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jaydee · 11-12-2004, 11:51 PM

Head is basically the resistance of the flow in the loop.

EDIT: In other words the more restrictive the loop is the higher head rated pump you want. 300GPH at 0 head means there is no restriction in the loop. 300GPH at 3 feet of head means there is enough restriction in the loop to equal putting 3 feet of vertical pipe/tubing on the outlet of the pump and then measuring the flow at the end of the 3 feet of tubing/pipe.

11-12-2004, 11:51 PM	#3
jaydee Put up or Shut Up Join Date: Dec 2001 Location: Spokane WA Posts: 6,506	Head is basically the resistance of the flow in the loop. EDIT: In other words the more restrictive the loop is the higher head rated pump you want. 300GPH at 0 head means there is no restriction in the loop. 300GPH at 3 feet of head means there is enough restriction in the loop to equal putting 3 feet of vertical pipe/tubing on the outlet of the pump and then measuring the flow at the end of the 3 feet of tubing/pipe. Last edited by jaydee116; 11-12-2004 at 11:56 PM.