I NEVER use plastic on heating circuits or any pipework under floors or in lofts. To be honest the reason is mainly that most of the leaks I have had to deal with have been caused by mice and rats, and they don't touch copper.
The main failure of Hep2O pipe have come across is through frozen pipework. Some fail at the grab ring and I have had others fail at the thread on the covers.
Personally it's the grey Polyplumb due to the strong all stainless grab rings.
I think the old Hepworth HPB fittings had a solid stainless grab ring too? Why on earth did they downgrade it?
The main failure of Hep2O pipe have come across is through frozen pipework. Some fail at the grab ring and I have had others fail at the thread on the covers.
Personally it's the grey Polyplumb due to the strong all stainless grab rings.
I think the old Hepworth HPB fittings had a solid stainless grab ring too? Why on earth did they downgrade it?