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Must I use copper?

I suspect this is a very (very) basic question, but I'm a complete newbie.
Must we use any copper in a closed radiant system?
Why not pipe exclusively in pex (3/4" or 1") from the boiler through the controls/pumps/valves/manifold/etc.?
Thanks!
0
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Comments
Many still prefer copper for the near boiler piping. It is easier to support and looks more professional. It can also handle the hot temps sometimes seen near the boiler better than pex will.
Albert Einstein
Thanks guys!
So, as long as I'm using hePex (for example), and not physically/mechanically supporting the components with the piping, and don't object to the aethestics of it, it's totally fine using 100% pex?
Albert Einstein
Once you are far enough away from the boiler, and can neatly attach the PEX to a manifold, or support it on a wall or framing, then you will have a good working system that looks good too.
After you are unable to work on it yourself, some professionals will need to make repairs and if you are not around to assist/instruct the guy, your loved ones will not be happy with the recommendations of the Pro.
If I walked into something like this I would recommend an expensive repipe or a complete new system.
Retired HVAC Contractor from So. Jersey Shore.
Cleaned & services first oil heating system at age 16
Specialized in Oil Heat and Hydronics where the competition did Gas Warm Air
If you make an expensive repair and the same problem happens, What will you check next?
I use threaded components and a lot of unions.
Black fittings and especially unions are less than copper fittings.
trainer for Caleffi NA
Living the hydronic dream
hot_rod: I looked around and noticed that the Uponor EP manifold uses 1-1/4" connections while the Uponor Stainless manifold uses 1", so I asked my supplier (who is also designing my system). He explained that the heating capacity (BTU carrying capability?) is around twice the amount for the 1-1/4" pipe and because I have plans to add zones later, he recommends staying with the 1-1/4" and sweating the handful of connections. Thank you!