Radiator cold at the top but hot at the bottom: what to do?
Radiator cold at the top but hot at the bottom: the right reflexes in a few simple steps.
Quick answer
4 steps — read this before anything else
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1
Turn off the heating and let it cool.
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2
Bleed the radiator with a radiator key.
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3
Hold a cloth to catch drips and reopen the valve.
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4
Recheck the boiler pressure afterwards.
Warning
Bleeding several radiators lowers system pressure — repressurize after.
When a radiator cold at the top but hot at the bottom happens, the first minutes matter. Follow these steps to act safely and without panic.
What to do right now
- Turn off the heating and let it cool.
- Bleed the radiator with a radiator key.
- Hold a cloth to catch drips and reopen the valve.
- Recheck the boiler pressure afterwards.
Mistakes to avoid
- Acting before removing the immediate source of danger.
- Panicking or skipping the official procedures.
- Following unverified advice from random websites.
How to prevent this in the future
Regular checks, keeping emergency numbers visible and preparing an essentials kit go a long way. Save this guide for offline access.
Frequently asked questions
What should I do first?
Ensure everyone is safe, remove the source of danger, then call the relevant number or begin the official procedure.
When should I call emergency services?
Whenever life, serious injury or fire is involved. When in doubt, call — dispatchers would rather check than miss an emergency.
Spotted an error? Report it — we correct factual mistakes promptly.