Central Heating Radiator Repair, Replacement & Installation in South London

Radiator maintenance, installation and repair services in Lambeth and across South London, carried out by trusted Gas Safe registered engineers.
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Sean Apap Mangion profile picture
Sean Apap Mangion
22 February 2026
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Have used them twice now, once to disconnect/relocate radiators and another time to relocate the boiler. In both cases the team managing things have been very professional, quick but thorough, and clear re what was to be done. Particular thanks to James, Ronan, and Nick. Prices are fair for good quality work and service, will definitely reach out again for any other jobs.
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Nicholas Wells Antiques
19 February 2026
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Very happy with Aren Heating & Plumbing servicing our wet underfloor heating. Excellent
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Adam Williams profile picture
Adam Williams
13 February 2026
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The team at Aren are consistently professional, responsive, polite and well priced.
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Daniel Otto Kellett
5 February 2026
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An excellent UFH service, good value, quick appointment and gave me some really useful advice. I’ll definitely be using them again. Thanks !!
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Nikolas Holttum
28 January 2026
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Aren were terrific. They really knew their stuff. They carried out a thorough diagnosis of our boiler problems and eventually recommended a replacement. All the team were punctual and super professional. Highly recommended.
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Courntey bailey
23 January 2026
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We have been using Aren Properly Services since 2022, and always receive amazing care when doing our boiler services, or any remedial works. They always go above and beyond and never try to rip you off like a lot of contractors out there. Highly recommend
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Timur Sanerkin profile picture
Timur Sanerkin
21 January 2026
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First class service
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Emily C profile picture
Emily C
21 January 2026
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Quick and professional service. Fixed my heating and clearly explained the problem and fix.
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Thomas Goode profile picture
Thomas Goode
13 January 2026
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I had an issue with my HIU. I was able to quickly arrange a booking with Aren. Their onsite engineer was polite, friendly and punctual. He fixed the problem quickly and gave me some basic advice on what to look out for to help troubleshoot future problems. I would highly recommend Aren Heating and Plumbing.
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Duncan K profile picture
Duncan K
12 January 2026
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Quick, clean and efficient. Very pleased and will be using Aren again. Ronan (the plumber) worked hard and fast to finish job inside 1 hour which kept the cost down for me, when he could have easily relaxed and stretched it out. Thanks!

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Radiator Repair, Replacement & Installation in South London

Is your radiator not working, leaking or failing to heat up properly? Need help installing a new radiator before the colder months arrive? At Aren Heating and Plumbing, we’re here to help with reliable radiator repair, replacement, installation and maintenance services across Lambeth and South London.

Our Gas Safe registered engineers provide a complete central heating radiator service for homes, landlords and commercial properties. Whether you need to fix a broken radiator, install a more efficient model or arrange annual radiator maintenance, we’re the local experts you can trust.

We diagnose radiator faults carefully, explain the issue clearly and carry out the right repair wherever possible. If a replacement is the better option, we’ll advise you honestly and install your new radiator safely, with the system tested before we leave.

Radiator Repairs

When your radiators are working properly, you probably won’t pay them much attention. But when they stop heating up, make strange noises, leak or leave your home or office feeling cold, you’ll want the problem fixed quickly.

Whether your radiator is not heating up properly, you’re hearing banging or gurgling noises, or you’ve got a leaking radiator, these are all signs that something is not right. Call us to check it out, identify the cause and get it fixed.

We repair domestic and commercial radiators across South London. We’ll send a professional and experienced engineer to inspect the radiator, diagnose the problem and complete the repair where possible. We’ll also run checks to make sure your heating system is working properly before we leave.

Common radiator repairs include fixing leaks, replacing faulty valves, bleeding radiators, balancing heating systems and dealing with cold spots caused by trapped air or sludge.

Radiator Installation

Your existing radiator might be too old, inefficient, damaged or simply no longer right for the room. Whatever your reason, we can replace your radiator and install a new one quickly, safely and professionally.

We’ll send an experienced engineer who will carry out the necessary preparation, including draining the system where required. They will then install your new radiator, reconnect it correctly and test the system to make sure it is working properly with no leaks.

We can also provide advice on choosing a new radiator, helping you find an efficient and cost-effective model that suits your room size, heating needs and property style.

If you’re upgrading a room, replacing an old radiator or improving heat output, we can help with single radiator installations, multiple radiator replacements and central heating radiator upgrades.

Radiator Servicing

Annual radiator servicing is a great idea if you want to keep your radiators in good condition and ensure they are working as efficiently as possible. It also helps spot problems early, reducing the chance of needing urgent radiator repair or replacement later on.

Servicing can help make sure your radiators are heating evenly, your system is running efficiently and you’re not wasting money on energy bills. It can also help your radiators last longer.

We recommend combining your radiator servicing with your annual boiler check, especially before autumn and winter when your heating system is used most.

During a radiator service, we can check for leaks, cold spots, trapped air, valve issues, signs of sludge build-up and any problems that could affect the performance of your central heating system.

FAQ

Why is my radiator cold at the bottom?

If the bottom of your radiator is cold, it’s possible that there is a debris obstruction preventing hot water from reaching the entire radiator. Usually, sludge, debris, rust, and other dirt particles are to blame for this particular issue.

Why is one radiator cold when the heating is on?

One cold radiator typically means that the radiator has a jammed valve or that there is air in the system.

Why are my downstairs radiators cold?

The downstairs radiators being cold can indicate a balance problem. Because hot water rises in a heating system, if the radiators on the first floor are cool but the ones on the second floor are warm, you have a balancing issue.

Why are my upstairs radiators cold?

Your feed and expansion tank in your loft has likely run empty if your home’s upstairs radiators are cold. This typically denotes a more serious issue. However, it’s also conceivable that the tank’s ball valve is malfunctioning; it could be obstructed or stuck.

Why is the top of the radiator cold?

It’s likely that air is trapped in the system if the top of your radiator is cold. By releasing any trapped air, bleeding the radiator will significantly increase the effectiveness of your complete heating system.

Why is the middle of the radiator cold?

If the bottom of your radiator is partially blocked by dirt or sludge and the centre of the radiator is cold, this could be the cause.

We Can Fix All Your Radiator Problems

There are many issues you might face with your radiators, and our experts can help with all of them. Here are some of the most common radiator problems we fix across Lambeth and South London.

Trapped Air

Is your radiator warm at the bottom but cold at the top? Does it stay cold even after the heating is turned on? You might need our radiator bleeding service to release trapped air from the system.

We can do this quickly and efficiently to help your radiator heat the room properly again.

Trapped air can also make your heating system noisy or leave some radiators colder than others. If bleeding the radiator does not solve the issue, we can investigate further and check whether there is a wider central heating problem.

Leaking Radiators

A radiator leak can often be fixed, but sometimes it can be more serious. We will investigate the source of the leak and let you know whether a repair or replacement is the best option.

If the leak comes from a valve, pipe connection or small fitting issue, we may be able to repair it. If the leak comes from a hole in the radiator itself, the radiator may need to be replaced.

It’s best not to ignore a leaking radiator, as even a small leak can cause water damage, reduce heating performance and put extra pressure on your central heating system.

Blocked Radiators

With the build-up of debris, sludge and rust, radiators can become less efficient and may stop heating evenly. If your radiator has cold spots, takes a long time to warm up or makes pipe noise, a blockage may be the cause.

Radiator power flushing or a central heating system flush may be the solution, and our experienced engineers will be happy to help. With the right radiator flush, you can improve heat output and reduce pipe noise at the same time.

We can inspect your system and advise whether radiator bleeding, balancing, chemical flushing or another repair is the most suitable option.

Gas & Landlord Safety Certificates

Estate agents and landlords regularly request our services for gas safety certificates and survey reports.

We provide a fast, professional and safe service so you can get your certificates and reports arranged with minimum fuss.

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Why choose aren?

For almost twenty years, we have been satisfying the needs of customers in Lambeth and South London with the exceptional quality of our plumbing services. Our clients continue to work with us because they are aware that we deliver a high-quality service and that we prioritise meeting their requirements at all times.

Not only do we have a great deal of expertise and years of experience, but we also pride ourselves on our professionalism and friendliness. Get in touch with us the next time you have an issue with your plumbing or heating that needs to be resolved, and we will send over one of our professionals to have a look at it.

Areas we cover

We cover these South London boroughs