Chances are that the pinhole is a rust through. If you fix one you
will probably develop more soon.


On Sat, 18 Feb 2006 09:58:43 -0800, Grant Erwin
wrote:

I have a 10 year old hydronic heating system in my home. There is a boiler and
it leads to a special tank which holds the heated water, which is circulated on
demand through wall registers. The thing that makes this tank special is that it
also holds potable water, i.e. a hot water tank. The heating and potable water
never mix, ever.

My tank has developed a pinhole leak right up on the domed top. I cannot imagine
that there wasn't a manufacturing defect, but the warranty says that if the
house is sold the warranty ends at 5 years. Before I buy a new tank at a
whopping $1200, I want to at least try to fix the pinhole. My heating system guy
shook his head and said "it would never hold" but I don't see how I have much to
lose. There is almost certainly some kind of liner which I'd have to worry
about, so I'd want to use minimum heat.

Anyone have any idea how something like this might be patched? I was thinking of
trying a soft solder perhaps.

GWE
Gary Pewitt N9ZSV
Sturgeon's Law "Ninety per cent of everything is crap"