Why it matters
The M98 Flow-Mate is Zoeller's 1/2 HP oil-filled cast iron sump pump with a built-in snap-action float switch and about 23 ft of maximum head.
It has a non-clogging vortex impeller, stainless steel hardware, float guard and switch arm, and a 9 ft cord with an LED plug that shows power at a glance.
Who it's for, and who should skip it
Good fit if
- Wetter basements
- Higher lifts
- Zoeller owners
Look elsewhere if
- Sewage or toilet waste
- Draining pools or floors (a utility pump is cheaper)
- Homes that need a backup but have only one pump
Pros and cons
Pros
- 1/2 HP
- Snap-action switch
- LED plug
Cons
- Price
- Warranty from install or manufacture
- Needs pit room for the float
Limitations to weigh
- Maximum head is where flow drops to zero; at your lift the pump moves less than its maximum flow. Size it with the sizing calculator.
- Fit a check valve on the discharge so water in the pipe doesn't fall back into the pit after each cycle.
- Use the sizing calculator with your lift and pipe run before choosing horsepower; bigger isn't better if it short-cycles.
Specifications
Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.
| Material | Cast Iron | Retailer |
|---|---|---|
| Dimensions (seller) | 11"L x 7.75"W x 12.5"H | Retailer |
| Product weight | 14.1 kg | Retailer |
| Max flow (maker) | 72 GPM | Retailer |
| Max head / lift (maker) | 23 ft | Retailer |
| Voltage | 115 V AC | Retailer |
| Horsepower | 1/2 HP | Retailer |
| Model number | 98-0001 | Retailer |
| Warranty | 12 months from installation or 18 months from manufacture, whichever comes first | Retailer |
| Power cord | 9 foot cord | Retailer |
| Housing | cast iron | Retailer |
Alternatives worth comparing
More sump pumps we cover
- Red Lion RL-SP33PED Pedestal Sump Pump
- Superior Pump 92333 Pedestal Sump Pump
- Superior Pump 92551 Pedestal Sump Pump
- Star Water Systems 3CDH Pedestal Sump Pump
All sump pumps, compared in one table · Every Zoeller product we cover
Final verdict
A heavy-duty Zoeller for wet basements.
Where to buy
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