Best Century UST1152 Alternative: Pureline PL1153

When your pool pump motor starts to fail, choosing the right replacement matters both for performance and long-term reliability. Two popular 1.5 HP, single-speed motors you’ll see often are the Pureline PL1153 and the Century UST1152; both are built with a 56J round flange frame and designed to fit many Hayward® and Jacuzzi® pump models. The PL1153 delivers similar power and compatibility to the UST1152 while offering a more budget-friendly option that still delivers quiet operation and durable sealed bearings. In this comparison, we’ll break down key features, compatibility, and real-world performance to help you decide which motor makes the most sense for your pool system.

Is the Pureline PL1153 a direct replacement for the Century UST1152 pool pump motor?

Yes. The Pureline PL1153 is a drop-in replacement for the Century UST1152 1.5 HP round flange pool pump motor, matching the same frame (56J), shaft size, voltage range, and mounting dimensions for quick, no-fuss installation.

1.5 HP Motor, Replaces UST1152, Round Flange 56J Up Rate | By Pureline | PL1153

• 1.5 HP, Single Speed
• Round Flange 56J Frame
• High-quality sealed ball bearings for quiet performance
• 1-Year Manufacturer Warranty

Century® UST1152 – 1.5 HP Replacement Pool Pump Motor Round Flange | 56J Frame | Single Speed

• Round flange with threaded shaft mounts directly to pump housing
• Engineered for smooth, low-noise performance
• Permanently lubricated, sealed ball bearings resist heat & moisture
• Long-lasting design trusted for residential and light commercial pools

The main difference between the UST1152 and the PL1153 is theconfiguration of the motor’s terminal board. The poles of the terminal board and their location are slightly different, but should easily accommodate the conduit and electrical lines used on your old Century or Emerson/NIDEC motor.

The PL1153’s 56J Round Flange, and 1.65 total horsepower (THP) means it can also be used as a replacement for other 1.5 HP uprate, and 1.0 full-rate pool pump motors. Below is a list of other motors the PL1153 is a compatible replacement formotors the PL1153 is compatible with.

• Century (A.O. Smith) 1.5 HP Up Rate Motor, Round Flange 56J Frame, Single Speed – Model B229SE
• Century (A.O. Smith) 1.5 HP Up Rate Energy Efficient Motor, Round Flange 56J Frame, Single Speed – Model UCT1152
• Century (A.O. Smith) 1.0 HP Full Rate Motor, Round Flange 56J Frame, Single Speed – Model ST1102
• Century 1.0 HP Round Flange 56J Full Rate EE Motor – CT1102

Note: Motors are listed as Energy Efficient or Super Efficient motors; whereas the PL1153 is a standard efficiency motor, which will be most costly to operate. Check local codes and ordinances to ensure you may replace an energy-efficient motor with a standard efficiency.

Why should I choose the Pureline PL1153 over the Century UST1152 motor?

The Pureline PL1153 delivers an unmatched combination of performance for the price; that, plus it being a drop-in replacement for UST1152, makes it a can’t-miss bargain for most pool DIY-ers.  The PL1153’s 1-year warranty matches that of the Century’s single-speed motor boilerplate warranty

Will the Pureline PL1153 fit my existing round flange pool pump housing?

Yes. The PL1153 uses the standard 56J round flange design, ensuring compatibility with pumps originally equipped with the Century UST1152 motor — no plumbing or housing modifications required.

Common pump models that use the round flange motor series:

• Hayward Super Pump
• Hayward Super II Pump SP3000 Series
• Hayward MaxFlo SP1800X & SP2800X Series
• Hayward RS Series Pump
• Jacuzzi Magnum
• Jandy PlusHP Original PHP and PHPU Series Pump
• Jandy HHP & HHPU Series Pump
• PureLine Prime Pump – PL2600 Series
• Pureline PL1700 Series Pump
• Pentair / Purex Quietflo & Aquatron

Does the Pureline PL1153 support both 115V and 230V power like the UST1152?

Yes. The PL1153 supports 115/230V dual voltage operation, uses the same round flange mount, and fits standard pump housings that previously used the Century UST1152, allowing most installations without rewiring or plumbing changes.

Is the Pureline PL1153 energy efficient compared to other 1.5 HP pool pump motors?

Yes. The PL1153 features is a standard efficiency motor, similar to the UST1152, which provides a balance of power toenergy usage; helping reduce heat buildup and energy waste while maintaining powerful circulation.

Can I reuse my existing pump seal and impeller with the Pureline PL1153?

The Pureline PL1153 uses same shaft threading and dimensions as the Century UST1152, allowing reuse of the same impeller, seal plate and mounting brackets as your original motor.

But, you should not re-use your old shaft seal when installing a new pool pump motor. Whether you are replacing a UST1152 with a PL1153, or an ST1102 with a UST1152 a new shaft seal should be used to protect your new pump motor. An old shaft seal is a compromised shaft seal.  We suggest replacing your pump’s shaft seal and its other seals and gaskets while installing your new motor to ensure a watertight installation.

To find your pump’s gasket and o-ring kit, come find your pool pump’s GOKIT

Is the Pureline PL1153 suitable for inground pool pumps and spas?

Yes. The PL1153 is engineered for inground pool pumps and spa pumps with a 56J round flange frame, delivering reliable performance for daily filtration, heating, and water circulation needs.

How reliable is the Pureline PL1153 pool pump motor?

The Pureline PL1153 is built with double-sealed bearings, thermal overload protection, and corrosion-resistant components, ensuring long motor life even in harsh pool environments. The PL1153 also features a drip-proof motor ventilation to protect its fromrain and drainage run-off.

Does the Pureline PL1153 include a warranty?

Yes. The PL1153 comes with a manufacturer-backed warranty, giving pool owners confidence when replacing their Century UST1152 motor.

If you have any more questions on the PL1153, please feel free to reach out via chat, support ticket, or at our customer service line at 407-834-2200.