Zoeller M98 Flow-Mate Sump Pump 1/2 HP
- 1/2 HP oil-filled motor, cast iron housing
- Up to 4320 gallons per hour, 72 gpm listed
- 23 feet maximum lifting height
- Automatic snap action float switch, built in
- 115V power, 9 foot cord with LED plug
- Vortex impeller, non-clogging, passes solids
- Stainless steel hardware, float guard and switch arm
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A dependable automatic pump for a residential sump pit, with a float switch and a power-check plug; the listing omits the discharge size, so confirm it against your pipe before ordering.
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ASIN: B00C6XTNNYModel: M98 Flow-MateCategory: Sump Pumps
Overview
Basement sump pits are the home of the Zoeller M98 Flow-Mate, a submersible pump with an oil-filled motor in a cast iron housing. A built-in float switch starts and stops it as the water level rises and falls, and a vortex impeller moves the water out.
Hands-off operation and a plug that shows power at a glance make it a low-attention guard for a basement. Missing from the listing is the discharge connection size, which matters when tying into existing pipe.
Who it's for
Houses with a basement sump pit and a nearby outlet are the setting, since the pump runs on its own once plugged in. Homes that lose power during storms need a separate backup system, which the pump does not provide.
Pros and cons
- Float switch runs it automatically
- LED plug shows power at a glance
- Oil-filled motor sheds heat
- Vortex impeller passes solids
- Discharge pipe size not listed
- No battery backup
- Needs an outlet within cord reach
- Impeller is plastic, not metal
Performance notes
Real output depends on how high the water must be lifted, with flow dropping as the discharge run climbs toward the maximum lift. The oil around the motor carries heat into the cast iron housing, which helps on long run cycles. The snap action float decides when it starts, so a clear path for the float in the pit matters.
Specifications
| Brand | Zoeller |
|---|---|
| Model | M98 Flow-Mate |
Frequently asked questions
Is the Zoeller M98 a battery backup sump pump?
No. It is a 115V AC submersible pump that plugs into an outlet, and the listing mentions no battery backup.
What size discharge pipe does the Zoeller M98 2P550 use?
The listing does not give the discharge size. Check Zoeller documentation before buying fittings.
Does the Zoeller M98 need a separate float switch?
No. A snap action float switch is built in, with a stainless steel float guard and switch arm.