Heating systems · Homeowner answer
How do I bleed a radiator?
Short answer
Turn the heating off and let it cool, open the bleed valve at the top corner with a radiator key until air stops and water appears, close it, then check the boiler pressure and top up if needed.
What changes the answer
- whether the system is sealed (pressure gauge) or tank-fed
- how much air is in the system
What you can check yourself
- have a cloth ready
- check the boiler pressure afterwards
What to do next
If radiators need bleeding often, air is getting in somewhere — that is worth a look.
This page gives general information only. Christy needs to see your system — in person or from your photos — before he can give you firm advice or a price.