A puddle of water around a radiator, or a damp patch on the wall or ceiling, is a sign that needs attention quickly. Leaking radiators can cause significant water damage if left, particularly to wooden floors and plaster. Here's a breakdown of the common causes and what you should do.
Common Causes of a Leaking Radiator
Leaking Valve (Most Common)
Radiator valves (the controls that regulate the flow of hot water into the radiator) are the most frequent source of leaks. The spindle packing inside the valve can degrade over time, allowing water to weep around the valve body. This is usually visible as dampness or a crusty white mineral deposit around the valve. In most cases, the valve needs replacing.
Leaking Radiator Connector
The threaded connections where the valve joins the radiator body or the pipe can leak if the thread sealant has degraded. This is a repair for a plumber: the radiator or valve needs to be removed and the connections resealed.
Pinhole Corrosion in the Radiator Body
Over time, internal corrosion (often accelerated by the wrong pH balance in the system water) creates pinholes in the radiator body itself. This typically appears as a persistent damp spot on the face of the radiator. A corroded radiator body usually needs replacing: repairs are rarely cost-effective.
Leaking at the Bleed Valve
The small bleed valve at the top corner of the radiator can leak if it's been over-tightened in the past and the seating is damaged, or if the rubber seal inside has perished. Often fixable with a new bleed valve insert.
What Can You Do Yourself?
If the leak is minor and at the valve, you can temporarily place a towel or tray under the radiator to catch drips while you arrange a repair. You can turn the valve clockwise to close it: this isolates the radiator from the system and may stop or slow the leak. Do not attempt to dismantle the valve or remove the radiator unless you're confident: you risk releasing more water or damaging the pipework.
When to Call a Plumber
Call a plumber when: the leak is active and not stopped by closing the valve; there's corrosion visible on the radiator body; the leak is at a pipe connection inside the wall; or the leak is causing ceiling damage below (indicating an upstairs radiator leak).
How Much Does Radiator Repair Cost in Liverpool?
Valve replacement on an accessible radiator is typically £80–£150 for parts and labour. Replacing a corroded radiator (fitting only, with the customer supplying the radiator) is typically £100–£200. Supply-and-fit of a new radiator is generally £150–£300 depending on size and access.
For radiator leaks and repairs across Liverpool, Merseyside and the Wirral, call Jimmy Taps on 07307 331103.