We provide professional radiator services in London including installation, repair, and replacement across all 33 boroughs. Whether you have a cold radiator, a persistent leak, a noisy system, or you’re upgrading your entire heating setup, our Gas Safe engineers diagnose the problem correctly and fix it right first time — at a fixed price, with a 12-month workmanship guarantee on every job.
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Radiators installed
and repaired in London
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London boroughs
covered every day
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Most radiator problems have a straightforward fix — but the wrong diagnosis wastes money. Our engineers identify the root cause before recommending any work. Here are the eight most common issues we attend across London.
Air trapped in the radiator prevents hot water circulating to the top section. The fix is straightforward bleeding — our engineer releases the trapped air and checks system pressure.
When some rooms are hot and others stay cold, the heating system is likely out of balance. System balancing — adjusting flow rates to each radiator — restores even heat distribution throughout the property.
Cold spots at the bottom typically indicate sludge or debris build-up restricting hot water flow. Power flushing clears the blockage and restores full heat output across the panel.
A stuck or failed thermostatic radiator valve (TRV) can prevent a radiator from heating or cause it to stay on permanently. We test, free or replace the valve — usually a quick fix.
Leaks most commonly occur at the valve, the bleed point, or at a pinhole in the panel itself. We identify the exact source before advising on repair or replacement — never guess-and-replace.
Sludge build-up inside an ageing system forces the boiler to work harder for less heat. A power flush removes years of debris and can significantly reduce energy consumption and heating bills.
Banging, clicking or gurgling sounds can indicate trapped air, water hammer, or a failing pump. Our engineer diagnoses the source and resolves it — without unnecessary parts replacement.
If multiple radiators are failing simultaneously, the problem often lies with the boiler, pump, or central heating controls rather than the radiators themselves. We diagnose across the full system.
→ Boiler problem suspected? See our Boiler Repair service
→ Full system issue? See our Central Heating Services
Not sure whether your radiator needs fixing, replacing, or whether you’re adding a new one entirely? Here’s a straightforward guide — though our engineer will always confirm the right course of action at no charge before any work begins.
Repair
Repair is almost always the right first option — and usually the most cost-effective. Most radiator faults are caused by trapped air, a stuck valve, or minor corrosion at a fitting, all of which can be resolved quickly without replacing the radiator itself.
Replace
Replacement makes more sense when the radiator itself is the source of the problem — typically through corrosion of the panel, persistent pinhole leaks, or when efficiency has dropped significantly. Modern radiators are considerably more efficient than older models, and upgrading to a designer or low-surface-temperature radiator can also improve safety and room aesthetics.
Install new
Adding a new radiator to an existing central heating system is a straightforward job for our engineers — whether you’re heating a previously unheated room, extending into a converted space, or adding a heated towel rail in a bathroom. We also install radiators as part of loft conversions, extensions, and renovation projects, and carry out full system balancing after every new installation.
Not sure which applies to your situation? Our engineer will assess your radiator at no charge and give you an honest recommendation before any work is agreed.
Radiator costs vary depending on the type of job, number of radiators, and whether additional system work is required. Simple repairs are fixed-price jobs confirmed before we start. New installations and power flushing are quoted after a brief assessment. All prices below are for standard London properties.
Replace faulty thermostatic or lockshield valve
45–90 min
Remove old, supply and fit new radiator — like-for-like
2–3 hrs
Add a radiator to an existing system, including pipework
2–4 hrs
Optimise flow to all radiators for even heat distribution
2–3 hrs
Replace all radiators — price depends on property size
1–3 days
All prices for standard single-radiator jobs are confirmed before any work begins — no call-out charge, no hidden extras. Power flushing and full system replacements are quoted after a brief assessment, as cost depends on system size and condition. 12-month workmanship guarantee included on all jobs. Radiator cost London queries: prices shown are for standard London properties.
Four clear steps — from diagnosis to a fully tested, balanced heating system.
Your plumber identifies the nearest suitable cold water supply pipe, assesses the wall for the best tap position, and checks the pipe run length. The fixed price is confirmed on this basis before any drilling or connections are made.
Fixed price confirmed first
A single clean hole is drilled through the external wall at the agreed position. The pipe is fed through and the tap backplate is fixed securely to the external face of the wall. The wall penetration is sealed with exterior silicone.
Single hole · Silicone sealed
A tee connection is made into the nearest cold water supply pipe inside the property. The supply line is run neatly to the wall and connected to the tap. An isolation valve is fitted on the internal supply run for winter isolation.
Isolation valve included
Water is turned on and the full installation is tested — checking for leaks at every connection point, correct water flow, and tap operation. Your 12-month guarantee is provided in writing and the tap is ready to use immediately.
Ready same day · Guaranteed
Our engineers specialise in heating systems — not generalist plumbing. With over 15 years of radiator installation and repair work across London, we diagnose problems correctly the first time and avoid unnecessary parts replacement or return visits.
After every radiator installation or replacement, we re-balance the heating system to ensure every radiator in the property receives the correct flow rate. Many engineers skip this step — leaving customers with one very hot room and several cold ones.
New radiator installations are sized correctly for the room — not just swapped like-for-like without assessment. We calculate the correct heat output required and recommend the right radiator type and size for the space, ensuring maximum efficiency from day one.
We only fit radiators and valves from reputable manufacturers — no low-grade components that fail within a year. Every replacement part and new radiator is sourced for longevity, not lowest cost. We stand behind our recommendations with our 12-month guarantee.
The majority of radiator repairs — bleeding, valve replacement, minor leak repair — are completed on the same day you call. We carry the most common replacement parts on every van so there are no unnecessary return visits while waiting for parts to arrive.
Your engineer confirms the exact price before any work begins. There is no call-out charge, no mark-up on parts that we don't disclose, and no surprise extras on the invoice. What we quote is what you pay — every time, with no exceptions.
Read all reviews on Trustpilot →
“Three radiators in our Victorian terrace had been cold at the bottom for years — we’d been told it would need a full power flush. The engineer came, diagnosed a sludge build-up in two of the three, power flushed the system and balanced it properly. Heating is now consistent throughout the whole house for the first time in years. Brilliant job.”
“Called about a leaking radiator in the bedroom — the engineer arrived the same afternoon, identified the leak was coming from the bleed valve rather than the panel itself, and fixed it in under an hour. He also noticed the TRV was sticking on two other radiators and replaced both while he was there. Fixed price, no mess, job done.”
“We had a new radiator installed in our loft conversion — the engineer measured up correctly, recommended the right output for the room size, and fitted it neatly with minimal disruption. He balanced the whole system before leaving and the new room heats up as quickly as the rest of the house. Exactly what you want — professional and no fuss.”
Get a fixed-price quote today. No call-out charge. Same-day availability across all 33 London boroughs.
Get a fixed-price quote today. No call-out charge. Same-day availability across all 33 London boroughs.
020 1234 5678
Local Gas Safe engineers covering all 33 London boroughs — same
fixed prices, same 60-minute response guarantee.
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Full central heating installation, upgrades and system replacement across London
Gas Safe diagnosis and repair — if the boiler is the source of your heating problem
Non-invasive trace and locate for hidden leaks in pipes, floors and walls
Burst pipe, split pipe and damaged pipework repair — same-day across London
Whether you need a quick repair, a full radiator replacement, or a new installation — our specialist heating engineers are available across all 33 London boroughs. Fixed prices, no call-out charge, same-day availability. Get a quote today and have your heating back to full efficiency.
