On Thu, 22 Jun 2006 16:02:09 +0100, Dave Fawthrop
wrote:

On 22 Jun 2006 14:02:22 +0200, Chris Bacon wrote:

|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.

The operative word is *should*, I would not trust it.

The bubble(s) can collapse letting both primary and secondary circuits
mix. I would not trust one either.

Mark