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Thanks Dave. Struggling to get a response from Pipex.Uponor MLCP is fine for secondary return. MLCP is Pex-AL-Pex but not all MLC systems are suitable, check with the manufacturer first.
Discuss PEX-AL-PEX for hot water return (manifold system) in the USA area at PlumbersForums.net
Thanks Dave. Struggling to get a response from Pipex.Uponor MLCP is fine for secondary return. MLCP is Pex-AL-Pex but not all MLC systems are suitable, check with the manufacturer first.
Thanks both. Here are some pics. It's Pipex pipe, but their website wasn't very helpful. It seems to be used for UFH a lot, but assuming that's not an indicator as that runs at lower temperatures?
Thanks. I can see the potential limitations there. I'm going to try again to get a response from the manufacturer.As the others have said, the multi layer pipe with the aluminium layer can be used for secondary return. The reason some manufacturers state their plastic pipes cannot be used as a secondary return is something like "Continuously circulating secondary return system are 'very different' to a heating circuit as the water is constantly replenished and circulated at high temperatures" or words to that effect.
I think the problem they have is that with a constantly replenished systems you are introducing fresh oxygen into the system and then circulating it at a constant high temperature.
These metal layer pipes are quite different from ordinary plastic pipe, even barrier pipe.
Thanks. I can see the potential limitations there. I'm going to try again to get a response from the manufacturer.
Reply to PEX-AL-PEX for hot water return (manifold system) in the USA area at PlumbersForums.net
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