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Chemical Inhibitors

Chemical Inhibitors for Central Heating Systems

Fernox, Sentinel Chemical Inhibitor & Additives by Fernox, Sentinel & others added to Central Heating Systems (  New and existing systems ) undertaken in the Peterborough & Cambridgeshire Area by energy efficiency qualified heating engineer and Gas Safe registered (previously corgi gas) engineer.
Be wary of engineers NOT Gas Safe registered performing "work" on boilers whilst working with central heating.

Do I need a Central Heating System Inhibitor ?

Untreated water in a wet central heating system will naturally corrode metal components.
Particles typically bond to the interior surfaces of components, often causing wear and premature failure of pumps and valves. The heavier types of debris can settle at points of low water flow causing blockages and upsetting the balance of the system, resulting in loss of boiler efficiency and system effectiveness.
An Inhibitor is a chemical mix that should be added to the central heating system ( new or existing ) to prevent corrosion and prolong the life of the system,
Adding corrosion inhibitor to new or existing centeral heating systems is vital, and a lack of corrosion inhibitor in a system invalidates warranties on boilers and systems.


An untreated system can exhibit a variety of symptoms such as radiator failure, boiler failure, loss of efficiency, boiler noise, black water when bleeding the system etc.


Any of the problems described can be attributed to a lack of initial cleansing and failure to add inhibitor when the system was new, or maintain the level of inhibitor after draining down a system.


Ensure that the system has been properly cleaned and adequately treated. A cleaning treatment may be applied first, in more severs cases the system may have to be powerflushed.


Have a professional apply Inhibitor to protect the system from corrosion and help prevent further radiator system and boiler components failure. Following treatment the customer is issued a certificate to confirm cleanliness within the system and that an appropriate rust inhibitor has been added.


After cleaning and protecting your heating system protect it by installing a Filter system.

Central Heating System Filter Video

Click here to go to the CENTRAL HEATING SYSTEM FILTERS page.




Contact Details

Professional service for adding central heating inhibitors & additives in the Peterborough & Cambridgeshire area.
Gas Safe Registered to work on boilers & Energy Efficiency Qualified.
Be wary of engineers NOT Gas Safe registered performing "work" on gas appliances -
whilst working on central heating systems.
  • free estimate
  • no callout charge
Simon Mason 
mobile - 07783146897
landline - 01733 755667
Gas Safe Register has now replaced Corgi Gas - the regulator for gas engineers