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Bleeding Radiators

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Hi forum,

Can anyone tell me why my radiators need to be bleed every couple of weeks.  Especially the upstairs ones?
I don't understand why if it is a closed system where all this air is coming from.

Also, they sell two types of venting / bleed key in woodies.  One with a short metal lever, the other a butterfly shape.  See pic attached...
The short lever one is absolutely useless.  It completely bent after just a few uses.  The butterfly one is pretty good though.


Edited by BeeKeeper
wrong pic

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