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HI,HOPE SOMEONE CAN HELP WITH THIS.I HAVE HOT WATER COMING OUT OF THE OVERFLOW INTO THE EXPANTION TANK ALMOST AT THE RATE OF AN OPEN TAP.THIS SEEMS TO HAVE BEEN HAPPENING FOR A WHILE BECAUSE THERE SEEMS TO BE QUITE A BUILDUP OF SCALE AT THE END OF THE PIPE.I HAVE EMPTIED THE SYSTEM AND REFILLED...