We install boilers for domestic and commercial clients across South Wales. Some of the areas that our heating engineers frequently cover include:

  • Swansea
  • Cardiff
  • Vale of Glamorgan
  • Bridgend
  • Newport
  • Penarth
  • Porthcawl
  • Port Talbot
  • Caerphill

Our boiler repair services in South Wales include:

  • Rainwater harvesting
  • Radiators
  • Oil tanks
  • Pipe work
  • All types of boilers
  • Link up systems for gas, oil and solid-fuel
  • Underfloor heating systems
  • Renewable energy systems
  • All types of central heating systems
  • All types of burners and stoves
  • All electrical installations

Contact us today Book Your Boiler Installation

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24/7 Emergency Plumbing/Heating Emergency Callouts

Call us on
07590 350 650
Our testimonials

What our clients are saying

First time using CS Boxall. When I phoned, the office staff were so friendly and ready to help. They got me booked in quickly. When the engineer attend he was very polite and helpful and sorted the problem out. Would definitely recommend, a fabulous service.

Donna Thomas

Excellent company, I always have them for the annual boiler service which is very reasonable but more importantly they always assist with a problem. No hot water or heating last night, I left a voicemail and the engineer called at 8.15am and arrived at 10am, fault found and fixed. A big thanks to Alan for this and the office staff for sorting, would highly recommend CS Boxall

Heather J

Amazing service, fixed my broken washing machine pipe in no time and I got an apportionment straight away too. Will Definitely use again.

Hayley Smith

I must say that your boys and your team were absolutely fantastic in the quality of work, the organisation of trades were to super professional level.

You must be really proud.

Paul Smith

I would like to say thank you for the recent shower works carried out. We are so pleased. All aspects of the work were dealt with so professionally and at all times staff were so accommodating regarding dates /times etc.

Rhys was particularly helpful. Would highly recommend your company.

Amanda Drew

I would just like to send a huge message of thanks to your engineer who sorted out our Rayburn boiler/timer problem last Tuesday. Please tell him it’s working perfectly now and convey our gratitude to him for his perseverance .

Thanks to your company too for its excellent standards of workmanship and professionalism. We have used you for a while now and have been very impressed with your high levels of service.

Sally Moran

Just wanted to thank you for the fantastic work that was done in our house. Both men were extremely polite and hardworking and did a brilliant job. We are also very grateful for you coming out much earlier in order for us to have heating again.

Excellent Service. Thank you so much.

Sarah Harper

I just want to pass on my thanks and appreciation for the work that you have recently provided help to get our boiler / heating back up and running in the hospice.

I'm sure that you're very busy but i really value how responsive you've been to help us.

We're really grateful to be working with you and I'm sure it's the start of a successful partnership.


I would like to say a huge thank you to the lady who took my call yesterday and managed to get someone to us in minutes. To say yesterday was stress would be an understatement. The plumber that arrived was so calm and collected and I just wanted to thank the company so much and apologise for my highly emotional state. No one ever expects to open their front door and be faced with that and especially so close to Christmas... on the day you are due to exchange on the house!

Thanks again and we will be recommending you to everyone!!!

Beca Griffiths

Can I please also pay a compliment to David for his outstanding work yesterday and thank you all for getting the heating working much sooner than I'd anticipated.

Jon Taylor

I wanted to say once again how helpful the two men were. They answered all my questions and were just very considerate.

I have been so pleased with your company and would highly recommend you.

Clare Hockings

I would like to thank you for the installation job last Thursday. Your men did a great job. Mine is not an easy property to work on or in and they were efficient and professional and very prompt in their timing of the work in spite of all.

They also did go above and beyond with details and did not treat me like a lamebrain civilian which made a change.

Judith Browne
Our credentials

We’re accredited

To ensure our customers receive a high standard of workmanship, experience is accredited and monitored by several trade industry bodies.