I should have known. I had not bothered to look, because I had it in my mind that you had used a HX with screw-on connectors.
(Plus it's a massive thread)!
I will get to that when I have an hour or three to spend reading..
PS:
I'm currently looking around for a good high pressure HX with flare fittings..
Edit:
Thanks for the Very interesting read (and video)..
I'm saving the link here, so I won't have to search again.
http://ecorenovator.org/forum/geothe...html#post12230