DIY Doctor

Adding corrosion inhibitor to pressurised central heating

Postby Letsrock » Wed Feb 09, 2011 10:00 am

Hi Folks

I need to add corrosion inhibitor to my pressured central heating system as otherwise I may have to er..hmmm, replace another heat exchanger in the boiler ahem!!

I guess 3 years ago when we had the whole system installed I figured I could get away with it...ouch £300 later!

So - given there's no header tank in this sucker, how the hell do I get the inhibitor in the system please?

Also how much do I use and which (make/manufacturer) is the best?

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Simply Build It

Postby stoneyboy » Wed Feb 09, 2011 9:47 pm

Product and instructions are here:
Google ""
In short you close the valves at both ends of a radiator, drain down some of the water in the radiator and inject the fernox through the bleed screw.
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