Continuing the same test method as before, I’m measuring restriction or pressure drop over the range of possible flow rates to get a complete look. I simply increase flow across the radiator at .5 GPM increments and record the pressure drop across the rad via manometer. My flow meter is a King Instruments 7520 with valve, my manometer is a Dwyer 477-5 digital manometer, and I have fabricated my own 1/2″copper x 1/4″ brass T fittings to avoid adding restriction to the test.
Radiators are generally pretty low in restriction, so this is normally not something to worry about much unless you plan to run several radiators in series.
First the detailed results:
Followed by a comparison:
Restriction is very low, just a hair higher than the HWlabs SR1. It’s not quite down at UT60,RX360,G-Changer levels, but still very low. It is less than 1/3rd as restrictive as a low restriction CPU block so you should have no worries about connecting several of these together in series if needed.