I bought a gauge for my system.
I lost about 20 psi (when the system was running, same psi when it is stopped, of course) with the 1/4 inch line.
The 3/8 line has maybe a 1 psi pressure drop, so from 60 to 59 psi, if even that bad.
Don't do 1/4 line!!!!!!!!!!!!!!!!!!!!!
3/8 works perfect, absolutely perfect. The only problem is if you decide to make 100 gallons of water, then my tank drops about 5F in temp. But in normal use it is 100%.
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