Bottom Line Up Front
The Wayne CDU980E is a 3/4 HP cast iron and stainless steel sump pump handling up to 4,600 GPH — 70% more flow than standard 1/3 HP units. For commercial properties with high groundwater inflow, large basement footprints, or sumps that must handle significant storm inflows, the CDU980E is the correct specification. The cast iron construction and stainless impeller provide durability comparable to professional-grade Zoeller units at a lower price point.
Spec Sheet
| Model | CDU980E |
| HP | 3/4 HP |
| Max Flow | 4,600 GPH (77 GPM) at 0 ft |
| Max Head | 25 feet |
| Construction | Cast iron / stainless steel |
| Switch Type | Vertical float |
| Discharge Size | 1.5 inch NPT |
| Voltage | 115V / 60Hz |
| Solids Handling | 1/2 inch spherical |
| Warranty | 3-year limited |
| Price Range | $200–$320 |
Extended Analysis
The Wayne CDU980E occupies the gap between standard 1/3 HP residential sump pumps and commercial-grade submersible pumps. At 3/4 HP with a maximum flow of 4,600 GPH, it handles inflow rates that would exceed a 1/3 HP unit's capacity — specifically, large commercial sumps, high-water-table properties, and any application where calculated inflow exceeds 30 GPM.
The cast iron motor housing provides the same thermal performance advantage as the Zoeller M53 — better heat dissipation during high-cycle operation. The stainless steel impeller resists the minor corrosion and abrasion from gritty groundwater that degrades plastic impellers over time. This material combination is more durable than thermoplastic alternatives and approaches the performance of the Zoeller M98 at a lower price point.
The vertical float switch design provides on/off operation over approximately 4-6 inches of water level variation, similar to the Zoeller M53's tethered float. This moderately wide operating band prevents excessive cycling that would accelerate motor wear in high-frequency-activation applications like storm event pumping.
Comparison
| Model | Efficiency | Price | Key Spec | Warranty | Score |
|---|---|---|---|---|---|
| Wayne CDU980E | 77 GPM | 3/4 HP | $200–$320 | 3 years | ★★★★½ 4.6 |
| Zoeller M53 | 43 GPM | 1/3 HP | $250–$380 | 3 years | ★★★★★ 4.8 |
| Zoeller M98 | 72 GPM | 3/4 HP | $380–$500 | 5 years | ★★★★★ 4.9 |
Customer Reviews
Installed CDU980E units in four commercial sumps after our previous 1/3 HP pumps could not keep up with the building's groundwater inflow during heavy rain. The 3/4 HP units handle the peak inflow without running continuously. Cast iron construction has held up for two years without any issues. The price point is significantly lower than Zoeller commercial units with comparable flow ratings.
The CDU980E is my go-to for commercial sumps where flow rate matters. The 77 GPM at zero head covers virtually any commercial basement application. The cast iron construction gives clients the durability they expect for a commercial install. Wayne's parts availability through plumbing supply houses is good in my market — not quite as universal as Zoeller but sufficient for most service scenarios.
Solid pump for industrial floor drain sumps. The 3/4 HP handles our peak drainage load during production cleaning cycles. The stainless impeller has resisted the light chemical contamination in our sump water better than the plastic-impeller pump it replaced. Minor note: the float switch occasionally needed adjustment after installation — it was set slightly high from the factory.
Frequently Asked Questions
What is the flow rate difference between 1/3 HP and 3/4 HP sump pumps?
A typical 1/3 HP sump pump moves 40-45 GPM at zero head (e.g., Zoeller M53, Little Giant 553271). The Wayne CDU980E at 3/4 HP moves approximately 77 GPM at zero head. At 10 feet of head, a 1/3 HP unit typically produces 25-30 GPM versus the CDU980E's 55-60 GPM. For most residential sumps, 1/3 HP is sufficient. For large commercial sumps, basement parking, or properties with high sustained inflow, the 3/4 HP capacity is required.
How does the Wayne CDU980E compare to the Zoeller M98?
Both are 3/4 HP cast iron submersible sump pumps with similar flow ratings. The Zoeller M98 carries a longer warranty (5 years vs Wayne's 3 years) and Zoeller's reputation for reliability edges Wayne in contractor preference. The Wayne CDU980E typically costs 20-30% less than the Zoeller M98. For budget-sensitive commercial projects, the Wayne is a legitimate alternative; for critical applications where the pump failure cost is high, the Zoeller's warranty advantage is worth the premium.
What discharge pipe size does the Wayne CDU980E require?
The CDU980E has a 1.5-inch NPT discharge. At 77 GPM, a 1.5-inch PVC discharge line produces approximately 8-10 ft/s flow velocity — within acceptable limits. A 2-inch line is preferable for runs over 20 feet to reduce friction losses. A check valve within 12 inches of the pump discharge is required to prevent backflow.
Can the Wayne CDU980E handle sewage or dirty water?
No. The CDU980E is rated for groundwater sump applications with solids up to 1/2 inch spherical. It is not rated for sewage or effluent containing biological waste or large solids. For sewage applications, a dedicated sewage pump (e.g., Wayne RPP50, Zoeller 267) with larger solids handling capability is required.
What is the Wayne CDU980E warranty?
Wayne provides a 3-year limited warranty against defects in materials and workmanship. This is shorter than the Zoeller M53's warranty and significantly shorter than Zoeller's M98 (5 years). Wayne's warranty service is handled through their customer service network with replacement parts or pump replacement for covered defects.