Central Heating Systems
Heating System Leak Repair
Heating system leak repair finds the cause of pressure loss or water leaks in your central heating, then repairs or replaces the faulty part so the system can run safely and reliably again. It helps prevent repeat boiler lockouts, damp damage, and uneven heating by restoring stable pressure and proper circulation.
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What heating system leak repair covers
Heating leaks can come from visible components or hidden pipework. The aim is to locate the source, carry out a lasting repair, then recommission the system so it heats properly.
- Diagnosis of pressure loss and visible leaks on the heating circuit
- Repairs to pipework joints, damaged sections of pipe, and accessible fittings
- Replacement of common leaking parts such as radiator valves, bleed valves and connectors
- Checks of pumps, zone valves and other distribution-side components for signs of leakage
- Draining down and refilling the system where required
- Re-pressurising, bleeding radiators, and confirming stable operating pressure
- Final leak checks and functional checks of heating circulation
When this service is most relevant
Book a heating leak repair if you notice any of the following:
- Boiler pressure keeps dropping and needs topping up
- Damp patches, staining, or puddling near radiators or pipe runs
- Green or white staining around fittings, valves, or joints
- Noisy radiators or gurgling alongside pressure issues
- Boiler lockouts linked to low pressure
- Hot spots or poor circulation caused by air entering the system
How the repair is carried out
The visit typically starts with a few targeted checks to narrow down the cause, followed by the most suitable repair option.
- Visual inspection of radiators, valves, accessible pipework and connections
- Pressure checks and observation to confirm the type and rate of loss
- Isolating and making safe the affected section, then repairing or replacing components
- Refilling, bleeding, and testing the system under normal operating conditions
If the leak appears to be under floors or within boxed-in pipework, you will be advised on access options before any intrusive work begins.
After the repair: keeping the system stable
Once the leak is resolved, you should have a system that holds pressure and heats consistently.
- You will be shown what to monitor (pressure gauge behaviour and any return of damp)
- If the system has been drained, you may be advised on inhibitor levels to help reduce internal corrosion
- If there are signs of wider issues, you will be told what the next practical step is, without unnecessary work
Frequently Asked Questions
How do I know if my heating system is leaking or just losing pressure?
Regular pressure drops often indicate a leak somewhere on the heating circuit, especially if you need to top up frequently. A leak may be visible at radiators, valves, or pipe joints, but it can also be hidden. A proper check confirms whether it is a leak or another fault affecting pressure.
Can you repair leaks on radiators and radiator valves?
Yes, leaks around radiators are commonly caused by valve glands, connectors, or bleed valves. These can often be repaired or the part replaced to stop the leak. The system is then refilled, bled, and tested to confirm it holds pressure.
Will the system need to be drained down to fix the leak?
Sometimes, yes, especially if a valve, section of pipework, or a component needs replacing. Where possible, the affected area may be isolated to reduce disruption, but it depends on your system layout. After any drain-down, the system is refilled and checked for stable pressure.
What if the leak is under the floor or behind a wall?
If the leak is not visible, initial checks will focus on narrowing down the likely area and confirming the fault. You will be advised on the least disruptive access options before any lifting of boards or opening boxing is done. The next steps will be explained clearly so you can make an informed decision.
Is it safe to keep using the heating if the pressure keeps dropping?
It is best to treat repeated pressure loss as a fault that needs attention. Low pressure can cause boiler lockouts and, if topped up repeatedly, can introduce fresh water that increases corrosion risk over time. Arrange a repair to prevent damage and restore reliable heating.
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