Yep, 2.0 psi is 55.36" of water, or 4.6 feet. (
www.convert-me.com )
My pump can do max 14.6 feet of head. At 2 psi, it would flow 440 gph, or 7.3 gpm (assuming that there are no other restrictions).
If I can get a couple of pressure gauges, or slap together a manometer, I should easily be able to take some flow measurements of a heatercore.
Hummmm ...manometer...