Hep2o and Barrier advice wanted

[northandcold]

Hi Can anyone advise me, Is standaed Hep2o ok for a closed circuit heating system or should I use Barrier, have heard that standard is ok on open tank systems but not so good on closed, any thoughts out there.

 

[sonray ltd]

always use barrier on heating systems.

 

[northandcold]

Thank you, it makes sense to keep oxygen away from heating and I think more so with closed systems, has anyone seen something on paper to back it up.