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buffalobillpatrick · 02-02-18, 01:42 PM

For 1/2” Pex-A

Max recommended loop length is usualy 300’

I recommend making loops shorter to reduce pumping energy.

1 GPM through 300’ needs 5.1 PSI

Cut loop length in half to 2 x 150’

1/2 GPM through each of the 150’ needs .765 PSI

That’s a reduction in pumping energy by a factor of 6.67X

There is not a real need to balance loops if they are within 10% of each other.

A 10% difference in flow makes less than a 1% difference in heat delivered.

ECM pumps like the Grundfos Alpha are a great way to reduce pumping electricity,

But you will need to have a cleanable magnet somewhere in the system to collect the magnetite that is always created by Iron in contact with the system water.

Magnetite can gum-up ECM pumps.

I used a Caleffi Dirt-Mag on my Sons boiler return pipe, a good but pricy solution.

02-02-18, 01:42 PM	#14
buffalobillpatrick Master EcoRenovator Join Date: Mar 2014 Location: Florissant, Colorado Posts: 599 Thanks: 814 Thanked 59 Times in 55 Posts	For 1/2” Pex-A Max recommended loop length is usualy 300’ I recommend making loops shorter to reduce pumping energy. 1 GPM through 300’ needs 5.1 PSI Cut loop length in half to 2 x 150’ 1/2 GPM through each of the 150’ needs .765 PSI That’s a reduction in pumping energy by a factor of 6.67X There is not a real need to balance loops if they are within 10% of each other. A 10% difference in flow makes less than a 1% difference in heat delivered. ECM pumps like the Grundfos Alpha are a great way to reduce pumping electricity, But you will need to have a cleanable magnet somewhere in the system to collect the magnetite that is always created by Iron in contact with the system water. Magnetite can gum-up ECM pumps. I used a Caleffi Dirt-Mag on my Sons boiler return pipe, a good but pricy solution. Attached Images Last edited by buffalobillpatrick; 02-03-18 at 05:02 PM..