WAYNE CDU790 1/3 HP Submersible Sump Pump - Quiet, Durable Performance

In this review the WAYNE CDU790 1/3 HP submersible sump pump is assessed for homeowners who need a dependable basement pump capable of handling heavy water flow. The bottom line: this pump is best for property owners who want a rugged, quietly running unit that can move large volumes of water quickly and resist corrosion over time. Its strongest single advantage is the combination of a powerful 1/3 HP motor and a cast iron construction that delivers up to 4,600 GPH while staying relatively quiet and clog-resistant.

Key Features

• High flow capacity: The 1/3 HP motor can pump up to 4,600 GPH at 0', which moves large volumes of standing water quickly during heavy rain events.
• Durable construction: Cast iron base with epoxy-coated steel motor housing and stainless steel fasteners provides corrosion resistance and long service life in sump applications.
• Top suction design: The top suction intake helps minimize clogging from debris at the bottom of the sump pit and eliminates air lock problems.
• Integrated vertical float switch: The vertical float switch is designed for long life and has been cycle-tested for extended durability, reducing the need for frequent replacement.
• Code-compliant discharge: The 1-1/2 NPT discharge fits common plumbing and meets building code expectations for many installations.
• Ease of installation: Compact top-suction layout and a carry handle make it straightforward to set up in an 11 in or larger basin with minimal plumbing changes.

Who It's For

The WAYNE CDU790 is ideal for homeowners with basements or crawlspaces that are prone to significant water intrusion from heavy rain or snowmelt who want a durable, high-capacity sump solution. It suits anyone who values quiet operation and robust materials over a lightweight, temporary utility pump.

Those who should look elsewhere include people needing a portable, lightweight utility pump for intermittent outdoor use or projects with long-distance lift requirements beyond the CDU790's intended basement sump application. For smaller clean-up jobs or where portability and a long power cord are the priority, a compact thermoplastic utility pump may be a better match.

Pros & Cons

Pros

• Very high pumping rate that clears basins quickly during heavy inflow.
• Solid cast iron and epoxy-coated construction that stands up to demanding environments.
• Top suction and float guard design reduce clogging and switch hang ups, improving reliability.

Cons

• Designed for indoor sump use only, so it is not suited for outdoor or temporary utility tasks.
• Cast iron construction adds weight, making it less convenient to move than lighter thermoplastic pumps.

Specifications

Brand	WAYNE
Motor power	1/3 HP
Maximum flow	Up to 4,600 GPH at 0'
Discharge size	1-1/2 NPT
Intake design	Top suction for reduced clogging
Construction	Cast iron base, epoxy-coated steel housing, stainless steel fasteners
Minimum basin diameter	Designed for 11 in or larger sump basin

Our Verdict

The WAYNE CDU790 is a strong choice for homeowners who need a permanent, heavy-duty sump pump that prioritizes flow rate, durability, and quiet operation. It offers solid long-term value for basement protection thanks to cast iron construction, a reliable vertical float switch, and a clog-resistant top suction design. Choose this model when performance and longevity are more important than light weight or outdoor portability.

Frequently Asked Questions

Is this pump suitable for outdoor use?
The CDU790 is designed for indoor sump basin use and is not intended as an outdoor or temporary utility pump.

What size basin is required?
Wayne designed this unit for use in 11 in or larger sump basins to allow proper installation and top-suction clearance.

Does the pump resist clogging?
The top suction design and float guard help minimize clogging from debris and reduce the chance of the switch hanging up.