Wayne CDU790
#1 in Up to 1/3 HPFull review
A strong value for an ordinary basement: more flow at 10 ft than most 1/3 HP pumps for a modest price.
Amazon $136.90$136.90
The Wayne CDU790 rates 4.1 among up to 1/3 HP sump pumps; the Wayne SPF50 rates 3.1 among 1/2 HP and up ones. The Wayne CDU790 costs $8.85 less ($136.90 vs $145.75).
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.
Scores side by side
These two sit in different size classes (up to 1/3 HP and 1/2 HP and up), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | Wayne CDU790 | Wayne SPF50 |
|---|---|---|
| Overall rating | 4.1/5 | 3.1/5 |
| Value 30% | 91 $44.74 per 1,000 GPH at 10 ft ($136.90, 3,060 GPH) | 93 $43.38 per 1,000 GPH at 10 ft ($145.75, 3,360 GPH) |
| Flow 30% | 100 3,060 GPH at 10 ft | 34 3,360 GPH at 10 ft |
| Build 20% | 33 switch fits a narrow pit | 33 switch fits a narrow pit |
| Warranty 20% | 50 3-year warranty | 0 1-year warranty |
Specifications
| Wayne CDU790 | Wayne SPF50 | |
|---|---|---|
| Pumping | ||
| Motor | 1/3 HP | 1/2 HP |
| Type | Submersible | Submersible |
| Flow at 10 ft | 3,060 GPH | 3,360 GPH |
| Flow at 0 ft | 4,600 GPH | 4,300 GPH |
| Max lift | 22.5 ft | 21 ft |
| Discharge | 1.5 in | 1.5 in |
| Switch and build | ||
| Switch | Vertical float | Vertical float |
| Cast iron housing | No | No |
| Alarm or monitoring | No | No |
| Wi-Fi | No | No |
| Cord length | 8 ft | 8 ft |
| Weight | 22 lb | 12 lb |
| Warranty | 3 years | 1 year |