Even though spring and the promise of warmer weather are drawing nearer, we will still be counting on our central heating to keep us warm over the next few months. To guarantee the optimal performance of your central heating system and to prevent energy waste (and higher bills), it is essential that your heating pipes and radiators are not clogged up – build up of black sludge – or even blocked due to internal corrosion.
What are the symptoms of corrosion?
• Heating system very slow to warm up
• Radiators partially or fully cold
• Non-functioning thermostatic radiator valves (TRVs)
• Radiators requiring frequent bleeding
• Boiler noise increasing in frequency and intensity
• Central heating pump or motorised valve breakdown(s)
• Black water in the system.
Correcting and preventing the cause
A good quality chemical inhibitor will prevent internal scale and corrosion in your central heating system and radiators. The inhibitor also lubricates the pump, helping to increase its life.
Chez-Vous Property Services recommends that the concentration of inhibitor in your system is checked every 3 years. Remember that it is also essential to renew the inhibitor after every disconnection or replacement of system components, such as radiators, TRVs, pump, motorised valves, boiler, etc.
Unless your heating system has benefitted from sufficient corrosion inhibitor from the day it was installed, the system has, unfortunately, been deteriorating. Central heating systems which have had little or no inhibitor added will need to be cleaned and protected.
How to check whether your system has enough inhibitor?
Here is a way to do your own check. Use a jar with a screw lid and fill it with some water from your ‘feed and expansion tank’ (the smallest tank normally located in your loft). Add some steel or iron nails or screws to the jar and put the jar lid on tight. If the nails start to rust after a couple of weeks then there is not enough inhibitor in your system. If you have a combi-boiler (no tanks in the loft), then carry out the same procedure with some water from a radiator.

System cleansing, flushing and protecting
The objective of flushing and treating the central heating system is to remove scale, water suspended particles of sludge or rust. The process of flushing the system and adding an inhibitor takes several hours.
For older or poorly-maintained systems, it is highly recommended to initially add a de-scaling/sludge-removal chemical. This is left to circulate in the system for a minimum of two hours at operating temperature, but can be left for up to 4 weeks in particularly bad cases. This product lifts and disperses the sludge into the circulating water so that it can be properly removed when draining and then flushing the system. After cleaning the system in this way, it is filled with fresh water and protected from further corrosion using an inhibitor.
Benefits of protecting your central heating system with an inhibitor
• Extend system life
• More efficient central heating system
• Protect against corrosion and lime scale
• Prevent breakdown of heating system components (heating pump, motorised valves)
• Reduce maintenance and running costs and save on fuel bills
• Prevent cold spots in radiators
• Stop frequent bleeding of radiators
• Noise from boiler, pipes, radiators, etc. greatly reduced or eliminated.
If you would like more information about adding a corrosion inhibitor to your central heating system, or would like help with any other plumbing, heating and electrical issues or projects, then please call Chez-Vous Property Services to talk to a Berkshire plumber and electrician on 0118 9770215.
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