"Your math is off a little bit. 3,700 GPH is about 61 GPM. A 5 gallon bucked every 5 seconds."
The pump folks usually figure their output with NO lift.
Add 10ft of lift, 15 ft of hoses , and a couple of elbows and the results may be half the claimed number.
A pail and a watch is always an interesting proof.
If you have a good sized inverter you might consider a basement sump pump , big amps of DC to make 10-12A of 120V , but they really pump, 5 or 10 times as much.
Should you have "bestitis" an engine driven 2 inch pump is over 100 G per min, and could be used as a fire pump with little extra cost.
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