From
this thread on OCAU (sub. required) which was I think for the "rev 1" D4:
Quote:
Peak Pressure Head (mH2O) @ 0 flow - all values to be considered ±0.05m and were rounded to closest 0.05m interval. These were measured by hanging a length of tubing from a ladder on the second story landing of my house and marking the water levels reached at each voltage.
5V: 0.65m
6V: 1.05m
7V: 1.50m
8V: 1.95m
9V: 2.40m
10V: 2.90m
11V: 3.35m
12V: 3.90m
The 12V value of 3.90m is somewhat higher than officially stated (3.50m), but I checked this a number of times, including using a multimeter to verify the voltage. I have the ability to run the pump at up to 16V, but ran out of tubing (only had 4m of it attached to the outlet).
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Would guess that max flow at 9v would be roughly 75% of max flow at 12v.