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Home » Zoeller Sump Pump M-98 1/2HP

The Top Choice for high-capacity, the 1/2 HP Model M98 automatic Sump Pump is designed to remove groundwater from basement sump applications.  Backed by a 3-year warranty, this corrosion resistant pump will provide the dependability expected from a Zoeller pump. Every pump is submerged in water and tested to its published performance curve, ensuring it meets your expectations and delivers peace of mind right-out-of the box.



The Model M98 Sump Pump is designed to remove unwanted groundwater in basement sump applications. The professional-grade, 1/2 HP M98 is the industry standard when you need a higher flow sump pump.  Known as the “Flow-Mate” M98, it is a fully automatic float-operated sump pump.  The white polypropylene float is solid so it cannot become waterlogged.  This ensures that it is always buoyant and able to turn the pump on when necessary.

The Model 98’s switch case, motor housing, and pump housing are each constructed of cast iron.   The corrosion resistant engineered plastic vortex impeller has a smooth surface allowing water and solids to pass freely through the pump.  The pump’s identification tag, float guard, handle, switch arm, and hardware are made of non-corrodible stainless steel.  This attention to detail ensures that the Model 98 is able to withstand demanding, high flow basement sump applications.


  • Oil-filled motor and cast iron motor housing for optimal heat dissipation which prevents the pump from overheating
  • Automatic high flow sump pump with a time-tested, preset, built-in snap action switch that makes for easy installation
  • Corrosion resistant engineered plastic vortex impeller to allow free passage of solids which prevents clogging and lessens downtime
  • Stainless steel float guard that prevents material or debris from collecting on the float ensuring proper operation every time
  • Solid, buoyant, polypropylene float to eliminate the possibility of water infiltration allowing the float to remain buoyant and functional at all times
  • Powder-coated epoxy finish provides corrosion-resistance and extends the life of the pump in harsh environments
  • Stainless steel screws, switch arm, handle and hardware to prevent rust and corrosion over the life of the pump
  • 100% Factory Tested - every pump is submerged in water and tested at the factory to ensure that it performs as expected when you receive it
  • 3-year limited warranty: this model comes with warranty coverage from Zoeller Pump Company, giving you protection over your investment and the peace of mind you expect in a quality product


31 lbs


Height 12 1/4 in   x   Width 7 3/4 in   x   Length 11 in.


1/2 HP


115 V


1 Ph




60 Hz




1-1/2" NPT

Solids Handling:

1/2" (12 mm) spherical solids

On/Off Points:

9-1/2" (24 cm) / 3" (8 cm)

Impeller Material:

Engineered plastic

Impeller Type:


Cord Length:

9’ (2.7 m)


Founded in the family basement in 1939, Zoeller Pump Company is one of the oldest family-owned water pump manufacturers in North America. Headquartered in Louisville, KY, we proudly excel with fourth-generation leadership and an expanding workforce.


Over the past seven decades, Zoeller Pump Company has established itself as a dependable leader in the wastewater industry. Through continuous research and development, we are always improving our products and processes to provide the highest possible quality to our loyal customers and end users.


This dependability is backed by a family commitment to add value for our customers and provide genuine support before, during, and after a sal


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