If your radiators have a cold spot in the middle then they will probably need a Power Flush. Power Flush is an effective technique to keep your radiators working efficiently. Water and cleaning chemicals are pumped through your radiators at high pressure which flushes out any build-up and dirt that is causing a blockage.
By Power Flushing all your radiators, you will be making your central heating system more efficient which will save you money on your heating bills. It could also save you the time and potential money spent on central heating repairs.