temp settings for pex etc

Brad White

Typically, the actual standards and limitations should be printed right on the tube according to DIN and ASTM standards.

"It is rated at 73.4° F at 160 psi, 180° F at 100 psi and 200 °F at 80 psi" is from the Wirsbo Web Site.

You can see how the lower the temperature the greater the pressure it can withstand. My only concern would be expansion. Personally, PEX-AL-PEX would be my choice for high temperature systems like that, although I think the actual operating range differences are marginal at the actual service conditions.

If your tubing does not state the limitations and certification agencies, I would use something else :)

phil the limey

if i set my boiler at 180, is that too high for pex to handle?

phil the limey

my system pressure wanders between 12 to 20 psi depending on heat and pump operation.

so i guess im good to 180?

Glenn Sossin_2

What if ??

What if your aquastat wonders off along with your system pressure? I agree with Brad, use an aluminum based pex at the boiler room. Here's a pic of a job one of my customers did with fostapex - very tight boiler room. Notice no burn marks.

Plumdog_2

wow

It's done in layers like a lasagne! I wish I coulda thought of that. Must be 10-12 grand worth of parts on that little wall. Nice work!

Weezbo

there seems to be a group of F-10's or F-12's

what is the sq ft of the place? for some reason the circs look large to me.. maybe only one is an F-12 the bronze body circ seems huge too... whatever.:) Tacos probably real habby

sometimes i think of something like what if...secondary high limits maybe should be required on all boilers not just commercial. Low water cut offs ,i think, have for years ...which is a good thing. ...

phil the limey

them would be fabulous answers had my question been more along the lines of "what should i install?"

i dont intend ripping out all my pex as soon as they come out with something new. my stuff has been installed 8 yrs.