Do you have a cold bottom or at least a radiator cold bottom?
Is the bottom of your radiator cold? We all take heating systems for granted and do not really bother to look after them until they go wrong. This his pretty much the case for most households and homeowners which is really strange as you use it everyday and rely on it not to go wrong for years at a time.
Hopefully times are changing with the real impetus by boiler and radiator manufacturers to enforce good practice when it comes to the looking after a heating system. The warranty of boilers and radiators is dependent upon what chemicals are used in the system to protect it, also with the huge growth of magnetic filters, like the Adey Magnaclean Micro Pro1, it does really make a difference to the longevity of your system.
Over the last few years the heating and hot water systems have changed considerably from large inefficient cast iron block boilers into highly efficient condensing boilers that need a much cleaner system.
The build up of sludge in a system that is created by oxidation of the steel and impurities in the system water and remnants of the installation processes have caused boilers to fail and systems to be really inefficient. It has been found that a build up of sludge and debris in the system, not only harms the boiler or pumps but also inhibits the output of the radiator or emitters.
It is a good thing to test on your own radiators and really easy to do as once the radiator is hot, just run your hand over the whole radiator seeing if there is a noticeable difference in temperature from top to bottom or in the middle.
A radiator cold bottom is more likely to be a build up of sludge in the system which will accumulate in the bottom of radiators as it is heavier than water.
If you have established cold spots which can actually resemble a gradual hill in the radiator you are going to need to take the rad off the wall and flush it through. You can also pay for a power flush from an installer which will greatly improve the efficiency of the system and reduce your heating bills.
If the radiator is not hot at the top then the problem is more than likely air in the system that can be bleed out by the vent at the top of the radiator.
So a simple easy check that you can perform cannot only save you money but may help you boiler not to breakdown. If you also do not have a magnetic boiler filter like the Adey Magnaclean filter then it may also be a good time to invest in a simple low cost product that can save a lot of hassle for the future.
Don't be caught out with a radiator cold bottom, keep your bottom warm!