How loud is a robot lawn mower?
Between 55 dB and 65 on the makers' pages, though only ECOVACS tells you what its figure is.
Its GOAT O1000 is listed at 57 dB(A) in the spec table, and the manual gives that as sound power, alongside a sound pressure figure of 49 dB(A). The same 8 dB gap shows up across the range: 60 and 52, then 62 and 54. Sunseeker's 55dB, eufy's 56dB, Worx's 59 dB and Dreame's 62.8dB are all bare numbers, with nothing to say which kind they are.
Husqvarna labels its row "Sound level perceived" and never defines the phrase on its product pages. Its Automower manuals do. Our Husqvarna decibels page quotes them measuring that level according to ISO 11094:1991, and lists the 420 iQ at 56 dB(A) perceived.
Sorting those numbers gives a ranking you cannot trust. For the same machine, a sound pressure figure will always come out lower than a sound power one, so the brand quoting pressure looks quieter without being quieter. We put the ECOVACS models first because their figures can be interpreted, and we say plainly what everyone else leaves out.
Why Sunseeker's bare 55dB cannot be set against ECOVACS' 57 dB(A) of sound power is the subject of our page on comparing decibel ratings.
Walk-behind mowers carry both kinds of figure too, declared mostly in European manuals, and our guide to push and self-propelled mowers keeps the operator figure and the guaranteed sound power apart for the same reason.
Segway is the one maker to footnote its conditions: "Measured under laboratory no-load conditions", meaning the mower was not cutting grass. A fair footnote. It also tells you the real figure on a lawn is higher.
Do robot mowers need a boundary wire?
Most of our picks do not. ECOVACS, Segway, eufy, Sunseeker and Dreame all sell models that work without one, using RTK satellite positioning, cameras, LiDAR or a mix, while Husqvarna's 435X AWD and the Worx Landroid L still run inside a wire. How a mower finds its way decides how much work you do before it ever cuts.
| Navigation | Setup | Examples here |
|---|
| Boundary wire | Peg or bury a wire around the lawn | Husqvarna 435X AWD, Worx Landroid L |
| RTK with an antenna | A satellite antenna on a pole gives centimetre accuracy, and needs open sky | ECOVACS A2500, whose antenna stands nearly four feet tall |
| Camera or LiDAR, no antenna | The mower reads its surroundings | eufy E15 (cameras alone), Segway H210 (LiDAR, RTK and vision), ECOVACS A3000 (dual LiDAR) |
Wire-free setups are easier, but they depend on what they can see. A garden under heavy tree cover suits LiDAR or a wire better than plain RTK.
Most makers publish one slope figure for the lawn and a lower one for its edge, and buyers often read only the first.
Inside the lawn, Dreame claims 80%, Segway's X330 50%, ECOVACS 45 to 50% and eufy 18 degrees. At the edge the numbers fall. Segway allows 25% at the boundary against 50% inside, and ECOVACS allows 17% at a virtual boundary against 45% inside.
If your lawn falls away at the edges, the boundary figure decides whether the mower can work there at all.
Can a robot mower run at night?
ECOVACS' GOAT mowers will not, by default. The manual says they stop mowing at night to protect nocturnal animals, and you can turn that off in the app. It is the only maker-imposed restriction we found in this set.
Your town may impose its own. Quiet hours ordinances commonly cover powered garden equipment, and a mower running at 6 a.m. is exactly the sort of thing they exist for. Check before you set a schedule.
A flat base and sharp blades keep it quieter
Start with the base station. ECOVACS asks for open, flat lawn with no slope or rock and nothing obstructing it, and a base on uneven ground makes docking noisier and less reliable.
Keep the blades sharp. Blunt ones make the motor work harder. Blades are the main consumable on every model here.
Then plan routes around the narrowest passage figure, which ECOVACS publishes as 2.3 ft for the O1000 and 2.62 ft for the A2500. A mower squeezing through a gap tighter than that will bump and reverse repeatedly, slower and louder at once.
Five mistakes robot mower buyers make
- Sorting the decibel figures and buying the lowest, when only ECOVACS tells you what its number means.
- Ignoring the boundary slope figure, which is often half the in-lawn one.
- Assuming wire-free means no setup, when RTK needs open sky and cameras need clear boundaries.
- Forgetting the subscription, since Segway's Connect+ renews at $32.90 a year after the free period.
- Buying for the lawn you have today, though coverage figures are rated areas that makers state with tolerances.
