Our verdict
Pick the M53 for the standard Mighty-Mate at a lower price. Pick the M57 if you want the snap-action switch with a solid polypropylene float that can't waterlog, and stainless steel hardware and float guard.
The central trade-off
Switch. The M57's built-in snap-action switch and solid float are its main upgrade.
Flow. Zoeller rates the M57 at up to 2,580 GPH; both list about 19 ft of maximum head.
Hardware. The M57 uses stainless steel hardware, float guard and switch arm.
Side by side
| Specification | Zoeller M53 Mighty-Mate Sump Pump | Zoeller M57 Mighty-Mate Sump Pump |
|---|---|---|
| Horsepower | 1/3 HP | Not stated by the maker |
| Max flow (maker) | Not stated by the maker | 43 GPM |
| Max head (maker) | 19.25 ft | 19.25 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 | Not stated by the maker |
| Weight | 21 lb | 27.1 lb |
| Warranty | Not stated by the maker | Not stated by the maker |
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
- You want the classic at a lower price
- Your pit has room for the float arm
Choose the Zoeller M57 Mighty-Mate Sump Pump if
- You want the sturdier snap-action switch
- You want stainless hardware