This lightweight stick vacuum boasts Dyson-like features for a quarter of the price

Ultenic U16 Flex Cordless: two-minute review

Ultenic has certainly upped the ante with the U16 Flex Cordless vacuum, launched in August 2024. As you may have already guessed from the name, the most notable feature is the U16 Flex’s flexibility. Thanks to a clever bendable elbow feature in its wand, this cool cordless does all the bending for you – making light work of pushing the floorhead deep under the furniture.

That's not the only feature borrowed from today's best cordless vacuums. The floorhead has 'GreenEye technology'; essentially bright green LED lights that help you track down less obvious dirt, dust and dander... as well as adding a bit of space-ship coolness. There’s a tangle-free roller brush that actually works, three power modes, six-layer HEPA filtration and a funky illuminated display panel that adds more spaceship vibes.

Operation is one-touch, by which I mean you don’t have to hold the power button in to keep it going, which is always a relief to my poor RSI-ridden hand. Ultenic promises the battery will last up to a full 60 minutes. I managed 54 in my tests, but that's still very respectable.

For all these features, you may well be expecting a price tag along Dyson lines, but perhaps the most astonishing aspect of the U16 Flex cordless is its price – if you shop smart, you can pick one of these little beauties up for under $200 / £200. It's absolutely one of the best budget vacuums I've tested.

I test it in out my four-bed home over the very busy Christmas and New Year holidays, and it did a sterling job on hard flooring (of which we have plenty). I loved how lightweight it was, and the power lasted plenty long enough to whip round downstairs before the next gaggle of guests descended.

However, there's one concession you'll need to make for that mind-blowingly bargain price. To get carpets clean, Normal mode won't cut it; you'll need to call on the maximum 'Turbo' mode. Unfortunately, the U16 can only manage 12 minutes of cleaning in this mode; not long enough to make it around my mostly-carpeted upstairs. So this one is only really suitable for people with mostly hard floors in their home.

Now you’ve read the short-and-sweet version, keep going to discover the full highs and lows of using this budget-friendly cordless in my full Ultenic U16 Flex Cordless review.

Ultenic U16 Flex Cordless review: price & availability

• List price: $219.99 / £219.99 (but discounted everywhere)
• Launched: August 2024
• Availability: US / UK

The Ultenic U16 Flex cordless vacuum is a straight-up bargain. If you’re on the hunt for a lightweight player without dropping a small fortune, this sleek little number is worth a look.

Officially, purchasing direct from Ultenic the list price is $219.99 / £219.99, which is in TechRadar's lower-mid price bracket for vacuums. However, at time of writing, it's discounted there and on Amazon, so you can expect to pay more like $150-$180 in the US, or £160-£170 in the UK. That's firmly in the budget bracket.

Sadly, Australians are out of luck because it’s not available there yet. But for everyone else, this vacuum delivers mid-range performance for a low-end price-tag. It’s got power, it’s lightweight, and it’s brilliant for getting into all those low-level nooks and crannies.

If you’re after a cordless vac that’s stylish, effective, and doesn’t leave you eating instant noodles for a month, the Ultenic U16 Flex has got your back.

• Value for money score: 5 out of 5

Ultenic U16 Flex Cordless specs

Ultenic U16 Flex Cordless review: design

• Lightweight, with flexible wand for getting under furniture
• Intuitive LED display and good bin capacity
• Slightly plasticky build quality

Landing on my doorstep in a compact box, with a fair number of plastic bags and foam padding, it wasn’t especially eco-friendly looking on the packaging front, but the Ultenic U16 Flex was very well protected. After pulling out and unwrapping all the elements, I found it was super easy to put together without any need to look at the quick setup instructions.

In red, black and a hint of purple, the Ultenic U16 Flex cordless vacuum gives me '80s throwback fear. The design has hints of early Dyson, too – that purple cyclone-like filter chamber looks very familiar. Overall, it's lightweight and easy to use; you won’t be breaking a sweat lugging it around.

The build quality feels a bit on the budget side – kind of plasticky and a bit clunky to connect the wand to the floorhead, but given the price that's not a dealbreaker. It's sturdy enough to get the job done without worrying it’ll collapse mid-clean.

The main design highlight for me was the flexible wand, which can be released to bend forwards. It's an idea borrowed from today's best Shark vacuums (like the PowerDetect Cordless), and a game-changer for reaching awkward spots – like under the couch where crumbs and dust bunnies love to party. It bends and twists like a pro, making those hard-to-reach areas not so hard-to-reach. Combined with the lightweight build and searing green LED lighting in the floorhead (this one inspired by the far-pricier Dyson V15 Detect and Gen5detect), it was perfect for quick zips around the house.

Oddly, the control panel isn’t nearly as sexy as the previous model, the slightly cheaper U12 Vesla (which I have also put through its paces) but it’s still nicely styled and techy-looking. There's one button for switching between power modes, so you don’t have to overthink anything while you're cleaning. Plus, the battery indicator is super clear – no guessing games about how much power you have left in the tank.

The main floorhead is solid enough, with decent swivel action that lets you glide around furniture. It's also shallow enough that it doesn’t get stuck under my sideboards, like competitors' models have. It only comes with one detachable crevice tool, but let’s face it, that’s the one we all use – I’ve got a cleaning cupboard full of weird and wonderful (and never used) nozzles from various ghosts of vacuums past. If you do need the gentler approach of a bristled nozzle, for furniture or upholstery etc, one slides out in handheld mode, which is handy because it’s always there, close to hand.

The Ultenic U16 Flex features a generous dustbin for the cordless sector, with a 95ml capacity. I could vacuum round our 4-bed home at least twice before needing to empty it, and given that we have two very hairy spaniels and two messy kids so that’s pretty impressive. When it’s time to dump the contents, the process is simple – just press the release button, and the lid flaps open. You can then empty it directly into the trash with minimal mess – and I never had to get my hands dirty digging out any stuck muck.

The Ultenic U16 Flex’s charging wall mount is space-saving and convenient. I didn’t fix it to my wall because it wasn’t staying, but I could check how well the vacuum slots in and out and always appreciate a mount where the charging is automatic once docked – no need to fiddle about manually inserting the charger port. If you prefer, you can also slide the battery out and charge it away from the vacuum, which would be handy if you don’t have a socket where you want to store your cleaner.

Overall, the U16 Flex is designed to offer everything you need, with a few cool extras on top. It might not feel as premium as some high-end brands, but nor do you have to sell a kidney to buy it.

• Design score: 3.5 out of 5

Ultenic U16 Flex Cordless review: performance

• Excellent maneuvering, and great on hard floors
• Easy to empty and clean
• Battery-sapping Turbo mode needed for carpets

Let me start by saying that the Ultenic U16 Flex cordless vacuum isn’t great on carpets. It’s not the worst I’ve tested, but if you have wall-to-wall carpets throughout and like to feel the power of dirt lifting through from the floorboards underneath, this is not the vacuum for you.

Those with mostly solid floors, like me, should keep reading, especially anyone who is really feeling the cost-of-living crisis right now (also me!). The Ultenic U16 Flex has three power levels: Eco, Normal (which is the default startup setting) and Turbo.

In Eco mode, which gives you the maximum battery life, it did a perfectly good job of sucking up dog hair, crumbs and small particles of dust/dirt from my solid floors (in the busiest rooms of our home: the open-plan kitchen, hallway and utility). However, it wasn’t great at dealing with bigger debris like hay and shavings (we have horses, and half the yard seems to come home via the kids’ socks). Normal was much better and so it was the mode I used most of the time on my hard floors.

On carpet I felt like I was wasting my time in Eco mode. Normal was okay, but I also had to call upon the battery-depleting Turbo mode for carpets. The vacuum only lasted around 12 minutes in Turbo mode. This was okay if I was only cleaning the downstairs, where there's just one room that's carpeted, and it's small. However, it wasn't long enough to clean the four carpeted bedrooms upstairs.

The Ultenic U16 Flex took a little longer than I’d expect to complete a full battery recharge – around four hours. I could have done with a spare battery to tackle upstairs though.

The real star of this vacuum, though, has to be the flexibility. The floorhead swivels and moves really smoothly and I can glide around my furniture without getting the floorhead stuck. I never felt like I was doing battle with the vacuum, and my hand/arm never ached, even when testing the battery to its maximum use in Eco mode (I clocked 52 minutes).

The flex wand is also a total game-changer. It bends low so I don’t have to, stretching under areas that I can normally only reach by getting down on my hands and knees. That almost never happens so it was quite satisfying/disturbing to see how full the bin got when I tackled under the island and kitchen sofa.

Plus, the attachments are really easy, if slightly clunky, to pop on and off. I’ve been using the crevice tool on the end of the long wand for the edges of my baseboards and getting cobwebs up high, and it worked perfectly – again without making my arm ache.

In handheld mode, the Ultenic U16 Flex really shines for quick and targeted cleaning jobs. It’s lightweight and easy to handle, making it perfect for tackling stairs, upholstery, or even light spills in your car (just don’t expect thorough detailing – for that you might need to invest in one of the best car vacuums).

With the crevice attachment, you can reach tight spots effortlessly, like between couch cushions or the corners of stair treads, without contorting into awkward angles or straining your wrists. In handheld mode, the suction is the best you’ll get from this cordless, easily picking up crumbs, and dust. I’d have like a mini upholstery head attachment, ideally with power brush, for really getting those deep-grained pet hairs out of my couch cushions though. TechRadar's best vacuum for pet hair list has some alternative suggestions here.

When it comes to noise, the Ultenic U16 is pretty average for cordless vacuums – not too loud but not super quiet either. In the lowest power it recorded 71 dB on my decibel meter app, in Normal it was 74 dB and in Turbo it went to 82 dB, which is comparable to a food processor or blender. It’s not silent, but it’s definitely quieter than I expected for the price. The good news was I could vacuum in Eco without making my spaniel bark his head off, which is a huge win and a rare feat. He still lost his cool when I dialed up to Turbo, though.

Suction tests

When I ran our standard vacuuming tests – one with flour to mimic fine debris, and another with oats for larger particles – the results were exactly as I’d anticipated. The Ultenic U16 did well on the hard floors and failed on carpets.

The flour test was completed on our engineered wood flooring, and I found I had to switch to Turbo mode to get the best results, but it only took two passes to achieve a clean strip of flooring.

Next came the oats test, again on engineered wood, and I was surprised to discover that I could get all the oats up as easily in Eco mode as I did in Turbo. In fact, the Ultenic U16 Flex made really light work of clearing away the entire spill, with a little help from the spaniels!

Moving into the snug to check out performance on carpet (a short-pile wool number), and the flour test was an absolute fail. Eco mode barely touched the flour and even in Turbo I had to do a bazillion passes and then call in the big guns (my Miele Duoflex cordless) to get the job done.

The oats test was a bit better on carpet, but I still had to spend a lot of time going back and forth over the same spots. Then I had to get the crevice nozzle out to suction up the strays that had snuck into the threshold joint. I nearly ran out of power before my carpet was clean again.

Maintenance

I found the Ultenic U16 easy to clean and maintain. The bin pops open really easily and empties straight out – no fishing about with sticks to unblock clogs. The HEPA filter is also simple to access, which is a bonus for those who hate vacuum maintenance.

You just detach the dustbin by pressing the release button and the filter is easy to spot and pull out. Wash it under a running tap and leave to dry – there’s a spare so you’ll always have a dry one to hand. Another bonus of this cordless is the hair-evading brush in the floorhead, which didn’t get wrapped in any hair, string or random threads during the entire test period.

• Performance score: 3.5 out of 5

Ultenic U16 Flex Cordless review: battery

• Battery lasts 12 mins in Turbo, 52 mins in Eco
• 4 hours to fully recharge the battery
• Removable and swappable battery

The Ultenic U16 Flex provides a practical balance between performance and battery life, especially in a home with mostly solid floors like ours. In Eco mode, the vacuum lasted a generous 52 minutes. That's not quite as long as the hour promised by Ultenic, but it's still plenty of time to tackle everyday messes in busy areas like my open-plan kitchen and hallway.

Most of today's best cordless stick vacuums will offer a maximum of 50 or 60 minutes' of cleaning (and a couple offer up to 70 minutes), although of course the suction in that mode will vary from model to model.

In Turbo mode the battery lasted just 12 minutes. It's not unusual for a stick vacuum's maximum suction mode to drain power that quickly, but the fact I had to use Turbo mode quite a lot when tackling carpets wasn't ideal.

Recharging takes around four hours. The U16's battery is removable and spares can be purchased if you want to extend the cleaning times further.

• Battery life score: 3.5 out of 5

Should you buy the Ultenic U16 Flex Cordless?

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How I tested the Ultenic U16 Flex Cordless

I tested the Ultenic U16 Flex cordless vacuum for four weeks during the festive season, during which we hosted far too many family gatherings than was good for our livers, and a child’s birthday, too. Our home is a Victorian, four-bed detached property that is mostly open-plan downstairs. We don’t have any thick-pile carpet, but we do have virtually every other type of flooring – porcelain, terracotta, luxury vinyl, engineered oaks, wool carpets and lots of flatweave rugs. I used this cordless as the only vacuum during the testing period, in every room and up the stairs, checking out the various attachments as I went. I also conducted controlled tests using flour and oats on hard floors and carpet, monitored the sound levels using an App on my iPhone and timed battery use and charging.

Read more about how we test vacuum cleaners.

First reviewed January 2025