Hepex used in chilled water applications

Solar_Hog

Does anyone know what the cold limit is for hepex tubing? I have a water furnace that chills water and heats water. During the summer months I want to run chilled water but I don't know what the rating is for hepex or even if it can handle cold water.

EBEBRATT-Ed

Don't know for sure but your probably good down to +32 degrees

Zman

Hepex is commonly used in snowmelt systems. Those systems get well below 0 degrees with no issues.

mattmia2

upnor has an extensive manual about installation of hepex/aquapex, did you try looking at that?

Zman

mattmia2 said:

upnor has an extensive manual about installation of hepex/aquapex, did you try looking at that?

https://assets.supply.com/ul_pdfs/712593_ownersmanual.pdf

dopey27177

Could only find this rating

@160 psi 73F

best to call the manufacturer

Jake

Jamie Hall

It just gets more and more rigid. I have used in applications where it gets well below freezing -- inside and out -- and other than not flowing much water when its frozen solid (!) it's fine when it thaws. I'd allow a little extra length, though, because it does contract and you don't want it to actually pull on a fitting.

I don't know what the brittle transition temperature is, but it has to be pretty low -- I've not seen evidence of brittle behaviour.