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pex/oxygen diffusion

How serious is the problem of oxygen diffusion through pex tubing? I have some installed pex I am thinking of trying to replace with hepex but I am wondering if this is really necessary?
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Comments
1. What type of heat source do you have?
2. Are there iron or steel components in the system?
3. Is it an open or closed loop?
4. Is there glycol in the system?
5. What type off emitters do you have?
It can be quite serious under the right/wrong circumstances.
You can choose to do what you want, but you cannot choose the consequences.
We had failures within 2 years on the high operating temperature systems, mainly baseboard running 180F. That included PB, rubber and pex systems.
Lower temperatures = slower ingress.
Here is a system I connected, against my better judgement
Roll the dice.
Chemical treatment with an O2 scavenger inhibitor is another option, but treatment doses will be needed occasionally.
Or separate the piping, from steel and iron with a HX and all non ferrous components on the tube side. Stainless bodied circs, radiant exp tanks that are lined, etc.
Weigh the pros and cons of each "fix"
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