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need to now how to top up rad water system on mason marathon 600b?

heating system air locked and needing water top up but not sure wear valve is sited
len brown, July 2007
you will probably have a header tank with that boiler. small tank located usually in the attic. I DONT KNOW WHY PEOPLE WONT JUST GET AN ENGINEER IF THAY DONT KNOW HOW TO FIX IT, LEAVE IT ALONE.

BG ENGINEER, July 2007