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I'd say it's within the 100-150mm between starting the system from cold to running. But as soon as heating is off it empties and starts filling.

Thanks for the reply. Sorry my description ain't that clear I'm not a plumber and not used to this type of system. Basically when heating is on i can hear what sounds like running water in the hot water cylinder. When I put the heating off the f/e tank then starts supplying water to the...

Hi, recently moved house and it has an open vented system with f/e tank in loft. Had an issue with the f/e tank overflowing with hot water and cold spots on rads. Drained system down and added sentinel X400, overflow seems to have stopped and radiators are becoming a bit better than they where...