Using PEX-AL-PEX for radiator connections

[75gmck25]

Not quite a garage, but for a basement workshop:
I have a Buderus gas hot water boiler that is connected to radiators with galvanized pipe hung below the floor joists. I'd like to move some of the piping up to run through the joists so that I get additional head room and get rid of pipes that run across in front of the windows.

For a boiler that runs a max of 130-140 degrees, what type of PEX would be recommended? The PEX-AL-PEX seems like a better match for replacing galvanized pipe, but I don't know whether the bend radius will make it hard to snake it up and run through the floor joists. Would standard PEX hold up for connecting hot water radiators at up to 140 degrees?

Thanks,

Bruce

 

[yeldogt]

My whole house was fitted with radiant floors and panel/ runtal radiators using regular O2 barrier PEX -- almost 20 years ago. PEX has been used throughout europe for almost 50 years to supply panel radiators -- at up to 180.

I have used AL PEX for radiant floors both in slab and "warmboard" -- Warmboard specifies that AL PEX be used because of the greater heat transfer.

It is my understanding that for radiator connection standard PEX is preferred as it has less of a heat loss along the length.

 

[98ssuck]

Uponor heat pex has the same oxygen barrier as pex al pex. But has a thermal elastic memory so if you kink it you just heat it up and it is back to factory shape. Uponor warranties it's joint to cover all costs from a leak. How well does a pipe that is made of aluminum retain its heat?