Central Heating & Radiator Services in Croydon & South London

A well-functioning central heating system is essential for keeping your home warm and your energy bills under control. DCN ServTech provides complete central heating services across Croydon and South London — from installing a brand-new heating system to replacing a single radiator or diagnosing why one room won't heat up properly. All gas-related heating work is carried out by our Gas Safe registered engineers, ensuring full compliance and safety on every job.

Central Heating Installation

Whether you’re converting from electric heating to gas, extending your system to a new extension or loft conversion, or installing central heating in a property for the first time, our team designs and installs full central heating systems tailored to your home.
Our central heating installation service includes:

  • Full system design based on your property’s heat requirements
  • Boiler selection and installation (see our boiler installation page for more detail)
  • Pipework installation throughout the property
  • Radiator selection, positioning, and fitting
  • Thermostatic radiator valves (TRVs) on all radiators
  • Smart thermostat installation and configuration (Nest, Hive, and others)
  • System commissioning, testing, and balancing
  • Full handover with operating instructions

Radiator Installation & Replacement

Old, inefficient, or undersized radiators can leave rooms cold and waste energy. We supply and fit a wide range of modern radiators to suit every room and style:

  • Panel radiators — the most common and cost-effective option for bedrooms and living areas
  • Column radiators — a classic look that works well in period properties
  • Towel radiators — heated towel rails for bathrooms and en-suites
  • Designer radiators — vertical, horizontal, and feature radiators for modern interiors
  • Low surface temperature (LST) radiators — safe options for nurseries, care homes, and schools

We also handle adding radiators to existing systems — for example, heating a new conservatory, loft conversion, or garage conversion.

Central Heating Repairs & Maintenance

If your heating system isn’t performing as it should, our engineers can diagnose and fix the problem. Common central heating issues we resolve include:

  • Radiators cold at the top (trapped air — bleeding required)
  • Radiators cold at the bottom (sludge buildup — powerflush recommended)
  • One or more radiators not heating up at all
  • Boiler firing but radiators staying cold
  • Uneven heating across different rooms
  • Noisy pipes or radiators (banging, ticking, or gurgling)
  • Thermostat not controlling the heating properly
  • Motorised valve faults and zone control issues

Power Flushing

Over time, central heating systems build up sludge, rust, and debris that block pipes and radiators, reducing efficiency and increasing energy bills. A powerflush clears the entire system using high-flow, low-pressure water combined with specialist cleaning chemicals.
Signs you might need a powerflush:

  • Radiators with cold spots, especially at the bottom
  • Boiler making banging or kettling noises
  • Heating takes a long time to warm up
  • Discoloured water when you bleed radiators
  • Some radiators much hotter than others
  • Boiler frequently cutting out or locking out

A powerflush can significantly improve your heating efficiency and extend the life of your boiler and radiators.

Areas We Cover

Croydon, Bromley, Thornton Heath, Norbury, Crystal Palace, Streatham, Brixton, Mitcham, Lewisham, Penge, Beckenham, South Norwood, Sydenham, Dulwich, Catford, and all surrounding areas.

Areas We Cover

How much does it cost to install a new radiator?

A straightforward radiator replacement on an existing system typically costs between £150–£300 including the radiator, valves, and labour. Adding a radiator to a new location (requiring new pipework) will cost more depending on accessibility and pipe runs. We provide exact quotes after assessing the job.

What is a powerflush and do I need one?

A powerflush is a deep clean of your central heating system that removes sludge, rust, and debris from pipes and radiators. It's recommended if you have cold spots on radiators, your boiler is noisy, or your heating takes a long time to warm up. A standard powerflush for a 3-bedroom house typically takes 4–6 hours.

Can you add radiators to my existing system?

Yes. We regularly add radiators for loft conversions, extensions, conservatories, and rooms that were previously unheated. We'll check your boiler has sufficient capacity and advise on the best radiator type and position.

Do you install smart thermostats?

Yes. We install and configure Nest, Hive, Tado, and other smart thermostats as part of a central heating installation or as a standalone upgrade. Smart thermostats can help reduce your energy bills by giving you more precise control over your heating schedule.

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Best Gas Engineer in Croydon & South London

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