Why it matters
The CDU800 is the 1/2 HP version of Wayne's top-suction pump, rated at up to 5,100 GPH. Its vertical float is rated for 1 million cycles and suits narrow pits.
It's cast iron and steel with a 1-1/2 in NPT discharge, needs no weep hole, and carries a three-year warranty.
Who it's for, and who should skip it
Good fit if
- Wetter basements
- Higher lifts than 1/3 HP handles
- Narrow pits
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
- Top suction
- Vertical float
Cons
- 3-year warranty
- Can short-cycle in small pits
- Steel motor housing
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 | Steel | Retailer |
|---|---|---|
| Dimensions (seller) | 9"L x 6.5"W x 11.5"H | Retailer |
| Product weight | 12 lb | Retailer |
| Max flow (maker) | 85 GPM | Retailer |
| Max head / lift (maker) | 20 ft | Retailer |
| Model number | CDU800 | Retailer |
| Warranty | 3 Years | Retailer |
| Horsepower | 1/2 HP | Retailer |
| Housing | Cast Iron | Retailer |
Alternatives worth comparing
More sump pumps we cover
- Red Lion RL-SC50V Sump Pump
- Superior Pump 92151 Sump Pump
- Liberty Pumps 257 Sump Pump
- Zoeller M53 Mighty-Mate Sump Pump
All sump pumps, compared in one table · Every Wayne product we cover
Final verdict
A strong value step up from 1/3 HP.
Where to buy
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Questions buyers ask
How much does it pump?
Up to 5,100 GPH, per Wayne.
What's the discharge size?
1-1/2 in NPT.