Radiators full of air can significantly reduce thermal comfort in our home and lead to unnecessary waste of energy. Fortunately, there is an easy way to fix this problem yourself without having to call a professional. We will explain step by step how to bleed the radiator and what to watch out for during this process.
How is the radiator vented?
The first step to successfully venting the radiator is proper preparation. Gather the necessary tools: a special air vent key or a flat screwdriver, a bowl for water and an absorbent cloth to protect the floor from possible stains. To make the whole process go smoothly, make sure the radiator is cold – venting is best done before the start of the heating season or after previously turning off the heating. Identify the breather, which is usually located at the top of the radiator, on the opposite side of the control valve.
Before proper venting, let’s set the thermostatic valve to the maximum value. This action will ensure free flow of water in the system and prevent further problems during operation. Using a breather wrench or screwdriver, carefully unscrew the breather valve, holding the bowl underneath in case of water leakage. In the first stage, you will hear a characteristic hissing sound, which means that the air is starting to leave the radiator. Wait patiently until the hissing stops and a steady stream of water flows from the vent. This is the key moment that indicates that the air has been completely removed from the radiator.
After the water flow has stabilized, carefully tighten the breather, being careful not to damage the threads – unnecessary tension can lead to leaks. Next, let’s check if the breather is working properly and if there are no leaks. Let’s return the thermostatic valve to its original setting and then repeat these steps for all radiators in the house that need venting.
What to watch out for when venting radiators?
It is very important to be careful and precise when venting radiators to avoid problems that could affect the operation of the heating system. If you find that the water is flowing under too high a pressure, is dirty or contains impurities, this could be a sign of a more serious problem in the heating system – in which case you should consider consulting a professional. A malfunctioning system can be caused by a build-up of deposits in the pipes or insufficient pressure in the system.
Another important aspect is the correct sequence of venting radiators, especially in multi-storey buildings. It is best to start this process with the radiators on the lowest floors and then gradually move to the units above them. This strategy allows for more efficient removal of air that naturally moves upward in the system. Remember to perform each stage of bleeding patiently and accurately, especially for more complex systems such as old cast iron radiators.
After completing the venting, you need to check the pressure in the heating system, which is especially true for systems with an individual boiler. Pressure naturally drops after venting, so you may need to top up the system pressure to the recommended level. Incorrect pressure causes uneven heating of radiators or malfunctions of the entire system. When you regularly check and maintain your heating system and vent it annually, you ensure its long-term effectiveness and reduce the risk of costly repairs.
How do you vent the radiator at home? Do one thing and save yourself from having to call a professional
