Draining after flushing central heating system?

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23 Jan 2009
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Cheshire
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United Kingdom
I have a blockage in my system so I'm thinking of using a flushing agent. The bottle says to drain the system after flushing. The problem is my ground floor rads are each supplied individually from the 1st floor and don't all have drain cocks, so my question is this: If I drain the system from one of the ground floor rads will this clear the system sufficiently or do I have to drain each of the ground floor rads as well?
 
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You need to drain all of them I'm afraid. Might be worth considering changing your valves for ones with drainoffs incorporated in them while it's all drained down
 
You need to drain all of them I'm afraid. Might be worth considering changing your valves for ones with drainoffs incorporated in them while it's all drained down

I was afraid you were going to say that :cry: . Thanks for the help anyway.
 

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