Why are my radiators cold at the bottom?
- machala81
- May 12
- 1 min read
One of the most common causes is sludge build-up inside your radiators. Over time, rust, dirt, and debris can collect in your heating system and settle at the bottom of radiators, stopping heat from circulating properly.
Signs your system may have sludge build-up:
✔ Radiators cold at the bottom✔ Heating takes longer to warm up✔ Some rooms feel colder than others✔ Strange boiler or radiator noises✔ Higher heating bills
Can it be fixed?
In many cases, yes. Depending on the severity, your system may benefit from:
A heating system check
Radiator balancing
A chemical clean or powerflush
Installing or checking a magnetic filter
Keeping your heating system maintained can help improve efficiency, reduce energy costs, and keep your home warmer.
If you’ve noticed cold radiators or your heating isn’t performing as it should, our team at RF Henderson Heating, Plumbing are always happy to help.

📞 01670 735577🌐 rfhendersonheating.co.uk



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