Pex and solar panels - Page 2

 Really? Can you explain why you would say this? I thought copper was rated for
significantly higher pressure/temperature operation.

Bob

  Copper pressure limits ....maybe you should explain why a glycol/water
solution in a solar panel would be any where near 250 PSI for K grade used
in refrigation or 200 PSI for
for the softer copper used to pipe in icemaker or similar water piping.When
a 100psi is 388F on pure water
and higher when you add in glycol.Steamers,heating/AC
engineers/installers,and mechanics might wonder more about the PEX melting
at 250F and about 20 PSI roughly depending on glycol %.
In otherwords when the copper is dieing what is the story much earlier on
the PEX.
If the guy was using ammonia instead of glycol I would worry.But he is
not.....

 I think Arnold is right.
In fact PEX is NOT allowed in solar panels in this country.
The typical stagnation temp of a solar panel is close to 200 deg C (350 deg
F) and that is above the max temperature for PEX.
As piping you may use copper, black iron or stainless steel.
You may not use galvanized pipe in combination with glycol.
regards Niels

 just run several 2" pvc pipes in the roughed in walls and cap them.
when time comes to install sytem you just run the insulated copper
pipes right down the pvc, that's what  I did 6 years ago when I built
and 2 years ago installed my system