Nu Cobalt 731-i Automatic Pool Robot Wall Climber for Medium to Large In Ground Pools
Condition: New
Buy Now, Pay Later
As low as
/ mo
Learn more
- – Up to 36-month term if approved
- – No impact on credit
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Free shipping on this product
Extended holiday returns
FREE refund/replacement until Jan 31, 2026 Learn more
FREE refund/replacement until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2026
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Friday, Dec 19
Recently Viewed
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
Model Name: 731-i
Material: Cobalt
Color: Black
Power Source: Corded Electric
Hose Length: 15.24 Meters
Special Feature: Lightweight
Assembly Required: No
Control Method: Remote
Warranty Type: Limited
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:
Friday, Dec 19
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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- PayTomorrow Financing
- Financing through Apple Pay
Learn more about financing & leasing here.
Similar Products
Top Amazon Reviews
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
Stopped working after 2 weeks. It was decemt when it worked.
Reviewed in the United States on June 19, 2025 by ɌΔ⟆ΓΞŊ
I've already recommended this pool cleaner to my neighbors. I've had 3 others over the past 12 years. This is not very expensive compared & way better than ALL the others I've tried. The bag filter has 7 pockets with really trap & hold: leaves sand dirt even algae. It takes some effort to clean but it's worth the effort & it cleans my pool fantastically! Super happy. Also it seems to be really well designed & built & manufactured.
...
show more
Reviewed in the United States on August 1, 2024 by LoyalFriend
I am so glad I purchased this cleaner! Took it out of the box and put it to work. Our pool is sloped with crevices and this guy cleaned every inch. Climbs the walls up just past the water line where you can hear and see the suction power. The product description didn't show that the cleaner comes with a fine filter and the bag filter. The fine filter worked great and was easy to clean. My previous cleaner was cordless but couldn't climb the walls. The cord was no problem, didn't tangle, and was easy to put away. For the price I think this cleaner is a superior value to the other more "well known" cleaners.
...
show more
Reviewed in the United States on October 12, 2022 by Jeff
Cleans very well, but has a random pattern. It's fairly hard to clean the robot out when done. I would have loved it, but my pool liner tore (not the robot's fault) and I won't be using it again.
Reviewed in the United States on September 9, 2025 by Larry Elie
When this robot worked , it only worked for roughly 3 months. First, it broke a wheel and Nu Cobalt sent a replacement wheel. This suggests shotty quality. I sent a communication to Nu Cobalt. Nu Cobalt responded and sent the replacement parts I need. There were no directions and I also noticed the treads are pretty worn for a robot that is only three months old. Then, 2 weeks later, it just died. Power supply flashes purple. Robot doesn't move. If you are looking for quality, it isn't with Cobalt. I've reached out to the seller asking for a refund or a new unit. They will not do anything unless I pay to ship this useless waterweight back to them. I am out $600 and Nu Cobalt doesn’t seem to care. Luckily, Amazon made it right and I was able to get my money back no thanks to Nu Cobalt. Skip this robot. Buy from a more reputable manufacturer who will make a product that lasts more than four months and back that product up when it fails on you. Caveat Emptor.
...
show more
Reviewed in the United States on December 7, 2022 by Nick Nick
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
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