Century 1/2 HP Square Flange 56Y Full Rate EE Motor - B2845



Part # B845

By Century Motors

  5 Average  



Part # B845

Warranty 1 Year

Manufacturer Code B2845

Dimensions 13" L x 9" W x 6.5" D

Alternate Part #'s 11357, 1203155404, 165267, 177384, 193991, 1K051, 5KCR38PN6146X, 5U158, 816526707, AE100CH, AE100CHL, AE100DLL, B845, B862, B862SE, C1446, EB845, K48J2P100, K48J2P101, K48J2P101A1, K48J2PA101, K48J2PA101A1, K48J2PA105, K48J2PA105A1, K48J2PU100, QC1052, SQ205E, SQ207UE, SQD50FL1E

Product Description

Century Centurion replacement motors for Pentair WhisperFlo, energy efficient, full rated pumps. Specifications: HP = 1/2, RPM = 3450, Voltage = 115/208-230, Amps = 8.8/4.4-4.5, Service Factor = 1.90, Frame = 56Y, Shaft = Threaded.

Note: NOT California Title 20 Compliant. 

California Title 20 Compliant Options:

  • Dual Speed - SQS1072R - Requires Toggle Switch or External Controller
  • Variable Speed - ECM16SQU
Motor Dimensions Motor Dimensions
Motor Image Motor Image

Product Specifications

Motor Name:
0.5 HP B845 & B2845 Replacement Pool Motor
0.5 HP
3450 RPM
208 - 230/115 V
4.5 - 4.4/8.8 amp
Service Factor:
Total HP:
0.95 HP
Stock #:
B845 or B2845
Overload Protector:
Dimension Letter:
12.4 in.
Commonly Used On:
Pentair WhisperFlo
Energy Efficient:
Energy Efficient
NOT California Title 20 Compliant

?     Asked on 4/9/2020 by Jay

Afternoon, After 17 years of use, my pool pump gave out at the end of the 2019. Old pump is A.O.Smith Part # 7-186236-28 (see photo) with your guide suggests part number B2846, but I noticed a recommendation for a more efficient pump, part B2845. I want to ensure B2845 is compatible for my use. Also, plan on ordering GoKIT32Salt. Any information would be greatly appreciated. Thank you, Jay


A  Answered on 4/9/2020 by InyoPools Product Specialist Patrick P.

Hi Jay, Everything you have mentioned is spot on. The B2846 Motor is the direct replacement for the motor in your photo however you can go with this B2845 Motor as a replacement as well and it is more energy-efficient. The B2845 draws 4.4 amps at 230V and 8.8 amps at 115V where the B2846 draws 5.4 amps at 230V and 10.8 amps at 115V. Yes, you will need the GOKIT32SALT Seal Kit when you replace your motor. All of these items are currently in stock ready to ship!

?     Asked on 1/25/2020 by Remy

Hi, I have a Pentair WhisperFlo WFE-2 pump. The motor needs to be replaced. Can you please advise what model motor I need? I attached some photos.


A  Answered on 1/29/2020 by InyoPools Product Specialist Lennox H.

Hi, Remy. This B2845 motor is the correct replacement. You will also need the Whisperflo Tune Up Kit - GOKIT32 or GOKIT32SALT

?     Asked on 1/15/2020 by steve

what kit do i order for shaft seal and gaskets for this pump motor

A  Answered on 1/15/2020 by InyoPools Product Specialist Lennox H.

Hi, Steve. We will need the pump housing model in order to locate the shaft seal and gaskets. If you do not have that info, pictures will work. 

?     Asked on 3/4/2019 by

Will this work with Pentair 7-177449-03

A  Answered on 3/4/2019 by InyoPools Product Specialist Michelle B.

Hello,This will be the correct motor you will need for your pump.http://www.inyopools.com/Products/00200017039436.htm

?     Asked on 5/29/2017 by


A  Answered on 5/29/2017 by InyoPools Product Specialist Patrick P.

No this is not the replacement for the 177474-01. You would require this B2853 Replacement Motor as the replacement to your 177474-01 motor.

?     Asked on 6/17/2015 by

I have an Pentair Intelliflo VF so what parts would I have to swap out(Impeller, diffuser,kit,) to do a motor replacement with this one please? Also, what is the impeller screw I need for this and is it the same size as the Intelliflo impeller screw? Thx.

A  Answered on 6/19/2015 by InyoPools Product Specialist Lennox H.

You will need to replace the Diffuser Assy., 3/4 - 2 1/2 Hp (072927)Impeller, 1/2 Hp Full (073126), you can reuse the Set Screw (071652) and get a Pentair/Purex Whisperflo Tune Up Kit (GOKIT32) in order to use the 1/2 HP  EE - Full Rate Motor (B845).

?     Asked on 2/16/2012 by Guest

I just finished replacing the shaft seal on my booster pump. As soon as I turned the pump on water was leaking from the shaft seal. Is it defective or am I doing something wrong?

A  Answered on 2/16/2012 by InyoPools Product Specialist Patrick P.

Depending on the model, the installation of a booster pump shaft seal can be slightly different than a pool pump shaft seal. Some booster pump and pool pump shaft seals require that a silicone sealant be used on the outer areas of the metal seat of the shaft seal. The seal will need to be lightly hammered into the body of the pump. You can use a 1 inch PVC coupling or a piece of 1 1/4 inch PVC pipe and a rubber mallet. This procedure will apply to any pool pump or booster pump using a >PS-1000 style shaft seal.

?     Asked on 1/19/2012 by Guest

I'm trying to replace the motor on my pool pump but all these numbers and abbreviations on the motor label are really confusing me. What do they mean?

A  Answered on 1/19/2012 by InyoPools Product Specialist Patrick P.

Replacing a pool pump motor is not as difficult as it seems. You can try looking here. If you need help figuring out what the information on your label means. If you are still having difficulty figuring it out you can call us at our toll free number or you can send us a photo of your motor label here.

?     Asked on 1/12/2012 by Guest

Why should I purchase a Tune Up Kit?

A  Answered on 1/12/2012 by InyoPools Product Specialist Patrick P.

A Tune Up Kit includes all of the essential replacement seals and gaskets for the pump. The seals and gaskets should be replaced when installing a new motor on your pump. New seals will prevent the pump from leaking water or losing the prime. A Tune Up Kit will protect your motor and ensure that the pump is working efficiently.

?     Asked on 1/12/2012 by Guest

Why do I need to purchase a new shaft seal?

A  Answered on 1/12/2012 by InyoPools Product Specialist Patrick P.

We strongly recommend replacing the shaft seal. The purpose of a shaft seal is to prevent water from running down the shaft of the motor and into the motor housing. Water will damage the bearings and cause the motor to fail. A new shaft seal should be installed whenever a motor is replaced. The motor manufacturer can deny the warranty if the motor fails to due to water damage from a faulty shaft seal. To find your shaft seal you will need to visit our Pool Pump Parts Page or the Spa Pump Parts Page and select your make and model.

?     Asked on 1/11/2012 by Guest

What is Service Factor?

A  Answered on 1/11/2012 by InyoPools Product Specialist Patrick P.

Service Factor(SF) is a multiplier that when multiplied by the horsepower of the motor indicates the total permissible horsepower loading that may be carried when the motor is operating at rated voltage and frequency. The most important thing to remember when replacing a motor is that the replacement motor's horsepower times its service factor must be equal to or greater than the original motor's horsepower times its service factor. The Service Factor rating can be found on the motor label. See Step 4 of our How to Read a Pool Motor Label guide.


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