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I have been advised to powerflush my 10mm central heating microbore pipes I had a little problem with radiators occasionally not getting warm downstairs , or cold at the bottom and warm at the top etc , A couple of times the downstairs were all cold until I switched the upstairs ones off and...

I am looking to drain my central heating system down but i have no drain valves on any of my downstairs radiators . There i s a drain valve at the bottom of my boiler in the garage . A plumber came round and said i would need a drain valve on all my radiators downstairs to completely drain...