Select symptom:
Cold spots on the top of the radiators
Cold Spots at the bottom of the radiator
It is likely the system is blocked, The radiators have become "sludged up" therefore heated water is unable to flow freely through the radiator. The efficiency of the unit is vastly decreased, the system will require a thorough Power flush.
Estimate price of job
Parts: £50
Time: £450
Total: £500*