Our verdict
Pick the M53 for a typical basement with a lift under about 10 ft. Pick the M98 if your pump runs often in storms or the discharge rises higher: it's 1/2 HP with about 23 ft of maximum head.
The central trade-off
Power. 1/3 HP against 1/2 HP. The M98 keeps more flow at higher lifts.
Head. About 19 ft for the M53 and 23 ft for the M98, per the listings.
Short-cycling. In a small pit the M98 may empty it quickly; check with the basin cycle calculator.
Side by side
| Specification | Zoeller M53 Mighty-Mate Sump Pump | Zoeller M98 Flow-Mate Sump Pump |
|---|---|---|
| Horsepower | 1/3 HP | 1/2 HP |
| Max flow (maker) | Not stated by the maker | 72 GPM |
| Max head (maker) | 19.25 ft | 23 ft |
| Switch | Not stated by the maker | Not stated by the maker |
| Housing | cast iron | Cast Iron |
| Discharge | Not stated by the maker | Not stated by the maker |
| Power cord | Not stated by the maker | 9 foot cord |
| Weight | 21 lb | 14.1 kg |
| Warranty | Not stated by the maker | 12 months from installation or 18 months from manufacture, whichever comes first |
Values are the makers' published specifications. "Not stated" means the maker doesn't publish it.
Which should you choose?
Choose the Zoeller M53 Mighty-Mate Sump Pump if
- Your lift is under about 10 ft
- Water comes in at a normal rate
- You want the lower price
Choose the Zoeller M98 Flow-Mate Sump Pump if
- Your basement takes on a lot of water
- The discharge rises high or runs far
- You want more headroom