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Nu Cobalt

731-i Automatic Pool Robot Wall Climber for Medium to Large In Ground Pools

  • Based on 74 reviews
Condition: New
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$329.95 Why this price?
Save $20.00 was $349.95

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Availability: In Stock.
Fulfilled by Amazon
Arrives Wednesday, Jul 23
Order within 16 hours and 28 minutes
Available payment plans shown during checkout

Features

  • No need to vacuum. Cleans and brushes floor and walls, revolutionary lightweight design, recommended for medium to large in ground pools up to 20 x 40 x 8' deep
  • Two hours timer with auto shut off. direct-drive motor for greater traction and serviceability
  • All surface cleaning for vinyl liner, fiberglass and concrete pools, quick-drain system for lightweight removal from pool
  • Extra-large pleated filter bag, 50' power cord with diagnostic NO-TWIST swivel, brush-to-port suction for thorough vacuuming of acorns, leaves and fine debris
  • One year limited warranty, ETL, CSA and CE approved

Brand: Nu Cobalt


Material: Cobalt


Color: Black


Power Source: Corded Electric


Hose Length: 15.24 Meters


Special Feature: Lightweight


Engine Type: Electric


Assembly Required: No


Control Method: Remote


Warranty Type: Limited


Load Capacity: 1E+1 Pounds


Efficiency: High efficiency, Cleaning Efficiency, Quick cleaning


Product Care Instructions: Wrap the cord neatly and store in a dry place. Regularly clean the filter bag and drain and store the product in a dry place to prevent damage.


Installation Type: plug-and-play" or "portable


UPC: 679042153946


Product Dimensions: 17.32 x 15.16 x 12.6 inches


Item Weight: 20.7 pounds


Manufacturer: Thunder Host Limited


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Jul 23

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
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  • Affirm Financing
  • Afterpay Financing
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  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Great scrubber and affordable
This pool cleaner definitely gets the job done and is affordable! We are very pleased with our purchase!
Reviewed in the United States on June 6, 2025 by debbie in illinois
    • Absolute garbage… do not buy
This product is absolute garbage. I had 2 of them and both had the same back right wheel break at the screw junction. And the track belts they use get destroyed by pool chemicals within a few months.
Reviewed in the United States on June 8, 2025 by James
    • Vacuum sucks in good way
After using this vacuum last summer and opening the pool last week still has not failed me but had a problem with the power cord the company sent me a new cord , this vacuum really sucks but in a good way and the company is the best to deal with
Reviewed in the United States on April 24, 2025 by Richard B.
    • Great Vacuum For The Price!!!
I have had this pool vac for a week now and so far it is amazing. It comes fully assembled except for plugging in the cords. They are color coded so as not to plug them into the wrong socket. The cord is on swivels so it never gets tangled or obstructs the unit from cleaning. It comes with a fine sediment filter and also a filter for large debris. Both are super simple to access remove and clean. No tool required. It has powerful suction to clean and climbs right up the walls to the waterline before reversing back down into the pool. Absolutely no issues with pool bottom pitch at all. This thing is a tank. My pool has never looked this clean. My feet can feel the diffrence on the bottom of the pool now that all the sand is gone. You cannot find any other unit for this price that cleans like this one does. If it stands up to time it will be a great unit. I will keep any changes posted as time goes by. ... show more
Reviewed in the United States on August 2, 2023 by Christopher
    • Do NOT BUY! It will not last.
Stopped working after 2 weeks. It was decemt when it worked.
Reviewed in the United States on June 19, 2025 by ɌΔ⟆ΓΞŊ
    • Outstanding Pool Cleaner
I have used about every type of pool cleaner available. Expensive suction driven unit that required replacement parts all the time, Kreepy Krawly knock off that lasted a year, and a battery powered robotic that couldn't climb walls. I took a chance with this unit even though it had some poor reviews. I'm surprised it isn't flying off the shelves at this price. It is comparable with units twice it's cost. Only drawback is cleaning the filters of which there are two. One for larger debris and one for finer debris. I haven't used the finer one yet, but am confident it will clean up the dead algae I have remaining in the pool. It's well engineered and a quality product. ... show more
Reviewed in the United States on August 2, 2023 by Rex G. Kunz
    • Beware
Have to give it two stars. Cheaply made, blue cable doesn’t stay connected in the socket. Will be asking for new cable. When it does run, it does a good job.
Reviewed in the United States on April 28, 2025 by Phil
    • Only worked about 6 times!
I bought this last year on July 3. So I used it maybe six times last summer. I just opened my pool for the summer and it doesn’t work. It turned on, worked for about 10 minutes and now there’s no power to it, I’m so disappointed! When it did work, I did a good job cleaning. I figured out the problem. The main power supply keeps shutting down every 3 minutes or so. I’m waiting to hear back from the supplier. I will give an update when I find out if the supplier will give me a solution. ... show more
Reviewed in the United States on June 6, 2025 by Sarah Dyer

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