How do I bleed my radiators?

How to Bleed Your Radiators

If your radiators have cold spots at the top, air is likely trapped inside. Bleeding releases this air and restores full heating.

Step-by-Step Guide

1. Turn on your heating - Let radiators warm up to identify which ones need bleeding (cold at top)
2. Turn off the heating - Wait 10-15 minutes for the system to cool slightly
3. Prepare towels - Place a cloth under the bleed valve to catch water
4. Insert radiator key - Turn anti-clockwise until you hear air hissing out
5. Close the valve - When water starts to dribble out, close the valve
6. Check boiler pressure - You may need to top up the system pressure to 1-1.5 bar

When to Call a Professional

If you need to bleed radiators frequently, there may be an underlying issue such as a leak or faulty expansion vessel. Contact NK Gas Services for a professional diagnosis.