Pool Pump or Pool Motor?

Pool Parts 101: The Difference Between a Pump and a Motor

Here’s the difference between a pool pump and motor

Ok, hear me out. This topic may be on the little shallow end in terms of depth of discussion but for new pool owners, this subject can be confusing. I have worked at Inyo for years and if I had a nickel for every time a caller described a motor as a pool pump or a pool pump as a motor I would have $20,483.15 (probably not an accurate count.) But you get my meaning. It happens a great deal and the miscommunication can cause frustration for both the customer and the technician, so I am here to clear it up.

This topic idea came from one of our technicians because it is a consistent misstep that is easily avoided by knowing simple terminology. The source of the issue arises when a customer states he or she needs a 1 horsepower pump, which sends our tech down a path scanning suitable choices for pumps and matching it to their plumbing needs. The whole process can take five, fifteen or thirty minutes –  it all depends on the information on hand. All things are going smoothly until we provide the part number and the customer sees it is a whole pump instead of the pump (electric motor) they were looking for. And then the process starts all over again, following a long sigh from both sides of the phone.

To start, let’s take it slow and just give you a photo comparison:

This is a pump.

Single Speed Pool Pump

And this is a motor.

Century UST1102-5 (1)

 Again, pump.

Blog Image - Pentair Challenger


Blog Image - Motor (200 x 200)

The Pump

The pump is an assembly made of two separate parts, the wet end and the electric motor. The wet end’s outer component is the housing which is essentially the hull of the pump; it holds all the inner components and the motor bolts to it. The guts of the pump are made up of gaskets, impellers, diffusers, and strainer baskets. All these parts make up the wet end but without something to drive these parts, they are merely pieces of well-formed plastic. The part that makes it come to life is the motor.Step1_P1080150X (1)


The Motor

The electric motor is the driving force behind the wet end of the pump, literally and figuratively. The pump’s shaft spins up to 3,450 revolutions per minute to turn the impeller to draw water from your pool and then push it through your filter and back to the pool. The motor is a cylindrical steel enclosure, usually black but sometimes gold or almond-colored, bolted to the back end of the wet end.

Motors come in three varieties: single, dual, and variable speeds; the latter allows for the most flexibility in terms of pump scheduling and additional water features. The variable speed also provides the most long term savings as it burns less electricity on lower RPM settings and motors can last 3 to 5 times longer than the average life of a single or dual speed motor. Single and dual speed motors are the standard in the industry for now but variable is gaining in popularity. Variable speed motors and newer dual speed motors are made with an attached timer which allows the user to directly program scheduled times into the motor.

A side note, part of the confusion of “pump or motor” comes from not understanding the motor label but we have thought of that too. Read our How to Read a Motor Label guide to get a better understanding of your pump.

Thank you for reading this blog and if you have any questions about your pool pump or motor, please do not hesitate to leave a comment below.

18 thoughts on “Pool Parts 101: The Difference Between a Pump and a Motor

  1. I I want to decrease my electricity bill , what do I replace ? A pump or a motor? The available calculations online, using Volts, amps , HP and my electricity for electricity cost don’t make any sense.

  2. Hey Matthew, this is spectacular and FYI when I Googled “what is the difference between the pool pump and the pool motor” your terrific article came up.

    So I have a US Motor 1081 that’s dying a slow death. Can I replace it with a more modern motor from a different brand name or do I have to stick with US Motor as a replacement?

    1. Thank you.US Motor is the manufacturer and 1081 is the category of the motor; motors designed for pool and spa pump applications are categorized as type 1081. You can replace a 1081 US Motor model with an Emerson 1081, or Century-Magnetek 1081 as long as the Total Horsepower, Frame, and Voltage specs are compatible.

      For example, an Emerson EUST1102 can be replaced by a Century UST1102, but not a Century B853 because the latter uses square flange instead of a round.

  3. Hello Simmons,

    We have a 4 year old pool. The pump stopped working because the motor died. The pump works well.
    We received a $2,100 estimate to replace the entire pump. We were told that replacing just the motor costs 2,000 therefore, its better to replace the pump and the motor.
    Our electrician told us to buy the motor and he will install it. How much is just the motor? Where we can buy it from? What do you think?
    Thank you!

  4. Is there any gasket between the motor and pool pump .I have a new pump and it was shipped without any gasket

    1. If your new pump is leaking then it is defective and you need to get it replaced by the company you purchased it from. If it is not leaking then you do not have a problem.

      The owner’s manual that came with the pump should have a parts listing that can help you figure out which, if any, parts are missing.

  5. I Wore out my computer operator. Wife`

    1. You can buy Hayward branded motors, but they are actually made by Century. Look at this tag for an example, it has Hayward’s name and logo in bold at the bottom, but you can see they hide Century’s name at the top right. I’m not sure why they do it.

      hayward motor label

      1. I bought an AO Smith motor B2853 and the impellar does not work.
        I need to find out what impellar works!

Leave a Reply

Your email address will not be published.

Recommended Resources

What Is the Correct Pool Pump Motor Wire Gauge?

An important part of a new pool pump installation is the circuit wire used for the power source to motor connection....
Read Now

5 Biggest Swimming Pool Mistakes

There are many common swimming pool mistakes and oversights committed by home owners, however innocently.  This overview of pool fails will help...
Read Now

Looking for pool parts?

Shop Motors Shop Filters Shop Pumps Shop Salt Systems Shop Lights Shop Cleaners
Copyright © 2024 INYOpools All rights reserved