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wrote:
While fitting a new radiator at friends house disovered there is
only one tank. So obviously any inhibitor added to the system could be
drawn off bit by bit via expansion into the hot water cylnder.Should
I either leave the system un-dosed (as it always has been) fit a
separate expansion tank ,theres easy access and plenty of room. Bearing
in mind the crud in most headers its unlikely anyone would drink from a
hot tap...but I think a mixer of crud and inhibitor would be Very
bad thing indeed. Ta, everyone

There should be absolutely no connection between the CH and
the other side of things. Are you sure of your facts?