"Dragon Slayer" wrote in message
...
its quite simple, closed loop has NO HEAD. only the restriction of the
plumbing.

kc


I have to chime in again with my experience in the HVAC field.
Dragon Slayer (kc) is correct in the fact that there is no added head
pressure from vertical lift in a closed loop system.

In a Closed Loop System water has no where to go other than the loop that it
is in..
You can not compress water so if the pump moves a drop of water in a given
direction, it pushes the rest of the water all the way through the loop
reguradless of gravity.

HTH

~Mort