Automatic Effluent or Dewatering Submersible Pump, 115 V, 1/2 HP

Zoeller Flow-Mate M98 1/2 HP Cast Iron Submersible Sump Pump – Heavy-Duty Groundwater Management

The Zoeller M98 Flow-Mate is a 1/2 HP submersible sump pump engineered for high-performance groundwater removal in residential and light commercial applications. Constructed from cast iron with a powder-coated epoxy finish, this pump is designed for extended service life under demanding conditions.

Equipped with a non-clogging vortex impeller and automatic float switch, the M98 delivers reliable, unattended operation while handling spherical solids up to 1/2". This model is factory-tested and assembled in the USA, ensuring consistent quality for field installations.

Performance and Features

• Motor Power: 1/2 HP, thermally protected
• Voltage: 115V or 230V, single phase
• Discharge: 1-1/2" NPT vertical
• Max Flow Rate: 73 GPM at 5' head
• Max Total Dynamic Head: 23 feet
• Solids Handling: Up to 1/2" spherical solids
• Temperature Rating: Rated for continuous operation at 130°F
• Cord Length: 15 feet with grounded plug

Construction Details

• Pump Housing: Cast iron with corrosion-resistant epoxy coating
• Impeller: Engineered thermoplastic vortex design for non-clog operation
• Switch Type: Integral float-operated mechanical switch for automatic cycling
• Bearings: Oil-lubricated for continuous cooling and reduced wear
• Weight: Approximately 40 lbs

Installation Considerations

The M98 is designed for installation in sump pits at least 18" in diameter. For optimal performance, ensure the pit is free of debris and that the discharge line is properly sloped. The factory-installed float switch simplifies installation, but access to a dedicated 15A circuit is required. Always follow local electrical and plumbing codes.

Ideal Use Cases

• Basement sump pits and crawl space drainage
• Stormwater and foundation dewatering
• Backup pump systems (paired with battery backup)

Contractor Notes

Trusted across the industry, the Zoeller M98 delivers consistent results with minimal callbacks. Its robust construction, automatic operation, and proven longevity make it a preferred choice for service contractors and system installers handling high groundwater or seasonal flooding. The pump arrives fully assembled and factory-tested for immediate deployment.