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How do you put corrosion inhibitor into pressurised (Combi) CH systems?

The title says it all. My top radiator seem to gather a bit of air, so it made me wonder if the system had any corrosion inhibitor in. Not been in house long so dont know.

Is there some system to pump in via a rad bleed screw?

Steve
December 2006
Heating, Home Heating SystemsPut Combi Ch
Thanks for both your answers - think I'll investigate the bleed valve route first!

Steve
December 2006
you can get the tube and connector from plumbcentre and most heating merchants and you inject it into the bleed valve on the radiator.

hi-spec plumbing
December 2006
Take a radiator off the wall and pour the inhibitor in. Be careful when rehanging the radiator.

mark
December 2006

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Combi Boiler Corrosion Inhibitor - How to Add