On Sun, 18 Sep 2005 12:04:59 +0100, a particular chimpanzee named "Set
Square" randomly hit the keyboard and produced:

I guess that it is probably a vented system - with a small fill & expansion
tank in the attic - and that it wasn't converted to a sealed system when the
new boiler was fitted. Is this correct? If so, is there any evidence of
pumping over - in other words, when the pump is running, is there a constant
flow of water out of the vent pipe back into the F&E tank?

Yes, it still has the header tank in the loft, but I don't know if
there has been any pumping over.

Apportionment of blame could be a bit of a challenge - because the boiler
manufacturer and installer will blame each other. Start with the installer -
the black water has *got* to be down to him due either to:
* insufficient flushing
* not putting inhibitor in, or
* incorrect system design

or some combination of these.

It seems the first and third are definitely there. Crawling round the
loft space yesterday, I found an empty 1 litre bottle of Sentinel (?)
inhibitor. Assuming they put the full bottle in and no more, is this
enough for a seven radiator system?

I'm not hopeful of getting a response from the installer. He's got
his money, and wouldn't respond to my concerns about the system last
year. Short of throwing good money after bad to hire solicitors, etc
to get him to put things right, what options do I have?
--
Hugo Nebula
"If no-one on the internet wants a piece of this,
just how far from the pack have you strayed?"