If I had an inline pump that drew a true 35 watts, then I'd generally expect about 28 watts to go into the water and 7 watts (20%) of heat to be dissipated off the motor
If my system water temp was 5C above ambient under load and the total load was a 100 watts (cpu and pump combined), then I'd expect submerging the pump to increase the water temp around .35C (everything else being the same).
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