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Model 98 Sump Pump

Sump and Effluent Pumps // Residential Use Sump Pumps // Flow-Mate

Model 98 Sump Pump

Effluent or dewatering submersible pumps for septic tanks, low pressure pipe (LPP) and enhanced flow STEP systems.

Features and Benefits

  • Corrosion-resistant, powder coated epoxy finish
  • Durable, cast iron construction
  • Cast iron switch case, motor and pump housing
  • Engineered thermoplastic base
  • No sheet metal parts to rust or corrode
  • All castings are cast iron class 25-30 25000# tensile strength
  • Stainless steel screws, guard, handle, arm and seal assembly
  • Float-operated 2-pole mechanical switch
  • Permanent split capacitor motor, oil-filled and hermetically-sealed, automatic reset thermal overload protection
  • Bearings – upper and lower oil-fed cast iron
  • Carbon and ceramic shaft seal
  • Entire unit pressure-tested after assembly
  • Watertight, neoprene square ring between motor and pump housing
  • Maximum temperature for effluent or dewatering: 130 °F (54 °C)
  • Passes 1/2” (13 mm) spherical solids
  • No screens to clog
  • 1-1/2” NPT discharge (1-1/2” x 2” PVC adapter included with BN and BE Models)
  • On point: 9-1/2” (24 cm)
  • Off point: 3” (8 cm)
  • Major width: 10-1/8" (25.7 cm)
  • Major height: 12" (30 cm)
  • Simplex and duplex systems available
  • Packaged systems available
  • Automatic and non-automatic available
  • Available with piggyback variable level float switch

Consult Factory for Special Applications

  • Electrical alternators for duplex systems are available and supplied with an alarm
  • Mechanical alternators for duplex systems are available with or without alarm switches
  • Variable level float switches are available for controlling single and three phase systems
  • Double piggyback, variable level float switches are available for variable level long cycle controls
  • Refer to FM1922 and FM0806 for temperatures above 130 °F (54 °C)


The sizing of effluent systems normally requires variable level float(s) controls and properly sized basins to achieve required pumping cycles or dosing timers with non-automatic pumps.

Reserve Powered Design.
For unusual conditions a reserve safety factor is engineered into the design of every Zoeller pump.

Product Specifications

Motor 1/2 HP
Voltage 115 or 230 V
Phase 1 Ph
Hertz 60 Hz
RPM 1725 RPM
Type Permanent split capacitor
Insulation Class B
Amps 4.7 - 9.4 Amps
Operation Automatic or nonautomatic
Auto On / Off Points 9-1/2" / 3" (24 cm / 8 cm)
Discharge Size 1-1/2" NPT
Solids Handling 1/2" (12 mm) spherical solids
Cord Length 15' (5 m) standard
Cord Type UL listed
Max Head 23' (7 m)
Max Flow Rate 72 GPM (273 LPM)
Max Operating Temperature 130 °F (54 °C)
Cooling Oil filled
Motor Protection Auto reset thermal overload
Cap Cast iron
Motor Housing Cast iron
Pump Housing Cast iron
Base Engineered Thermoplastic
Upper Bearing Oil-fed cast iron
Lower Bearing Oil-fed cast iron
Mechanical Seals Carbon and ceramic
Impeller Type Non-clogging vortex
Impeller Engineered plastic
Hardware Stainless steel
Motor Shaft AISI 1215 cold roll steel
Gasket Neoprene
  • UL
  • cCSAus
  • Powder Coated Tough

Technical Data


All installation of controls, protection devices and wiring should be done by a qualified licensed electrician. All electrical and safety codes should be followed including the most recent National Electric Code (NEC) and the Occupational Safety and Health Act (OSHA).

Selection Guide

  1. Integral float operated mechanical switch, no external control required.
  2. For automatic use, single piggyback variable level float switch or double piggyback variable level float switch. Refer to FM0477.
  3. See FM1228 for correct model of simplex control panel.
  4. See FM0712 for correct model of duplex control panel.
  5. To select an appropriate basin, go to Basins.


Model Comparison Charts

  • Product Model Comparison Chart: 60hz
    model seal mode volts phase amps hp hz lbs kg
    M98 Single Auto 115 1 9.4 1/2 60 36 16
    N98 Single Non 115 1 9.4 1/2 60 36 16
    D98 Single Auto 230 1 4.7 1/2 60 36 16
    E98 Single Non 230 1 4.7 1/2 60 35 16
    BN98 Single Auto 115 1 9.4 1/2 60 37 17
    BE98 Single Auto 230 1 9.4 1/2 60 40 18

Pump Performance Curves

Design Tools