Most cold spots on the bottom of radiators are caused by rust this can be reduced with continued maintenance by keeping your radiators vented and by putting special chemicals in the central heating side of your system.
A Magnaclean can be installed – this pulls out any rust in the system continuously. Each year when the boiler is serviced the engineer will then clean the magnaclean out. Thus it is constantly cleaning the system.
The system can also be power flushed. Harsh chemicals are added to the system then the radiators vibrated loosening lots of the rust. This process is then done to each of the radiators in turn until all of the floating debris has been removed.
This will remove the worst of it but if systems have been left in a poor condition for a number of years it will not clear out all the cold spots.
Please phone us for any queries or help on anything on 0208 150 7575.