Zoeller M98 Flow-Mate
#7 in 1/2 HP and upFull review
For basements with a high water table or a deep pit where a 1/3 HP pump runs constantly. The cast iron build suits long, heavy duty cycles.
Amazon $328.80$328.80
The Zoeller M98 Flow-Mate and the Wayne SPF50 are evenly matched, rated 3.1 and 3.1. The Zoeller M98 Flow-Mate leads on warranty, build and flow. The Wayne SPF50 wins on value. The Wayne SPF50 costs $183.05 less ($145.75 vs $328.80).
Wayne SPF50
#9 in 1/2 HP and upFull review
A cheap way to get 1/2 HP flow in a light pump. Buyers who want a longer warranty should pay a little more for the Wayne CDU800.
Amazon $145.75$145.75
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Zoeller M98 Flow-Mate for warranty (3-year warranty vs 1-year warranty), build (cast iron motor housing, switch fits a narrow pit vs switch fits a narrow pit) and flow (3,660 GPH at 10 ft vs 3,360 GPH at 10 ft).
- Choose the Wayne SPF50 for value ($43.38 per 1,000 GPH at 10 ft ($145.75, 3,360 GPH) vs $89.84 per 1,000 GPH at 10 ft ($328.80, 3,660 GPH)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 1/2 HP and up sump pump; a clear win is highlighted. How we rank explains each one.
| Factor weight | Zoeller M98 Flow-Mate | Wayne SPF50 |
|---|---|---|
| Overall rating | 3.1/5 | 3.1/5 |
| Value 30% | 31 $89.84 per 1,000 GPH at 10 ft ($328.80, 3,660 GPH) | 93 $43.38 per 1,000 GPH at 10 ft ($145.75, 3,360 GPH) |
| Flow 30% | 46 3,660 GPH at 10 ft | 34 3,360 GPH at 10 ft |
| Build 20% | 67 cast iron motor housing, switch fits a narrow pit | 33 switch fits a narrow pit |
| Warranty 20% | 50 3-year warranty | 0 1-year warranty |
Specifications
| Zoeller M98 Flow-Mate | Wayne SPF50 | |
|---|---|---|
| Pumping | ||
| Motor | 1/2 HP | 1/2 HP |
| Type | Submersible | Submersible |
| Flow at 10 ft | 3,660 GPH | 3,360 GPH |
| Flow at 0 ft | - | 4,300 GPH |
| Max lift | 23 ft | 21 ft |
| Discharge | 1.5 in | 1.5 in |
| Running current | 9.4 A | - |
| Switch and build | ||
| Switch | Vertical float | Vertical float |
| Cast iron housing | Yes | No |
| Alarm or monitoring | No | No |
| Wi-Fi | No | No |
| Cord length | 9 ft | 8 ft |
| Weight | 36 lb | 12 lb |
| Warranty | 3 years | 1 year |