"mm" wrote in message
...
On Fri, 12 May 2006 18:05:33 -0400, "HeatMan"
wrote:


"Edwin Pawlowski" wrote in message
et...

"Dyvim" wrote in message
There is no sight
glass on the boiler, which makes me think it is hot water, but I also
can't find any expansion tank, which makes me wonder (I've checked
all
closets, attic, etc. - where could it be hidden?). The psi on the
system is around 15, which also makes me think it is hot water (too

I really don't know: Is 15 the operating pressure or the maximum
possible pressure before it explodes?


Boilers are tested at (I think) 4 to 5 times operating pressure as the max
pressure. Otherwise Edwin is correct.