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Internet # 203663675

Model # CDU800

1/2 HP Cast Iron Submersible Sump Pump with Vertical Float Switch

$158.78
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  • Pumps up to 5100 GPH at 0 ft.
  • Rugged, submersible cast iron base and metal construction
  • Top suction design filters debris and minimizes clogging
  • View More Details

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Product Details

About This Product

Wayne's CDU800 features a durable cast iron base and epoxy-coated housing for long life and quiet operation. This submersible pump is designed for small sump pits, as small as 11 in., the CDU series is one of the most popular replacement sump pumps in America. The ceramic mechanical seal assures long life in the most demanding applications and the 1-1/2 in. discharge allows easy installation. This powerful 1/2 HP sump, pumps up to 5100 GPH.

Highlights

  • Submersible cast iron and coated steel sump pump with vertical float switch
  • Top suction pump design eliminates air locks and clogging from debris in bottom of sump pit
  • Epoxy-coated steel motor housing and rugged, cast iron pump base
  • Fully submersible
  • 1/2 HP; max. flow rate is 5100 GPH; 3840 GPH at 10 ft. of discharge lift
  • 1-1/2 in. NPT discharge
  • For use in 11 in. Dia or larger sump basins; 9 in. on level and 4 in. off level
  • Assembled in the U.S.A.
  • Click here for more information on Electronic Recycling Programs
  • Return Policy

Product Information

Internet # 203663675

Model # CDU800

Additional Resources

Shop All Wayne

Specifications

Dimensions: H 14 in, W 10 in, D 10 in

Dimensions

Product Depth (in.)

10 in

Product Height (in.)

14 in

Product Width (in.)

10 in

Details

Amperage (A)

3.8 A

Cord Length (ft.)

8

Discharge Flow @ 0 ft. (gallons/hour)

5100

Discharge Flow @ 0 ft. (gallons/min)

85

Discharge Flow @ 10 ft. (gallons/hour)

3840

Discharge Flow @ 10 ft. (gallons/min)

64

Discharge Flow @ 15 ft. (gallons/min)

51

Features

Non-Clogging

Housing Material

Steel

Impeller Material

Plastic

Maximum Horsepower (hp)

1/2

Maximum Pressure (PSI)

11.03896104

Maximum Working Temperature (F)

120

Minimum Sump Basin Diameter

11 to 14

Minimum working temperature (F)

40

Outlet Diameter Connection (in.)

1-1/2 FPT

Pack Size

1

Product Weight (lb.)

18.5 lb

Pump Switch Type

Vertical

Returnable

7-Day

Switch-On Height (in.)

Medium (8-11 in.)

Vertical Lift (ft.)

10

Voltage

120v

Warranty / Certifications

Certifications and Listings

cUL Listed

Manufacturer Warranty

3

Questions & Answers

Outlet size
ByJun 3, 2026
1 Answer | 
Answer This Question

1-1/2 In. NPT Discharge for compliance with building codes

By|Jun 3, 2026


    The Wayne CDU790 manual says to replace the tether switch every 2 years. I'm confused as my unit has a float that rides up a metal bar, not a tether. It recently froze up and my FINISHED basement flooded. Does something on this unit I need to replaced?
    ByMay 1, 2026
    1 Answer | 
    Answer This Question

    Hello Scott Please Contact us at 8002370987. Your plumb does not have a teether float but we do recommend changing out the float switch about every to years as it is a wear and tare item.

    By|May 8, 2026


      How deep should the sup pump well be
      ByApr 17, 2026
      1 Answer | 
      Answer This Question

      Hello Brasiel, The recommend depth is 22 inches in depth.

      By|Apr 23, 2026


        Wayne user manual states the submersible sump pump is for indoor use only, seriously?
        ByApr 15, 2026
        1 Answer | 
        Answer This Question

        Hello, Thank you for your inquiry. This unit has been rated for safety standards for indoor use only.

        By|Apr 17, 2026


          Do I need a check valve for this particular pump? What is the thread size for the outflow?
          ByMar 6, 2026
          1 Answer | 
          Answer This Question

          Good afternoon, Check valves are required when installing a sump pump. Our discharge thread is 1 1/2 NPT. If you ever have any questions, or need assistance with anything, we’re here to help!

          By|Jun 21, 2026

            (1)

            will a 1" pvc pipe work for this?
            ByDec 26, 2025
            1 Answer | 
            Answer This Question

            Hello thank you for your inquiry, the smallest pipe size for this unit is 1 1/4 pipe.

            By|Jun 28, 2026

              (1)

              Would this be a good replacement for my sump pump that’s under my house in crawl space in a basin?
              ByNov 7, 2025
              1 Answer | 
              Answer This Question

              Hello thank you for your inquiry. As long as the pump is protected from the outside elements such as freezing temperatures, or debris going into the pit. This pump will be fine.

              By|Nov 7, 2025


                Is this the same as spf50
                ByOct 1, 2025
                1 Answer | 
                Answer This Question

                Hello no they are not the SPF50 is made with thermal Plastic where the CDU800 is made out of coated steel.

                By|Oct 6, 2025


                  Viewing 1-8 of 121

                  Customer Reviews

                  4.8 out of 5

                  • 4.8 out of 744 reviews
                  • 95% recommend this product
                  Filter by:
                  Showing 1-10 of 744 reviews
                  Yes, its installed in the space and works well.
                  by
                  Response from Wayne Water SystemsJul 15, 2026
                  Garl123- Thank you so much for your kind words and for taking the time to leave a review! We're thrilled to hear that you're happy with the quality of CDU790. We take great pride in offering products that meet high standards, and it’s wonderful to know that CDU790 met your expectations. Your feedback means a lot to us, and we’re grateful for your support. If you ever have any questions or need assistance with anything, we’re here to help!
                  I purchased a Wayne 1/2 hp cast iron submersible sump pump with vertical float switch. The pump was been installed for about one month and has been operating as expected. The pump seems solidly built and installation was straightforward. When its running, it operates quietly which is a benefit since our sump pit in the basement is located under the family room.
                  by
                  Response from Wayne Water SystemsMay 19, 2026
                  Hello Mike, Thank you for such a glowing review! We’re so happy to hear that you’re enjoying the quality of CDU800. We put a lot of effort into ensuring our products are made to last and provide value, so your feedback really makes our day!

                  If you ever need more information or have questions about any of our other products, feel free to reach out anytime. We’d love to have the chance to serve you again! Thanks again for your support!
                  So far very good. It was a replacement and worked flawlessly. It replaced my non submersible sump pump to eliminate another cutout for my radon mitigation sump basin lid.
                  by
                  Response from Wayne Water SystemsJun 9, 2026
                  Thank you for the 5 star review and positive feedback. If you ever need more information or have questions about any of our other products, feel free to reach out anytime. We’d love to have the chance to serve you again! Thanks again for your support!
                  • Verified Purchase
                  Exactly what I needed to replace an old sump pump. Perfect size for my sump pump basin. Good value for money.
                  by
                  Response from Wayne Water SystemsApr 15, 2026
                  HomeDepotCustomer - We truly appreciate your feedback and your trust in our products. Should you have any further questions or need assistance, we’re always here to help. Thanks again, and we look forward to serving you in the future!
                  Junk right from the box!
                  Junk! The pump ran for less than 30 seconds before it tripped my GFCI. Continue to trip every time I reset the GFCI. Outlet tested perfect and is less than a year old, and was installed by master electrician. And the fact Home Depot requires you to submit a photo with a review is stupid.
                  by
                    Received a broken sump pump
                    The pump delivered today but something fell off when I opened the package. I called customer service for replacement to be delivered tomorrow morning given that I have someone scheduled for installation. But I was told me that it is available at local store if I need it fast. I confirmed with customer service a few times whether it is available in the store because there is none when I ordered it. She is very sure that I can. Does lows will compensate the water damage and labor costs?
                    by
                      • Recommended
                      How does the song go, "seems it never rains in Southern California, but girl, let me warn ya, it ...
                      How does the song go, "seems it never rains in Southern California, but girl, let me warn ya, it pours, man it pours”. We can get a lot of rain when the storms roll through, and some of it was beginning to flood our backyard and patio. Did a lot of research on the best pump, and liked the construction details, production tests, and warranty for this pump. Using it for our backyard drainage, it didn’t need to be the largest, and it has proven itself to be perfect for my intended usage. I installed a collection box at what was the lowest part of our yard (also from Home Depot, U.S. TRENCH DRAIN 18”x14” Storm Water Pit and Catch Basin for Modular Trench and Channel Drain Systems with Aluminum Grate), an Everbuilt Sump Pump check valve, and then ran 1 1/2” ABS out to an ABS drain line under our driveway, and continued that run down slope to off the curb. Anchored this box deep down with 10” lag screws through the box sides sideways to eliminate potential for the box to be floated by water. Placed the pump inside, where fit and room was perfect. As stated, this pump works perfectly for its intended use. Rain water runoff accumulates quickly in the box, the float rises as it fills and in less than 2 seconds the box is emptied. Over and over and over. I have stood in the rain and watched it repeat this action effortlessly as the rain pours down. It’s a pleasure to watch a project succeed in its purpose, and have a dry patio. I have the pump plugged into a waterproof passthrough into the house, with a portable GFCI at the outlet. The pump is quiet, efficient, feels very well built, is solid, and has good heft. The most I have heard is a low hum when it activates. It has given us a lot of peace of mind now knowing that we won’t wake to a flooded patio when it rains heavily overnight. I realize we have only started the rainy season as of this writing, but right now I am very satisfied with this purchase.
                      by
                      • Verified Purchase
                      • Recommended
                      15 found this review helpful
                      Wouldn't recommend Wayne pumps if you want one to last more than a couple of years. Installed one...
                      Wouldn't recommend Wayne pumps if you want one to last more than a couple of years. Installed one of their 1/3 hp pedestal sump pumps a few years ago in my mothers basement. It lasted about 2 years before the shaft rusted to the cast iron and it stopped working. Replaced it with another brand and threw the Wayne off to the side until a few days ago when I brought what was left of it home so I could at least harvest the motor off of it and throw the rust pile away. Total JUNK!
                      by
                        12 found this review helpful
                        It's hard to rate something that you will depend on for long term durability when just installing...
                        It's hard to rate something that you will depend on for long term durability when just installing it. Just 4 stars for that reason. However, it was easy to install and is extremely quiet.
                        by
                        • Verified Purchase
                        • Recommended
                        4 found this review helpful
                        Great sump pump! I was amazed at how quiet it is. It has my recommendation
                        Great sump pump! I was amazed at how quiet it is. It has my recommendation
                        by
                        • Verified Purchase
                        • Recommended
                        2 found this review helpful
                        Showing 1-10 of 744 reviews

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                        Product Snapshot

                        Built for long-lasting durability and high performance in small sump pits.
                        Ideal for homeowners who want efficient solids handling, ensuring reliable, quiet sump pump operation.
                        Ideal for customers who want high-capacity pumping, ensuring a dry basement.
                        Ideal for homeowners wanting reliable backup pumping, ensuring peace of mind during power outages.

                        Pumping Capacity

                        5100 GPH
                        4080 GPH
                        6540 GPH at 0 ft. lift
                        2700 GPH

                        Horsepower (HP)

                        1/2 HP
                        1/2 HP
                        1 HP

                        Head Height

                        10 ft.
                        25 ft.
                        22 ft.
                        10 ft.

                        Automatic Operation

                        Backup Battery System