HI Tim

On Sun, 25 Mar 2007 09:55:48 +0100, Tim Lamb
wrote:

In message , Adrian
writes

I have something similar but not Ariston. I suspect these are imports
from a country with rather different rules on plumbing installation.

Do you mean that the Ariston is from a country with different plumbing
regs ?

Mine came from Screwfix!

g



IME anything with more than one language on the instructions is likely
to be an import.

Certainly - looks as if the 'native' langauge for this piece of kit is
Italian...


I spoke to one UK manufacturer (forgotten who now) in an attempt to
establish why it was necessary for the feed to be from the cold supply
and failed to get a clear explanation. The obvious issue is the risk of
a local *shut off* valve leading to over pressure. ISTM a thermostat
failure is more likely, where putting hot water/steam back into the
mains supply system ought to be less attractive than into a vented hot
water cistern. Oh well! None of this is relevant to your borehole set
up.

True !
The only reservation I have is that my deep borehole feeds a pressure
tank to provide the initial water feed before the pump cuts in. Quite
how this pressure vessel would feel about having 8 bar pushed back up
its outlet (!) I do not know.....

....but then, I'm not sure how a conventional mains supply would react
either. I guess in either case the condition only applies until the
pressure release valve blows - which, if the tank's decided to boil
due to a stuck 'stat, will not be for very long....

Complicated, innit ?? g

Still waiting to see what Ariston's Irish tech support people have to
say (probably along the lines of 'Shure - you don't want to be
worryin' about that now.....' g

Regards
Adrian


regards