"Chris Bacon" wrote in message
...
Dave Fawthrop wrote:
Chris Bacon wrote:
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?

Untrue. In the old old days people used primatic systems
http://www.rangecylinders.co.uk/prod...tic/index.html which had
only
one tank. The link indicates that they are still available and legal.
The
HW and CH circuits were kept separate by gravity.

Even with a primatic system there should be no connection
between the CH and the other side of things, so you're
wrong - unless you are claiming that mixing of CH water
with the rest is normal.

He is more right that you that is clear. Only two air bubbles separate the
CH and secondary fresh water.