Welcome to CSO Heating LTD. Qualified heating engineers for homeowners, landlords and businesses in Swansea and South Wales.

We are an established, Swansea based firm of Domestic and Commercial Heating Engineers, servicing homes and businesses throughout the M4 corridor in South Wales.

A professionally managed, local business, we’ve built up a broad domestic and commercial client base over the years, simply by the consistent provision of high-quality workmanship and excellent customer service to all of our valued clients large and small.

Expert heating credentials

With expert, in-depth knowledge and relevant manufacturer training, we’re certified installers and servicing agents for boilers and ancillaries from all the major suppliers. Our service area covers both homes and businesses in South Wales such as the SA, CF, LD and NP post codes.

Heating services for landlords, commercial and domestic customers

Wherever you are in South Wales, whether a landlord, homeowner, or a commercial business owner/manager, you’ll receive the same professional, friendly service.


All aspects of domestic and commercial heating.

Natural Gas, LPG, Renewables and Oil powered heating.

Installation, fault finding and servicing of Boilers, Fires, Water Heaters, Cookers, Commercial Kitchens, Warm Air Heating, Under Floor Heating, Overhead Radiant and Tube Heaters.

Power Flushing and Fault-Finding Specialist.

No matter how large or small your central heating system we provide an expert service. Whether it’s for an emergency, annual service, upgrade or new installation, pick up the phone, email us or message us on social media to speak to an expert.

Some top brands we work with

Ariston Thermo GroupBAXIBoschDaikinFirebirdGlow WormGrant UKIdealMitsubishiNu-WayPowrmaticRemehaReznorRielloSamsungStrebelVaillantViessmannWarmflowWorcester Bosch Group

Domestic Heating

At CSO Heating LTD we offer an emergency 24/7 service so that if your heating breaks down at any time you can be assured we'll make it out to you to get your home warm again. All of our servicing and breakdown work is guaranteed.

Commercial Heating

In addition to being domestic heating specialists CSO Heating LTD also specialize in larger commercial premises. Any gas heating appliance over 70kw will need a specifically trained engineer to maintain it.

Renewable Energy Installer

The heating and energy business is changing fast, technology is moving away from fossil fuels and closer to renewable energies as we look for more environmentally friendly ways to heat our homes and businesses.

Safety Information

Can you smell gas? Feeling ill? Headaches... nausea... dizziness?

Badly fitted and poorly serviced gas/oil boilers, cookers and fires can cause gas leaks, fires, explosions and carbon monoxide poisoning.

In a gas emergency act quickly and take the following safety steps:

  • Get fresh air immediately. Open all doors and windows to ventilate the room 
  • Switch off the appliance and do not use it again until it has been checked by a Gas Safe registered engineer
  • Turn off the gas supply at the mains 
  • Call the National Gas Emergency number (see below)
  • If you are feeling ill visit your GP or the hospital immediately and tell them that your symptoms may be related to carbon monoxide poisoning
  • Contact a Gas Safe registered engineer to check and fix the appliance.

National Gas Emergency number: 0800 111 999

In an emergency we can be called out at all hours to take care of problems like these.
Phone our emergency call-out number: 07533 243290

Gas Safe RegisterOFTECSafe ContractorNICEIC Approved ContractorREFCOM F-GAS Certificated