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Mend Blockage Heating Water

what is the easiest way to clear a blockage from a header tank?

Am trying to drain the system, but the water will not drain from the header tank and therefore the system is still full. There is obviously a blockage somewhere. How do I get it out?

m
October 2010
Heating, Home Heating SystemsBlockage Heating Water
it sounds like its blocked at the air seperator
the only way is to cut out if it is there

b
October 2010

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Header Tank Blockage: Easy Clearing Guide