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Clean out heating

Joined
22 Jan 2009
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Hampshire
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United Kingdom
HI I want to flush my heating system,it has 7 rads over 2 floors, the boiler is sealed(no header tank) The rads are all cold at the bottom and hot at the top. How do I add an inhibitor when finished
 
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and a sealant gun via a rad vent :wink:
 
You will find it's easier to add the inhibitor when the system is drained down.
 
If there's an auto air vent somewhere on the system it may be possible to unscrew it, and use a miniature funnel to pour the inhibitor in.

The pourable inhibitors are cheaper than the injectable ones.

Don't unscrew the AAV in the boiler though.
 

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