PEX-AL-PEX for hot water return (manifold system)

[elvis80]

Have you checked with the manufacturer if it can be used on potable water?
we get 500m coils of a very similar pipe to that, from Wunda floor. But it’s only been certified for use on closed heating circuits. That’s not to say it won’t work or leak. It means the company hasn’t put it through the testing process, needed to make it wras approved.
if it isn't, you could invalidation your insurance, if there was a problem and a claim.

Thank you, that's a really good tip. At the moment, I can't get any response from the company (based in Spain - Pipex). I'm going to try calling them, but I thought email would be the best way, given the potential language barrier.

 

[Uheat – Jake]

Thank you, that's a really good tip. At the moment, I can't get any response from the company (based in Spain - Pipex). I'm going to try calling them, but I thought email would be the best way, given the potential language barrier.

If you'd like a price on our pipe which is identical then feel free to give me a call.

 

[exedon2]

When I spoke to polypipe technical about this a few years ago they told me the constant temperature was caused the inner layer to fail bog big enough bits got back to the secondary pump to jam it.
We do a fair few secondary return systems use tectite metal tube with correct insert and there demountable fittings. You need there re rounding tool but you can bend it with a machine clip only once every meter what's not to like!

 

[elvis80]

Hi All. I thought it was only polite to round this off... I opted to go copper for the hot water loop, but poly everywhere else. It was £400 for labour and materials for the first phase. It'll probably be just a bit less for the other side of the house (two-stage build). I thought taking the risk on plastic was a false economy for a house I'll be living in for 30yrs+. I saved the money by installing all my own waste / soil pipes (above ground) and supply pipes from the manifolds, plus the cold loop. It was a piece of p*ss tbf. Really appreciate everyone's thoughts and views.

 

[Jim Goodenough]

Hi All. I thought it was only polite to round this off... I opted to go copper for the hot water loop, but poly everywhere else. It was £400 for labour and materials for the first phase. It'll probably be just a bit less for the other side of the house (two-stage build). I thought taking the risk on plastic was a false economy for a house I'll be living in for 30yrs+. I saved the money by installing all my own waste / soil pipes (above ground) and supply pipes from the manifolds, plus the cold loop. It was a piece of p*ss tbf. Really appreciate everyone's thoughts and views.

Any pics of your install?