eufy E15 review: a wire-free robot mower for a small, shady yard

Which yards is the E15 for?

The E15 is built for a small lawn. eufy rates it for up to about a fifth of an acre. That is about the size of a normal suburban front and back yard. It works best on flat or gently sloping grass. A tree or two overhead does not stop it. It is the wrong mower for a large lawn, a steep slope, or thick grasses like St. Augustine.

0.2acre810m²

The most lawn it will map and mow

8in20cm

How wide a strip it cuts on each pass

56dB

How loud it runs, quieter than a push mower

If you are weighing a few small-yard robots side by side, see our pick of the best mowers for a small yard.

How does it find the lawn without a wire?

Older robot mowers follow a wire you bury around the lawn’s edge. Newer mowers use satellite signals, and they need open sky to receive those signals. The E15 uses neither a buried wire nor satellite signals. It has a camera on the front, and it steers from the camera image. eufy calls this vision navigation. You walk the mower around your lawn once, holding your phone, and it learns the shape.

The camera looks down at the grass, so tree cover overhead does not stop the mower. A satellite mower loses its signal under heavy branches and stops. The E15 keeps going in light shade. Our guide to satellite mowers explains how they work and why trees block their signal.

The camera only works in daylight, so the E15 mows by day. It also needs a visible edge between the grass and the next surface, like a path or a bed. If that edge is unclear, mark the edge of the lawn in the app.

What grass and slope does it suit?

Two things decide whether the E15 will work on your lawn: how steep it is, and what grass grows there.

Start with slope. eufy rates the E15 up to a rise of 40 ft40 m for every 100 ft100 m forward. It drives only two wheels, so use it on slopes well under a rise of 40 ft40 m per 100 ft100 m. Wet grass is slippery, so expect it to handle less slope after rain. Use it only on gentle slopes. For anything steeper, set a no-go zone. That means a patch you tell the app to leave alone.

Now the grass. eufy names two kinds it does not recommend: St. Augustine and Zoysia. Both spread by thick runners that creep across the soil. A Clemson extension factsheet on St. Augustinegrass describes those runners and the dense mat they build. A small mowing robot can struggle to cut a lawn like that cleanly. If you have St. Augustine or Zoysia grass, do not buy the E15.

What are the drawbacks?

The E15 connects to your phone over Bluetooth and home Wi-Fi. It has no cell signal of its own. So you can only start it or check it from home.

The E15 has some theft protection. It has a PIN, and it sends an alert to your phone if someone lifts it off the lawn. But with no signal of its own, it cannot tell you where it went. If your lawn is behind a fence, theft is unlikely. On an open front lawn by the road, a thief could carry it away.

It also senses rain and heads back to its charging station on its own. Wet grass clumps and clogs a mower, so leave the rain setting on.

Should you buy the E15?

For a small, fairly flat lawn with a tree or two, the E15 is one of the easiest robots to own. There is no wire to bury, and it does not need open sky. You walk it around the lawn once, and then it mows on its own.

It does have limits. It mows a fifth of an acre at most. It needs flat ground and a grass other than St. Augustine or Zoysia. Do not buy the E15 if your lawn is bigger than a fifth of an acre, is steep, or grows St. Augustine or Zoysia grass.

So walk your lawn before you buy. Measure the lawn, check the slope, and find out which grass you have. If your lawn is under a fifth of an acre, gently sloped, and not St. Augustine or Zoysia, the E15 should work well.