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buffalobillpatrick · 03-12-17, 03:35 PM

http://www.uponorpro.com/calculator/

For 1/2" pex at 100*F

1 GPM through 200' = 8.022 feet of Head loss = 3.45 PSI

So the pump is pressurizing the supply manifold 3.45 PSI greater than the return manifold.

3.45 PSI will push .67 GPM through 400'

So when we double the length of a loop, 2/3 as much water flows.

http://www.pmmag.com/ext/resources/P...0813_Siggy.pdf

See Figure 3

Going from 1 GPM to .67 GPM reduces heat from 8,200 BTU/hr to 7,400 BTU/hr = 10% less

03-12-17, 03:35 PM	#2
buffalobillpatrick Master EcoRenovator Join Date: Mar 2014 Location: Florissant, Colorado Posts: 599 Thanks: 814 Thanked 59 Times in 55 Posts	http://www.uponorpro.com/calculator/ For 1/2" pex at 100F 1 GPM through 200' = 8.022 feet of Head loss = 3.45 PSI So the pump is pressurizing the supply manifold 3.45 PSI greater than the return manifold. 3.45 PSI will push .67 GPM through 400' So when we double the length of a loop, 2/3 as much water flows. http://www.pmmag.com/ext/resources/P...0813_Siggy.pdf See Figure 3 Going from 1 GPM to .67 GPM reduces heat from 8,200 BTU/hr to 7,400 BTU/hr = 10% less Last edited by buffalobillpatrick; 03-13-17 at 10:19 AM..*