The Roomba Plus 415 Combo is a genuinely good robot vacuum cleaner trapped inside a machine that can’t see where it’s going – this is everything you need to know

As a home tech reviewer, I've spent the best part of a decade testing appliances out in my home. And I've had the pleasure of taking some of the best robot vacuum cleaners out for a test drive.

Recently, I got my hands on the iRobot Roomba Plus 415 Combo, and it's a strong cleaner but a poor driver. Of course, which of those observations you care about more depends entirely on what kind of home you keep. So, this is everything you need to know.

In a nutshell

The 415 sits at the entry point of the new Roomba Plus range, vacuuming and mopping in the same run, with an AutoWash dock that empties the bin, washes the pads, and dries them with warm air at 45°C. Suction is quoted at 20,000Pa, which iRobot says is 2.8 times that of the older Roomba 505, though the number is less important than the two DualClean pads spinning at 200 RPM underneath.

ClearView LiDAR handles navigation, and the map-building is quick, with the resulting plan coming out pretty accurately. Sadly, there's no camera-based obstacle recognition at this tier, and after a day of watching it drag a cat toy into the hallway, that omission is my defining impression of the machine.

In fact, I've learned that there is a specific noise a robot vacuum makes when it detects a charging cable and mistakes it for a rug. A rising whine, then the sound of furniture scratching and, in the worst cases, ornaments dropped to the floor as a table falls over. I heard it three times in the first hour with the Roomba Plus 415 Combo, which is a shame because between those moments it did some of the best floor cleaning I've had from a robot in this end of the market.

​The dock is the other thing worth discussing, mainly for what it isn't. At 33 x 33 x 48.5 cm, it takes up roughly half the floor of the MOVA P50 Pro Ultra I tested in the same flat a few weeks ago, and it went into its corner without anything else having to move. Anyone who has tried to house a self-washing dock in a small flat will understand why that's such an important detail.

Specifications

• Suction power: 20,000Pa
• Mop function: Yes
• Pad lift: 10mm auto-lift on carpet detection
• Navigation: ClearView LiDAR
• Multi-floor mapping: Yes, up to 3 maps
• Dock functions: Auto-empty, pad wash, 45°C heated drying, self-cleaning cycle
• Dust bag: AllergenLock, up to 3 months
• Cleaning modes: Vacuum only, mop only, both together, vacuum then mop
• Robot dimensions: H8.35 x W30.3 x D29.8cm, 2.9kg
• Dock dimensions: H48.5 x W33 x D33cm, 5.3kg
• Compatible with: Roomba Home app, Alexa, Siri, Google Assistant

How I tested

Caroline Preece

Caroline is a Freelance Journalist who has been testing home tech and appliances for over a decade. She tested the Roomba Plus 415 Combo in her one-bedroom basement flat in Ipswich, which has laminate wood flooring throughout, vinyl in the kitchen and bathroom, several rugs of varying pile, a layout that confuses visiting humans, and one all-black cat.

Unboxing, setting up and first impressions

The packaging consisted of too much cardboard and more plastic than I'd like to see in 2026, but that’s not a knock on iRobot specifically.

The cardboard at least goes out with the paper, but the dock arrives inside a full plastic sleeve, and the smaller parts each get their own compartment on top of that. I've said this about every robot vacuum I've tested, and I'll keep saying it.

What's inside is better organised than the outside suggests. A quick start guide, the dock, the robot, clean and dirty water tanks, an edge-sweeping brush, two pairs of mop pads, a spare AllergenLock bag, and both UK and US power leads.

Assembly is where the price shows itself. Everything goes together, but nothing clicks, and the way the panels sit feels flimsy, making me double-check that I'd done it right. Sliding the dock into its corner, I spent most of my energy making sure I didn't knock the water tanks off the top, which may only be a problem on the first day, but it didn't inspire much confidence.

It did, however, pass the test I apply to everything that arrives in a box: whether I can set it up without reading the instructions. The dock is intuitive, the pads only fit one way round, and the app takes over from there.

The robot itself is nicer-looking than most. There's a faux fabric patch across the top and a minimal set of buttons, which is a welcome change from the glossy black plastic discs that make up most of this category. It looks like something that belongs in a room rather than something you'd hide in a cupboard.

One absence I noticed straight away is that there's nowhere to add detergent. Other models have an auto-dosing compartment that meters cleaning solution into every run, but the 415 washes with water alone. It’s not a dealbreaker, but it's worth knowing about if you're used to a floor cleaner that also leaves a smell afterwards.

Ease of use

The Roomba Home app is clean and user-friendly, and the initial mapping run was quick and accurate. You get four cleaning modes, spot cleaning, zone and room selection, scheduling, and the usual voice assistant support across Alexa, Siri and Google.

Where it fell down for me was in the manual controls. I wanted to trigger an auto-empty and a pad wash on demand, partly to time them and partly because I'd just run the machine through BBQ sauce, and I couldn't find an obvious way to do either. They may well be in there, but after twenty minutes of looking, I'd given up, and a feature you can't find is basically a feature you don't have.

Performance

​As per how we test robot vacuums at Ideal Home, I also put the Roomba Plus 415 Combo through some messy tests.

The BBQ sauce test was a roaring success, and I don't say that lightly, given how many robot mops fail it. A fresh, sticky spill on laminate, and the 415 took it up in a single pass, scrubbed rather than smeared, with nothing travelling onto the cream rug sitting alongside. It just dealt with it, then paused a few moments later to wash its pads.​

Edge cleaning is the other genuine strength. The pads and the sweeping brush get right up against the skirting, and the back corner of my lounge by the cat flap, which is permanently filthy in a way no upright vacuum solves, came up lovely and clean.​

Hair pickup was also strong. In the interests of full disclosure, this was my hair rather than the cat's - Jet having made himself unavailable for brushing at the critical moment - but three good tufts of it went up in one pass with no hesitation.

Carpet detection works, and, more usefully, you can hear it working. There's a reassuring uptick in fan noise as it crosses onto a rug, and the pads lift out of the way, so nothing came up damp the next morning.​

Unfortunately, object avoidance is the worst I've tested this year. It’s not cautious or oversensitive like many robots, but simply absent.

Cat toys were dragged from the lounge into the hallway rather than avoided; the robot got tangled in charging cables almost immediately and, at one point, made a determined attempt to climb Jet's puzzle feeder. It also ate my feet, twice, while I was sitting still.

This is the LiDAR-only tier, and iRobot's own product page claims obstacle recognition that steers around cords, shoes, and toys. On the evidence of a full day, I'd treat that claim with a healthy dose of scepticism. The mapping is genuinely good, and the coverage is systematic, but the machine has no idea what any individual object is and behaves accordingly.

It's also deliberately, methodically slow, which I don't mind at all in a machine that runs while I'm out, but it is a problem when you have to babysit.

Cleaning and maintenance

Following the BBQ sauce test, while I was feeling positive about its performance, I opened the robot afterwards to check the brush and found not only remnants of sauce inside but also every strand of hair from the earlier test tightly wrapped around the roller.

On a machine sold on tangle-free rubber brushes, that's a real mark against it, and the sort of thing that turns into a five-minute job with scissors every couple of weeks (or more if you lose hair as I do).

The dock handles the rest well enough. It auto-empties into the AllergenLock bag, pad-washes between runs, and then dries with warm air at 45 °C. That's cooler than the 75°C wash some rivals manage, and whether it's enough to stop pads going sour is a question I can only answer with more time.

​The tanks lift out easily and refill without fuss, and the filters need to be changed every three to six months. Bags and pads are an ongoing cost, and I'd expect it to fall in a similar range to other models in this class.

How does it compare to similar models?

The MOVA P50 Pro Ultra, which I tested in the same flat, has better plumbing and a genuinely anti-tangle brush, but its dock is nearly twice the footprint, and it split the sauce test that the 415 passed outright.

​The Eufy Omni E25 holds a five-star rating from Ideal Home and delivers stronger raw suction, so a mostly carpeted home is better served by it.

​Within iRobot's own range, the step up to the Roomba Plus 575 adds AI visual recognition alongside LiDAR, which is exactly what the 415 is missing. If your floors have cables, pet toys or anything else it might eat, I'd work out what that gap costs before saving money at this tier.

Verdict: Should you buy the Roomba Plus 415 Combo?

If your home is mostly hard flooring and you're reasonably disciplined about clearing the floor, yes, and fairly happily. The mopping is one of the best I've seen at this price; the edges get proper attention, and the dock is small enough that finding it a home isn't a project in itself.

But the object avoidance is a problem, and it isn't a small one. A robot vacuum earns its money by being something you don't have to think about, and this is a machine you have to tidy up for. Every cable, every toy, every pair of shoes left by the door becomes something you deal with before you press start. Whether that's a fair trade depends on how much clearing you were going to do anyway.