Low Heat or Cold Spots in Radiators
Cold spots in radiators are generally due to air within the radiator which needs to be bled out. This is a fairly simple job, requiring a special small key which is available from DIY stores. The key fits a valve on the top of the radiator, which is turned to release the air from within until water appears.
What the householder needs to think about is why is there air in the system?
In some cases, there may be a need to have a central heating system flushed by an expert to remove sludge like deposits. These deposits are made up of rust particles, carbon, plumbers flux, etc. which builds up over a period of time.
However, flushing can cause problems in old heating systems. It leads to leaks because the chemicals used dissolve deposits which are plugging tiny pin sized holes in the pipe joints.
Cold spots can be the result of air being drawn into the system though the central heating feed tank in the loft, because the valve has become jammed shut due to long periods of non use.
Radiators need to be balanced by a plumber to ensure that all the radiators give off the same amount of heat.
Remember, don't attempt plumbing repairs if you don't have the expertise or the correct tools. Call the professionals - Gifford Plumbing Services.