Clean out heating

[hightrees]

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

 

[kevplumb]

and a sealant gun via a rad vent

 

[David937]

You will find it's easier to add the inhibitor when the system is drained down.

 

[mogget]

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.