SwitchBot S20 review: The First Robot Vacuum That Truly Does Its Own Chores

When SwitchBot launched the S10 last year, it felt like a fever dream of home automation. Here was a company best known for little plastic fingers that push buttons, suddenly promising a robot vacuum that plumbed itself into your house’s water lines. It was weird, it was ambitious, and against all odds, it actually worked. Now, we have the SwitchBot S20, a successor that takes that same “plumb it and forget it” philosophy and gives it the muscle it was missing.

If you are tired of carrying dirty water tanks to your sink every three days, this is the robot you buy. It is not the smartest vacuum on the market, nor is it the absolute best scrubber. But it is the only one that effectively disappears from your life for months at a time, and in the world of robot vacuums, invisibility is the ultimate luxury.

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Design

The S20 looks almost exactly like its predecessor, which is to say it looks like a robot vacuum. It is a circular puck with a LiDAR turret on top, clad in a matte white plastic that does a decent job of hiding dust. But the robot itself is only half the story. The real engineering magic – and the reason you are buying this – is the two-station setup.

Most flagship robots in 2025 come with a massive, monolithic dock that holds dust, clean water, dirty water, and maybe even detergent. They are enormous, ugly, and eventually start to smell like a wet dog if you don’t clean them. SwitchBot splits this into two. The main station is a compact auto-empty dock that charges the robot and sucks out the dust. It is small enough to hide under a side table.

The second station is the “Water Station,” and it is still the coolest piece of hardware in the category. It is a low-profile unit that connects directly to your home’s plumbing – usually under a kitchen or bathroom sink, or behind a washing machine. The genius part is that it doesn’t plug into a wall outlet. It runs on batteries and communicates with the robot via Bluetooth. The robot drives over, fills its internal tank with fresh water, dumps its dirty water into your drain, and then drives back to the cleaning area. You never touch water. You never smell dirty water. It just happens.

Positioning

SwitchBot is pitching the S20 not as a cleaning gadget, but as a home appliance. The distinction matters. A gadget is something you fiddle with; an appliance is something you install and ignore. By plumbing the S20 into your water lines, SwitchBot is trying to elevate the humble robovac to the status of a dishwasher or washing machine.

It is a bold positioning that largely pays off, provided you have the right home layout. If you rent an apartment where you can’t touch the plumbing, or if your only water access is up a flight of stairs the robot can’t climb, this product is useless to you. But for homeowners who can spare a connection under a sink, the S20 offers a level of autonomy that even the $1,500 flagships from Roborock and Dreame can’t match. Those robots still need you to refill their tanks eventually. The S20 has an infinite supply.

Performance

The biggest knock against the original S10 was that it was a brilliant mop but a mediocre vacuum. The S20 addresses this with a significant bump in raw power. Suction has jumped from 6,500 Pa to 10,000 Pa. In practice, this means the S20 is much better at pulling heavy debris like cat litter and coffee grounds out of medium-pile carpet. It’s still not quite on the level of the top-tier Dyson vacuums, but it’s no longer the weak link in the chain.

The mopping system remains the star. Unlike competitors that drag a wet pad across the floor or spin two damp discs, the S20 uses a “RinseSync” roller mop. It’s essentially a miniature steamroller that constantly spins, scrapes itself clean, and wets itself with fresh water in real-time. This means it is never wiping your kitchen floor with the soy sauce it just cleaned up in the dining room. The roller spins at 300 revolutions per minute, and because the robot can refill its water tank indefinitely, it is generous with water usage. Your floors get genuinely washed, not just dampened.

Navigation is handled by dToF LiDAR and an AI camera for obstacle avoidance. It is good, but not class-leading. The S20 maps rooms quickly and generally avoids shoes and cables, but it can still get confused by mirror-finish furniture legs or particularly complex chair arrangements. It’s a cautious driver, often slowing down to assess a situation.

App

The SwitchBot app has always been a bit of a utilitarian affair – lots of toggles, not much polish. That remains true here. The map editor is functional but clunky, and setting up “no-go” zones feels less precise than it should be. However, the S20’s saving grace is its support for Matter 1.4.

This is one of the first robots to fully leverage the new Matter standards for robot vacuums, which means you can bypass the SwitchBot app entirely for day-to-day use. You can add the S20 directly to Apple Home, Google Home, or Samsung SmartThings with full control over cleaning modes. Asking Siri to “clean the kitchen” actually works now, and you don’t need to build complex shortcuts to make it happen. For Apple HomeKit users specifically, the S20 is arguably the best robot vacuum available simply because it plays so nicely with the ecosystem.

One quirk remains: you still have to use the SwitchBot app to configure the initial plumbing setup and the “Water Station” location. The robot needs to “find” the water station relative to its charging dock, a process that involves driving it around like a remote-controlled car until it locks onto the signal. It’s a five-minute annoyance you only have to deal with once.

Comparison with Others

If you compare the S20 to the Roborock S8 MaxV Ultra, the Roborock is a better robot. It navigates smarter, vacuums deeper, and its app is lightyears ahead. But the Roborock requires a massive dock that dominates your room and demands your attention every few days for water refills. The S20 is weaker on pure specs but superior on lifestyle integration.

Compared to the Dreame X40 Ultra, the S20 feels a bit more plasticky and utilitarian. The Dreame has extending mop arms to reach into corners, and it feels like a more premium piece of hardware. However, the Dreame suffers from the same “dirty water tank smell” problem that plagues all traditional docks. The S20’s direct-drain system completely eliminates odor because waste water is immediately flushed away. The Dreame Aqua10 Ultra Roller offers stronger suction (30,000 Pa vs. 10,000 Pa) and advanced AI-powered obstacle avoidance with dual cameras and 3D sensors, plus an all-in-one dock that refills and cleans its roller mop but requires manual water tank management and more floor space.

Against its own predecessor, the SwitchBot S10, the S20 is a worthy upgrade solely for the suction power. The S10 struggled with carpets; the S20 handles them with competence. If you have the S10 and mostly hard floors, you don’t need to upgrade. If you have rugs, the S20 is what the S10 should have been.

Verdict

The SwitchBot S20 is a triumph of infrastructure over artificial intelligence. It doesn’t try to outsmart your messy house with a supercomputer brain; it just outlasts the mess by having an infinite water supply. It is the most “set it and forget it” cleaning robot ever made.

It is not perfect. The app is still rough around the edges, and the obstacle avoidance is merely adequate rather than excellent. But these flaws are easy to forgive when you realize you haven’t touched the robot in three months. For most people, the friction of owning a robot vacuum isn’t the vacuuming – it’s the maintenance. By solving the maintenance problem with plumbing, SwitchBot has built the most livable robot vacuum of 2025.

Design 7
Price 8
Suction 8
Autonomy 10
App 7
Connectivity 10