Well the pump is good, but it is not quite as strong as rated in pressure terms.
Static pressure head test at 12.00v is pretty much bang on 2.80m, which is quite a bit lower than the rated 3.20m pressure head.
I've managed to develop a working PQ curve for the pump, which is not final, but will do until I finish more testing.
I also tested at various voltages. To my total surprise the pump actually ran (and started) all the down to 2.80v, which is the lowest I was able to test at. Needless to say, the pressure here is absolutely pathetic, at around 0.09m of pressure head. Flow is a meek trickle that I didn't measure. I measured up to 14v, which is the peak recommended voltage for the electronics inside the pump. Here's the static pressure head chart. Pressures are rounded to the closest 5cm mark.
3.0v => 0.10m
4.0v => 0.22m
5.0v => 0.40m
6.0v => 0.65m
7.0v => 0.90m
8.0v => 1.20m
9.0v => 1.55m
10.0v => 1.95m
11.0v => 2.40m
12.0v => 2.80m
13.0v => 3.25m
13.5v => 3.45m
14.0v => 3.70m
