Skip to content
DMK Plumbing and Heating, Cardiff

Boiler Repair, Servicing and Installation in Cardiff

Whether your boiler has stopped working, is due its annual service or needs replacing, our Gas Safe registered engineers can help — with a price agreed before any work starts.

  • Repairs on all major boiler brands
  • Annual servicing that protects your warranty
  • New boiler installations with a free survey
  • Clear fixed prices, no hidden call-out fees
07868 470 791
Newly installed wall-mounted gas boiler with copper pipework
Gas Safe Register approved engineersWhich? Trusted Traders endorsed memberCheckatrade approved member
9.923 Checkatrade reviews

Boiler playing up? Talk to a Gas Safe engineer now

Tell us the make, model and any fault code on the display and we will tell you what is likely wrong before we arrive.

07868 470 791

Common boiler faults we fix

  • No hot water or no heating at all
  • Boiler losing pressure or needing constant topping up
  • Leaking boiler or leaking pipework around it
  • Pilot light or ignition faults and lockouts
  • Fault codes on the display
  • Noisy boiler, kettling or banging pipes
  • Thermostat, diverter valve and pump faults

If your heating works but individual radiators stay cold, that is usually a heating system issue rather than the boiler — see central heating repair.

Worcester Bosch domestic gas boiler

Brands we work with

We repair, service and install all the major domestic brands, including Worcester Bosch, Vaillant, Ideal, Baxi and Glow-worm. If you are replacing a boiler we will recommend the right size and type for your home rather than the most expensive one on the shelf.

Choosing between combi, system and regular

A combi suits most flats and smaller homes: instant hot water and no tanks. A system or regular boiler with a cylinder makes more sense where several bathrooms are in use at once. We survey the property, check the water pressure and radiator sizes, then explain the options in plain English.

Ideal domestic gas combi boiler

Free Boiler Quote

Send us a few details about your property and we will come back with a clear fitted price. For breakdowns, please call instead — it is faster.

We use your details only to respond to your enquiry.

Questions

Frequently Asked Questions

Should I repair my boiler or replace it?

It depends on the age of the boiler, the cost of the parts and how reliable it has been. If a repair is sensible we will repair it. If you are throwing good money at an old boiler we will say so and quote for a replacement so you can compare.

How long does a new boiler installation take?

A straight swap in the same position is usually a one-day job. Moving the boiler, changing type or upgrading pipework can take two days. We will tell you before we start.

What happens during an annual boiler service?

We check the gas pressure and flow, test the flue for safe combustion, inspect seals and the heat exchanger, clean components as needed and check the safety controls. You get a clear summary of anything that needs attention.

Which boiler brands do you work on?

All the major domestic brands, including Worcester Bosch, Vaillant, Ideal, Baxi and Glow-worm, on both gas and LPG.

My boiler is showing a fault code — is that useful?

Very. Note the code down and tell us when you ring. It usually points to the fault, so we can bring the right part with us.

What customers say

Rated 9.9 on Checkatrade

From 23 verified customer reviews.

Checkatrade approved member
  • Brilliant service from a knowledgeable and friendly engineer. Highly recommended

    Ed Hutchinson · 28/05/2024

  • Fantastic service! arrived on time fixed our problem right away. I highly reccomend this company.

    Grant Wallett · 28/05/2024

  • Super quick response. Fixed an emergency water leak promptly and efficiently. Will definitely use again.

    Hasan R · 24/05/2024

Repair, service or replacement — call now and speak to a Gas Safe registered engineer in Cardiff.

07868 470 791
Call NowWhatsApp