How to bleed your radiators and boost heating efficiency

When cooler days approach, it is important that our radiators operate efficiently. Bleeding radiators are a key procedure that affects the home's heating quality. Air accumulating in the heating system can reduce radiator efficiency, leading to less thermal comfort in the rooms. Additionally, air-blocked radiators often emit annoying noises, such as gurgling or hissing.

Regular radiator bleeding also helps avoid costly repairs. Air in the heating system causes some parts to work harder, leading to faster wear and tear. Consequently, a well-maintained heating system is more efficient and less prone to malfunctions.

Air-blocked radiators can be caused by improper water filling, during which air enters the system. Air may often seep into the system through microcracks in the seals. Bubbles trapped in the tap water supplied to the heating system can also be a source of air.

It is advisable to prepare adequately before you start bleeding the radiator. For this task, you will need a flathead screwdriver, a container for water (e.g., a bowl or bottle), and a towel or cloth to protect the floor from contamination.

Bleeding a radiator is a relatively simple process. The first step is locating the bleed valve, usually at the top of the radiator. Then, place a container under the bleed valve to collect the escaping liquid. Gently unscrew the bleed valve screw using a screwdriver. At this point, air and water will start escaping–waiting until the water flows steadily out of the bleed valve is good.

When the air stops coming out, and the water flow stabilises, tighten the bleed valve screw and check the radiator for leaks. If, despite bleeding, the radiator still does not function properly, check whether the valves on the connecting pipes are open. Turning them a few times in both directions might unblock the water flow and improve the radiator's operation.

Sometimes, after bleeding, the radiator may be still cold. In such cases, it is worth checking the valves again and ensuring the bleeding was done properly. If the problem persists, it may be due to another heating system element, and consulting with a professional may be necessary. Leaky valves are a common issue. If the radiator leaks after bleeding, try tightening the connections again. In older systems, it is sometimes necessary to use gaskets or pipe tape to seal the threads.

Regular radiator bleeding is key to their longevity. It is worth performing this task at the beginning of the heating season and whenever you notice uneven heating or hear suspicious noises. Besides bleeding, radiators should also be cleaned regularly. Dust and dirt accumulation can affect heating efficiency. A soft cloth to clean the radiator’s surface helps keep it in good condition. To prevent the radiator from getting air-blocked again, it is also worth regularly checking the valve seals and tightening them if necessary.