Copper or 'Plastic'...??

[Plumbagain.]

Use plastic for ufch.
15mm and 22mm MLCP is great also for general plumbing.

 

[Best]

Underfloor heating is a different thing entirely, so can’t be compared to plastic pipe on rads or for high pressures etc.
Ufh uses different types of pipe and works on lower heat.

 

[kezz_123]

Copper way better Finnish if done correct.
Couple years back had to run hot pipe from one end of room to other at height and was a good few meters. (was in a butchers) . New when the hot went through the pipe it would look like the readings of a heart monitor . Clipped the pipe more than standard to of course.!

 

[Jim Goodenough]

Some may find this interesting - taken from Polypipes literature