As winter approaches, households are turning their attention to central heating after months of inactivity. If radiators fail to warm a home properly, there is no need to panic immediately, as common issues can often be resolved without a professional.
Joe Horton, plumbing expert at Able Group, identified trapped air as one of the most frequent problems. He explained: "Trapped air prevents the hot water from circulating properly and leaves parts of the radiator cold, and another is debris and sludge gradually building up in the heating system, restricting water flow and affecting how efficiently the radiators heat up."
How to identify the problem
Basic radiator problems are often straightforward to resolve, and bleeding is the first step to try. Horton advised: "If your radiator isn't heating up correctly, don't automatically assume you need a replacement. Bleeding the radiator can help release trapped air, but if there are persistent cold spots or recurring problems, there might be a wider issue that a professional needs to investigate."
To determine whether bleeding is needed, check for warmth at the top and cold at the bottom, which indicates a build-up of sludge. Conversely, a radiator that is cold at the top but warm at the bottom most likely has trapped air inside.
Step-by-step bleeding guide
British Gas has provided straightforward steps for bleeding a radiator successfully. The task requires a radiator bleed key or a flat head screwdriver for more modern radiators, a cloth or old towel, and a container.
All radiators should be turned off and allowed to cool completely to avoid the risk of burning or scalding. Once the heating is off, locate the radiator valve and use the key or screwdriver to open it, turning anti-clockwise. For stiff or stubborn valves, the cloth can provide a better grip.
Open the valve gradually until a hissing sound is heard, indicating trapped air is escaping. Once the sound stops, water will begin to flow out and can be caught in the container. After the water or sludge has been released, tighten the valve back up and mop up any spillage.
