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.