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Ecovacs Deebot N79S Robot Vacuum Feels Like the Future

Robot vacuum cleaners may seem like futuristic technology to many of us, but they’ve been around since 2002, starting with iRobot’s Roomba. When the Ecovacs Deebot N79S went on sale for $180 recently—it usually sells for $250—I hopped on the figurative flying car. Now that I have one, I’m wondering how my family survived so long without it.

The Deebot N79S is a round disc on wheels that weighs about 5 pounds (2.34 kg). It’s roughly 12.5 inches (32 cm) in diameter, and is about 2.25 inches (5.7 cm) tall, making it low enough to slide under many pieces of furniture, including most chairs, some coffee and end tables, and some couches. The Deebot N79S is a newer and slightly more advanced version of the Deebot N79 with a more-powerful cleaning option that I never use and Alexa support that’s basically pointless. I refer to them interchangeably here unless I mention an N79S-specific feature.

Why did I choose a model from Ecovacs, a relatively unknown company, over one of the more well-known Roomba models? Even at its list price of $250, the Deebot N79S is cheaper than the low-end Roomba 690, which goes for $300 on Amazon, and the Deebot N79S is often on sale for under $200. The Deebot N79 is a little cheaper yet, and it too often receives discounts that drop its price well under $200 on Amazon, making it one of the cheapest robot vacuums on the market. Despite the low cost, the Deebot N79 is Wirecutter’s current top pick for a robot vacuum.

Wirecutter thinks that the Roomba 690 will likely last a few years longer, due to a more proven design. That’s something to consider if you’re in the market for a robot vacuum, and if the price delta is only $50 when it’s time to buy, you should look at the Roomba. But if you can pick one up for as low as $150, the Deebot N79 is a steal.

Price is one reason many people never give a robot vacuum a chance. Before the Deebot, the typically recommended Roombas were $300 or more, and a decent canister or upright vacuum could be had for $150 or well under that. It’s also hard not to be skeptical of the technology in general. Vacuuming by hand is tricky enough—making sure you’re not sucking up things you shouldn’t, moving chairs and rugs out of the way, and navigating tight spots—that I didn’t think a robot could handle the job. Surely the people who loved these machines didn’t have children or pets, and were somehow capable of keeping their floors free of junk and debris.

So how does it work?

AI and Engineering

I must say up front that watching Deebot N79S will drive you bonkers. It goes over the same spot repeatedly, gets stuck in a makeshift obstacle course that wouldn’t even slow down a self-respecting rat, and wanders the entire house trying to find its charger when it’s a foot away. Is this how managers of the future will feel watching their robot employees work?

The Deebot’s AI may rely on a path-planning algorithm that seems dumb—it’s highly intentional, in fact—but the engineering behind the Deebot is smart. Two long spinning brushes on opposite sides of the typical vacuum brush roller help sweep dirt into the robot’s mouth, which helps maximize how much dirt it picks up. Anti-collision and anti-drop sensors keep it from slamming into walls and other objects, or, as you can see in my short video, from careening down the stairs.

One of the best little bits of engineering in the Deebot is its suspension, which lets the robot body easily navigate small changes in height or pick up larger objects. My son has a Nerf obsession, so I often find several darts when I empty the Deebot’s dustbin.

For the most part, it also transitions well from hard floors onto carpets and vacuums them without much fuss. Be aware that the Deebot is intended only for hard floors and short carpet. Shaggier carpets can bog the Deebot down, though it works acceptably on the medium-plush carpet we have upstairs.

I’m especially impressed with how well it handles lightweight bathroom rugs, which are nearly impossible to clean with a traditional vacuum. It does sometimes get stuck trying to suck up the corner of a rug, but those rugs are still getting vacuumed more than they would otherwise.

Overall, though, the Deebot gets the job done. After letting it work for a few days, the house is visibly cleaner and there is less observable dust in the air. I haven’t felt the need to pull our old vacuum cleaner out of the closet for the past month.

Running the Hoover

Using the Deebot is as simple as pressing its single button, labeled Auto. The Deebot starts vacuuming, and about 2 hours later, when the battery is low enough, it makes its way back to its included charging dock and prepares for its next cleaning session.

The first thing to figure out is where to place that dock. Putting it under a tall, wide chair confused the Deebot, so I instead opted for a fairly open corner in front of a bookcase. The reality is that the dock will probably be in your way, because it needs to be easy for the Deebot to find.

The Deebot dock

Needless to say, the Deebot can’t navigate stairs, so if your house has multiple levels, you’ll need to move it manually or consider purchasing one for each floor. The Deebot is light enough that I just haul it upstairs every few days to vacuum our low-traffic bedrooms. As the video above shows, it’s good about not plummeting to its doom. Unfortunately, it won’t do anything to keep your stairs cleaner, so that’ll be one place you’ll still have to vacuum by hand.

The Deebot may have only one button on the unit itself, but it has a remote with many more. You only need the two at the top—the Auto button and the other one to return the Deebot to its base.

The Deebot remote control.

Using the remote, you can enable a variety of modes for spot cleaning, cleaning a single room, and cleaning the edges of a room, the last two of which are largely unnecessary. If I want to clean just a single bedroom, I put the Deebot down, press Auto, and shut the door on my way out. When I come back a few hours later, the floor is clean.

Spot cleaning is more useful, in case you spill something in the middle of a large room that’s otherwise clean, or you can use the remote’s directional buttons to take manual control. That capability came in handy the other day when I accidentally tracked freshly cut grass into the kitchen and didn’t feel like pulling the big vacuum out of the closet, unwinding the cord, finding an open outlet, and putting it all back when I was done.

The Ecovacs iOS app is best described as “adequate,” mostly because it’s painfully slow, taking up to a minute to connect to the vacuum. I can’t recommend it generally, but it has a few uses:

  • Viewing error messages when something goes wrong.
  • Programming a schedule, though this can also be done via the remote.
  • Checking the estimated remaining lifespan of consumables such as the paper filter.
  • Adjusting the suction power of the vacuum on the N79S. There’s no reason to do this because it shortens the battery life so much that the increased suction makes no difference in the eventual amount of dust collection.

The best way to set up the Deebot is to give it a schedule and just let it do its thing. I let mine run at 7:15 AM every weekday, just after my wife and son have left the house. At 64 decibels, it’s relatively quiet, but you won’t want to run it when you want silence.

If you work outside the home, you will likely want to run the Deebot while you’re away, but that can be a mixed bag. I often turn it on when I’m heading out the door, and most of the time I come back to it having done its duty and returned to the charging dock. (It’s unfortunate that it doesn’t support HomeKit, because then I could set it to start cleaning when I leave the house and stop when I arrive home.) Most days, the Deebot needs no assistance, but sometimes I get home to find it hung up. It can have trouble with:

  • Window shade cords, power cords, or any sort of string that can get wrapped around the Deebot’s roller
  • Objects of a certain size—my 4-year-old once spread a bunch of small screwdrivers on the floor, and that really tripped the Deebot up
  • Lightweight rugs that can bunch up under the Deebot, especially if they have tassels or frayed edges

Happily, all of these little things are easy to fix. The bad news is, if you’re not home to do so, these errors can seriously cut into your automated cleaning time.

Regular Maintenance

Most of my active time with the Deebot is in doing some basic maintenance to keep things running smoothly. These tasks include:

  • Picking up small objects that will give the Deebot a hard time, like cords, small screwdrivers, and other things small enough to get sucked into the Deebot but too big to be captured successfully. Your floor doesn’t have to be perfect—the Deebot successfully navigates around all sorts of junk in our house.The Deebot negotiating a tight spot under a table
  • Picking up rugs that I know will give Deebot trouble or tucking in frayed edges. I don’t even need to do this much; the Deebot seems to figure out how to avoid these.
  • Wiping down the sides of the Deebot every few days to keep the sensors clean. If they get too dirty, the Deebot can stop working entirely.
  • Emptying the dustbin every day, and cleaning the filters every few days. These are the most important tasks.

Even cleaning the entire system takes no more than about 5 minutes. I dump the dustbin in the trash, remove the paper high-efficiency filter and shake it out, and rinse the sponge filter and filter net under a faucet. Ecovacs also recommends cleaning the brushes, but I do that only when there’s a problem. I then dry the sponge filter and filter net with a paper towel and let them finish air-drying. Sometimes I rinse out the dustbin, but if it’s not too dirty, I just wipe it out with the damp paper towel.

The Deebot comes with a neat little cleaning tool with brushes and various implements to remove tangles. The main tangle cutter is basically a letter opener—I wish I’d thought of that before for removing hair from our old vacuum’s roller.

Ecovacs recommends replacing the paper filter every 4–6 months, which seems reasonable. But the company also recommends replacing the side brushes twice per year and the main brush once every year. That seems wasteful, but we’ll see how they hold up.

Rosie the Robot

I’ve been writing about home automation gizmos for a while—I even wrote Take Control of Apple Home Automation about the topic—but the Deebot is the only one that continually amazes me on a daily basis. Robot vacuums aren’t at all new at this point, but there’s something about the physical nature of it that makes it feel futuristic. Maybe that’s due to all the time I spent watching The Jetsons as a kid.

Speaking of that futuristic element, I would be remiss if I didn’t at least mention the Deebot’s Alexa integration. It’s mostly a gimmick because you’re better off setting a schedule, but it works well enough. I can say to my Ecobee thermostat: “Alexa, tell Deebot to start vacuuming” or “Alexa, tell Deebot to charge.” and it will do so (see “A Prairie HomeKit Companion: The Ecobee 4 Thermostat,” 20 April 2018). Something about talking to my thermostat to control my vacuum greatly amuses me. Voice control may not be particularly useful when it comes to cleaning the carpet, but it’s a reminder of how far we’ve come from the days of scrubbing the floor on hands and knees.

Gimmickry aside, the Deebot N79S is a legitimately useful gadget, and if you’re unhappy with the amount of time you spend vacuuming your house, and particularly if you’re in the market for a new vacuum anyway, check it out.

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Comments About Ecovacs Deebot N79S Robot Vacuum Feels Like the Future

Notable Replies

  1. I have the Eufy RoboVac 11 and it’s surprisingly identical! The only issue I’ve had is the remote went out after a couple months and they refuse to replace it. Apparently their warranty only extends to products bought directly from them or their partners which frankly stinks to high heaven!

  2. Regarding cords, rugs, etc., I find that I move very little that I wouldn’t move anyway to clean with an upright vacuum. I flip some ottomans up onto their chairs, just to reduce the number of obstacles to be avoided.

    The great part is that after the very brief prep time, I can go off and do something else, and just check in once in a while to make sure the little robot hasn’t gotten stuck somewhere. That is, when I don’t get mesmerized, watching it work!

    " Rosie the Robot": I call mine “Deebot Chopra.”

  3. I bought a Deebot M80 Pro from Amazon last summer during one of the sales. The M80 is like the M79 but includes a water reservoir and wet cleaning pad so you can damp mop your floor.

    Do not get the mop version. Or at least don’t pay for it. I found it’s useless because it doesn’t clean anything. The reservoir only holds 90 mL of water, and Deebot insists you only use water. Otherwise they say you’ll clog the water outflow from the reservoir. The wet cleaning pad is not disposable and gets dirty right away. When I gave up on damp mopping, I tried filling the reservoir with dilute Windex to see if that helped. It still couldn’t clean my floor. Useless.

    Without trying to damp mop I’ve come to love the Deebot. My experience is pretty much just like Josh’s, except for two things. First, it will snag itself on almost anything and then shut down. I had to learn how to “childproof” the area to be cleaned so it could do its job. But it will still wedge itself under furniture and quit. Second, the suction and carpet-beating brush aren’t nearly as strong as an upright vacuum. So you still have to use a normal vacuum cleaner to remove the deep, ground-in dirt, but not nearly so often as before. Maybe just once a month or two.

    By the way, iRobot makes a dedicated little damp mop cleaner called the Braava Jet 240. It was also useless, didn’t clean anything, and I returned it.

  4. I ordered the N97S as soon as I read this glowing review. Should get it tomorrow with one day shipping. I can’t wait to see how my miniature schnauzer, Willy, reacts to this gadget. Practically speaking though, dragging out the upright is not done enough here so I’m hoping this will correct that. Besides, it’ll be kinda fun.

  5. I hope you love it! Let us know either way.

  6. I’ve been a Roomba user for 15 years or so, and the stairs are definitely one part of the house a robot vacuum can’t handle. But instead of pulling out a “classic” vacuum, I grab a broom. A minute or two of vigorous sweeping from top to bottom gets everything from the carpeted stairs onto the landing at the bottom, which the Roomba can handle.

  7. Does anyone know if the Ecovacs detect and avoid animal poop? If one of my cats poops on the floor I don’t want to discover the next morning it smeared everywhere.

  8. No, it will not, and that’s apparently a big issue with these robots. Wirecutter says that a new model is coming up that supposedly avoids dog poop. I’ll believe it when I see it.

  9. It will be yet another task robots can perform better than humans, at least this human :wink:

  10. The Deebot vacuum arrived yesterday. After charging the unit I was pleased that there were no problems encountered in any way. I was also pleased that the unit recognized the two stairways and immediately backed away. We have the charging dock in a rather difficult spot so I’ve had to guide it back home with the remote control. Need to find a better location.

    Willy, our schnauzer, immediately decided he needed to inspect this intruder. My son shot this 50 second video.

  11. After we published my review, the good folks at Ecovacs sent me a Deebot 901 to review. I had high hopes for it, and was encouraged when I unboxed the 901. In terms of materials, it’s superior to the N79S in every way: the plastic is higher quality, it has more sensors, the unit is heavier, and even the power cord is thicker. When I first ran it, my wife immediately noted that the 901 is both faster and quieter than the N79S.

    Instead of randomly bouncing around the house, the Deebot 901 maps out your house and tries to intelligently navigate. The upside is that it creates a neat video-game-esque map of your house. The downside is that it doesn’t work well at all.

    The strangest behavior seemed reserved for my TV room. The Deebot would often avoid the room or just barely vacuum in there. If I picked the thing up and placed it in the TV room, it’d vacuum for a minute before declaring that the clean is complete (oh, this one talks BTW). On two occasions it declared the clean was complete and docked in an imaginary docking station in my TV room (the actual docking station is two rooms away).

    I tried resetting the map, but it didn’t help much. At least it would clean in my TV room, but it still behaved strangely. Here’s a YouTube video of the Deebot 901 actively avoiding a spot of dirt in my TV room:

    Unfortunately, unlike the N79S, you cannot steer the 901 with a remote control, as it doesn’t include one. Nor does the app allow manual control. The software maps out the rooms in your house and assigns a letter to each one. You can assign specific rooms for the 901 to vacuum, but you can’t take control of the N79S and make it clean the specific spots you want it to clean.

    I can’t recommend the Deebot 901. You’d be forgiven for assuming that it’s just a better version of the N79S, and in many ways it is, but it flops on the software side. Sometimes stupider is smarter.

    Instead of the Deebot 901, I would recommend buying two Deebot N79S vacuums instead.

  12. I’ve been pretty happy with our N79s since it arrived at our house a few weeks ago. First time I ran it in our living room I was surprised and embarrassed at how much it picked up. It does have a bit of trouble finding its charging station because that is behind my chair in the tv room. Last time though it found its home fairly easily after several tries. My schnauzer Willy just ignores it now.

  13. Glad you’ve had a good experience!

  14. I put the Deebot 901 upstairs for a few days to see how it would perform up there. It did surprisingly well. The sturdier build of the 901 did a better job of cleaning the carpet than the N79S. Granted, the upstairs is much smaller and simpler than downstairs, so there weren’t as many variables to confuse the 901.

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