"Timbrook99" wrote in message
om...
A member of our family has a very newly installed Glow Worm 30SXi
boiler which cuts out for no apparent reason. The local fitter has
called in Glow Worm since it is under warranty.
The Glow Worm person has ordered a new gas valve.
Rather surprisingly, the GW man declared that he'd seen similar
problems on three other boilers in the area and that he believed it
was being caused by an additive which BG were adding to the gas so as
to reduce leaks.

Questions:
Is this plausible?

I can't offhand imagine any gaseous additive which would be able to act as a
leak sealer but there again I aren't a chemist perhaps one of our regulars
can add something here?

Do BG dope the gas in this way?
If BG do this, why will a new valve be any better?

I've never met a problem which could be ascribed to a gas borne additive. I
have on very few occasions met with a fine powder being carried through a
gas pipe and which slowly clogged the fine strainer situated in the inlet
port of some gas valves. On two occasions this appeared to be a black
(oxide?) which "might" have come from the inside of a copper pipe. On
another which was in a large industrial (newish, 100mm steel gas pipe)
installation there was a pale powder which some wag said would be salt from
the North sea but which I would have thought more likely to be plaster or
similar which had got into the pipes accidentally or otherwise during the
construction phase of the job.

How reliable are Glow Worm's boilers, (I'm planning to instal a
30HXi)?


I'd say you had made a good choice there. I've installed a few and they have
been no trouble either to install or service as time went by.