when its closed loop there is no head, the water is coming from the tank and
returning to the tank, the pump is just moving it between the input and
output.

pumps state head with open loop where they are pumping water from a sump to
your tank. when you have it closed loop it is coming and going from the
same place, no difference so no head, just the loss of the plumbing. maybe
you should do a little more research before you jump next time.

kc

"Steve "Srfmon"" wrote in message
...
Are you kidding? Who gave you this info?
Head pressure is less when the height the pump has to carry the water
lessened. Regardless if it is a closed loop or whatever. That's just the
way
it works. It's not easy for a pump to lift water & the higher it has to
go,
the slower it is going to do it.
Just look at the box on most pumps they will give you a graph of gph
at
different head pressure. Notice how the gph begins to dip the higher the
head. Elbows do impede flow you are correct about that but not as much as
head pressure.
Steve

"Dragon Slayer" wrote in message
...

"Steve "Srfmon"" wrote in message
...

I'm using it on a closed loop .........................

I built a Hang on bracket out
of 3/8" acrylic to hold it higher so there is little head pressure.



Closed loop only has the head of the restriction of the plumbing
regardless
of height from the tank. the only difference you get between having it
higher up the tank as opposed to sitting on the floor is the extra
friction
from the extra 3' or so of pipe, which I highly doubt you could tell any
difference from as long as it didn't have elbows in it.


kc