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How Much Flow Volume From A Pool Pump

How Much Flow Volume From A Pool Pump
This is a continuation of variable speed swimming pool pump bench tests to determine flow rates and electrical consumption for variable speed pool pumps operating at various RPM speeds. This article is looking at a bench test that has this pump installed with a 2" suction line and a 1.5" discharge line and installed with a 240 Volt electrical service. To see these additional bench tests you can view these articles:


Pentair SuperFlo Bench test 2" pipes / 240 Volt

Pentair SuperFlo Bench test 1.5" pipes / 240 Volt

Pentair SuperFlo bench test 1.5" pipes / 120 Volt


This test will look at the Pentair Superflo variable speed pump installed with a 240 volt electrical service, however this time the system will be using only a single suction line and a single return line. The suction line will be 2" in size and the return line will be 1.5" in size. This test is to help illustrate real world examples of how much your plumbing configuration and pipe size will affect the flow rates and electrical efficiency of your pump. In the attached video you will see that electrical use is being monitored by an external Wattage meter, and the flow rate (which is extremely important for variable speed pumps) is being monitored via a series of analog flow meters. For more information about the importance of flow and flow meters and where you can get one you can read this article about swimming pool flow meters.





Pentair SuperFlo Variable Speed Test

Voltage - 240 Volts
Suction Line - Single 2"
Return Line - Single 1.5"


750 RPM
Flow Rate - 13 GPM
Current Draw - 0.90 Amps
Power Consumption - 91 Watts


1000 RPM
Flow Rate - 16 GPM
Current Draw - 1.03 Amps
Power Consumption - 134 Watts


1250 RPM
Flow Rate - 27 GPM
Current Draw - 1.18 Amps
Power Consumption - 190 Watts


1500 RPM
Flow Rate - 35 GPM
Current Draw - 1.43 Amps
Power Consumption - 268 Watts


1750 RPM
Flow Rate - 42 GPM
Current Draw - 1.82 Amps
Power Consumption - 375 Watts


2000 RPM
Flow Rate - 48 GPM
Current Draw - 2.38 Amps
Power Consumption - 515 Watts


2250 RPM
Flow Rate - 60 GPM
Current Draw - 3.11 Amps
Power Consumption - 697 Watts


2500 RPM
Flow Rate - 63 GPM
Current Draw - 4.04 Amps
Power Consumption - 914 Watts


2750 RPM
Flow Rate - 70 GPM
Current Draw - 5.20 Amps
Power Consumption - 1190 Watts


3000 RPM
Flow Rate - 77 GPM
Current Draw - 6.54 Amps
Power Consumption - 1500 Watts


3250 RPM
Flow Rate - 83 GPM
Current Draw - 8.16 Amps
Power Consumption - 1870 Watts


3450 RPM
Flow Rate - 88 GPM
Current Draw - 9.77 Amps
Power Consumption - 2250 Watts



This test is similar to this other 240 Volt Pentair Superflo bench test except that now there is only a single suction line (2") where the other test had dual suction lines, one 2" and one 1.5". While the tests both show very comparable flow rates and electrical consumption for the pump, the dual suction line test shows slightly better flow numbers that this test with only a single suction line. In both tests the pressure side (return line) is only a single 1.5" pipe and so this would represent a system with a high resistance to flow. Most pools will have more than a single return line and thus the flow rates will be different for that configuration. Be sure to subscribe to the Swimming Pool Steve YouTube Channel so you see the continuation of these variable speed pump bench tests.


While these bench tests are useful for examining the electrical cost and flow potential for variable speed pool pumps it is important to note that this is only a bench test, and not a real swimming pool system, but more importantly every swimming pool and pump installation will be unique. you might experience numbers similar to what you see here however it is likely that you flow volumes will be slightly less due to added resistance in peripheral devices like dirty filters, pool heaters, and not to mention pools located a far distance from the pump location...all of these will affect the performance of your pump. This is why all pool owners with a variable speed pump would benefit from installing a flow meter like the ones featured in this video as this will help you to maximize your savings while being able to fine tune the amount of filtration that your pool needs. For more information you should read this article about swimming pool flow meters.


240 Volt Pentair SuperFlo bench test

120 Volt Pentair SuperFlo bench test

Swimming pool flow meters

How much electricity does a pool pump use

What happens if you run a pool pump at 1000 RPM

Running a pool pump 4 hours per day

How does a variable speed pump save you money

Variable speed pump schedules







Swimming Pool Steve

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