WAYNE CDU800 1/2 HP Submersible Sump Pump - High Capacity Quiet

In this review of the WAYNE CDU800 1/2 HP submersible sump pump, the bottom line is straightforward: this is a workhorse for homeowners who need reliable, high-flow basement protection without constant attention. Built with a cast-iron volute and epoxy-coated steel housing, the CDU800 is intended for indoor sump pits 11' in or larger and delivers up to 5,100 GPH, making it an obvious choice when strong continuous pumping and long-term durability are priorities.

Key Features

• High Flow Capacity: Pumps up to 5,100 GPH, which handles heavy inflow from rain or snowmelt and reduces the chance of overflow.
• Durable Construction: Cast-iron volute, corrosion-resistant epoxy coated steel motor housing, and stainless steel fasteners extend service life in tough sump environments.
• Top Suction Design: The top suction eliminates air lock and helps minimize clogging from debris that settles in the bottom of the pit.
• Reliable Float Switch: Integrated vertical float switch tested to 1 million cycles for long-lasting automatic on/off operation without extra controls.
• Code-Compliant Discharge: 1-1/2 NPT discharge matches common plumbing codes and simplifies installation to existing pipework.
• Quiet, Indoor Operation: Designed for indoor use only and noted by owners for quiet running compared with lighter plastic pumps.

Who It's For

The CDU800 is best for homeowners with basements or crawlspaces who need a dependable, high-capacity sump pump for frequent or heavy water events and who prefer a rugged metal-bodied unit over lighter consumer models. It is also a strong choice for anyone who values a tested vertical float switch and top-suction design to reduce clogging and maintenance.

Customers who should look elsewhere include those needing outdoor or portable pumps or those with very small sump basins under 11' in diameter. Also consider a smaller, lower-capacity or battery-backup model if occasional, light seepage is the only concern.

Pros & Cons

Pros

• High pumping capacity handles heavy runoff and prolonged events.
• Robust cast-iron and coated-steel construction for long-term durability.
• Top suction and proven float switch reduce clogging and offer reliable automation.
• Generally quiet operation reported by owners, suitable for indoor basements.

Cons

• Intended for indoor use only, so not suitable for outdoor or portable applications.
• Heavier metal construction makes it less convenient to move compared with lightweight plastic models.

Specifications

Model	CDU800
Motor Power	1/2 HP
Maximum Flow	Up to 5,100 GPH
Sump Basin Size	11' diameter or larger
On/Off Levels	9' ON, 4' OFF
Discharge	1-1/2 NPT
Construction	Cast iron volute; epoxy coated steel housing

Our Verdict

The WAYNE CDU800 is a solid, cost-effective choice for homeowners who need a durable, high-capacity indoor sump pump. Its metal construction, top-suction design, and long-lived vertical float switch make it a dependable option that offers excellent value for heavy-duty basement protection, provided an indoor installation and the heavier weight are acceptable tradeoffs.

Frequently Asked Questions

Is the CDU800 suitable for small sump pits?
The pump is intended for sump basins 11' in diameter or larger; it may not fit or operate properly in smaller pits.

Can this pump be used outdoors?
No, the CDU800 is rated for indoor use only and should not be installed outdoors.

How reliable is the float switch?
The integrated vertical float switch has been tested to 1 million cycles and is built for long-lasting automatic operation.