Hot water return in Hep2O? is this really a problem?

[Great_scot_selfbuild]

I've come across this statement:

“Hep2O should not be installed in Continuously operated re-circulating systems (Secondary Hot Water Circulation / Ring main installations).”

 

I was planning on using Hep2O pipework from the plant room to the end points, with the long hot water runs (20-30m) having a 10mm return line to enable circulation to avoid running taps, wasting water and waiting for the water to heat up.

 

I was sure I'd come across this approach by others - is this something I should be worried about? if not, why not?