A leaking radiator is usually more urgent than other radiator faults because it drops your heating system pressure and can damage flooring or carpets underneath. We repair leaking radiators across Cheam and Sutton, tracing the leak to its source, whether that is a valve, a joint, or the radiator body itself.
Leaks most commonly happen at the valve connections rather than the radiator body, which is good news since valve repairs are usually more straightforward than dealing with a corroded radiator. Older radiators can occasionally develop pinhole leaks through corrosion, which typically means replacement rather than repair.
If your boiler pressure keeps dropping alongside a leaking radiator, the two are connected, since the lost water is coming out of the sealed system somewhere.
Where radiator leaks usually occur
- The valve connections at either end of the radiator
- The gland packing within the valve itself
- Pipe joints feeding the radiator
- Pinhole corrosion through the radiator body (usually older radiators)
- The bleed valve at the top of the radiator
What an engineer checks
An engineer will dry the area and check each connection point in turn to find exactly where water is coming from, checking the valve gland, the joint nuts, and the radiator body itself for corrosion.
What you can do before we arrive
Placing a container under the leak and towels around the area will limit damage to flooring. If you can identify which valve is leaking and it is safe to do so, turning it fully closed can sometimes stop or reduce the leak, though this will also stop that radiator heating.
How charging works
Leaking radiator repairs are charged by time at our standard hourly rate, plus parts such as valve seals or a replacement valve. If the radiator itself needs replacing due to corrosion, we will quote for that separately. See /our-rates for current rates.
