Pentair Whisperflo Standard Full Rate 1/2 HP Pump - WF-2


Part # 011578

By Pentair Pool Products



Part # 011578

Warranty 1 Year (See Pentair Warranty Card)

Manufacturer Code WF-2

Alternate Part #'s PEN011578, PUR-10-423

Product Description

Inyo Recommended Pumps

Pentair WHISPERFLO incorporates innovative hydraulic engineering to move water more efficiently and quietly than competitive pumps. Under typical operating conditions, Pentair WHISPERFLO offers the greatest water flow of any high-performance pump—yet with the lowest electrical consumption. To circulate more water in less time and at the lowest cost, choose quiet, reliable, Pentair WHISPERFLO.

Commonly Replaced Parts (Click on Link to view/purchase):

 Additional features include:

  • Lower operating costs. Less horsepower required to produce needed water flow, even when used in pool/spa combinations and when operating in-floor cleaning systems.
  • Extremely quiet operation documented in rigorous ETL tests.
  • Patented oversized strainer basket reduces cleaning frequency.
  • 1 Year Warranty
  • High-efficiency impeller maximizes water flow.
  • Life-extending diffuser wear-ring prevents uneven impeller wear.
  • Thicker seal plate withstands loss of prime conditions.
  • Available in standard and energy-efficient models.

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Pentair Whisperflo DimensionsPentair Whisperflo Pump Curve
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Product Specifications

1/2 HP
Port Size:
2 in.
Service Factor:

?     Asked on 9/26/2019 by Don

I have a Prntair Whisperflo pump but no instruction manual. How does one set the top adjustment lid to the backflow position? I want to drain my pool.

A  Answered on 9/26/2019 by InyoPools Product Specialist Lennox H.

Hi, Don. You can view and or download the WhisperFlo Owners Manual. You're unable to adjust the pump lid to the backflow position. That is to be done using the filter valve. 

?     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.