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.
Last edited by buffalobillpatrick; 02-03-18 at 05:02 PM..
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