Hi

I'm going to be using quite a bit of (22mm and 15mm) plastic barrier pipe
for central heating and wondered if anyone can advise on the following.

Q1. I used a coil of Speedfit a few years ago and it was a bu**er to work
with because it was so springy and wanted to return to its coiled shape.
Are coils of other makes any better in this respect (I have Hep2O and
Equator in mind)?

Q2. Presumably the different makes have slightly different internal
diameters. I calculate that if an internal diameter increases, for example,
from 11mm to 13mm then the internal cross-sectional area increases nearly
40% (area being proportional to diameter squared). This would give a
significant reduction in resistance. Are any of the available barrier pipes
of significantly greater internal diameters than their competitors?

Cheers

Steve