Why bleeding matters
Air trapped in a radiator prevents hot water from circulating, leaving the top cold and your boiler working overtime.
Kit
- Radiator key (or flat‑head screwdriver for modern valves)
- Old towel
- Small container or jug
Steps
- Turn the heating off. Let the system cool to avoid scalds.
- Locate the bleed valve (usually top corner).
- Insert key & twist anti‑clockwise one quarter‑turn. You’ll hear hissing.
- Catch drips once water begins to escape steadily.
- Close the valve, wipe, and check the boiler pressure (top up if below 1 bar).
- Turn heating back on and feel for even warmth.
Safety first
If you have a pressurised system or can’t find the filling loop, don’t guess – call a professional.
Energy savings
Bleeding restores efficiency; the Energy Saving Trust estimates a properly balanced system can shave up to £75/year off heating bills.
Pro help
Persistent cold spots, kettling noises or pressure drops could signal sludge or pump issues. NorrScot offers power‑flushing and system balancing for a toasty home throughout Aberdeen winters.
Quick FAQ
How often should I bleed radiators? Check every autumn and whenever you notice cold spots.
Do I start upstairs or downstairs? Begin with the lowest radiators and work upwards in a typical vented system.