I've got a ViaAqua 1300 in my system, running in-line, no rez, and I leave the pump on 24/7 (though the comp and hence fans only run when I am using it). I've also got the pump 1/2 wrapped in foam to insulate the case from the vibrations. The casing of the pump is quite warm to the touch, but the tubing/rad are barely warm after sitting with all the fans off for 10 hours. Even without the fan running, the rad can dissipate the few watts of heat that the pump puts into the water.
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