"Steve" wrote in message
...
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

Thanks all. Very helpful. I'll be using Hep2O.

Steve