Quote:
Originally posted by copyman
my model
model 40R175254V
MAX-FLOW (GPH) 1140
horse power 1/25 HP
WATTS 87w
SHUT-OFF PRESSURE 6.5 psi
Shut Off Heat Ft 15,5
GPM 19
L/M 72.2
GPH 1140
L/H 4332
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Sounds very, very similar to the Pondmaster 4200 pump (that's the Australian Pondmaster brand which is different to the USA Pondmaster brand) that I had once (I sold it). It was able to push slightly more than 10lpm of flow through a White Water system plus radiator. It was rated for 4200lph, 4.4m of pressure head, and 90W of power.
The secret is in the peak head though. 15.5', or 4.7m of pressure head at shut-off (no flow).
I suggest that the problem with the flow measurement is for you to find. We can't see what your setup is, so we can't see what might be wrong, even if you describe it correctly, but I can say for an almost certainty that however you're measuring it is giving values about 3x higher than actual.