Dreame L40 Ultra vs Roborock Saros 20
3 questions both answer, side by side. Every answer is backed by the dated sources at the bottom.
Side by side
Can a robot vacuum get over high door thresholds?
Dreame says the L40 Ultra crosses obstacles up to 0.86 inches (22 mm).
Good to know: Figure from Dreame's lab.
The Saros 20 lifts its body to climb a single threshold of 57 mm in Vacuum Wars' test, and two-step sills up to 8.8 cm per Roborock.
Good to know: The 8.8 cm figure only applies to two steps (4.5 + 4.3 cm). Around €1,499 in Europe.
Can a robot vacuum keep its wet mop off the carpet?
Dreame lists a 10.5 mm mop lift for the L40 Ultra, and says it lifts or removes the mops to keep carpets dry.
Good to know: Listed spec.
The Saros 20 lifts its two mop pads 20 mm on carpet and can drop them at the dock before vacuuming.
Good to know: Listed spec, not measured.
Can a robot vacuum pick up pet hair without tangling?
Consumer Reports lists the Dreame L40 Ultra among its top picks for picking up embedded pet hair.
Good to know: Consumer Reports' lab test (March 2026). Dreame's anti-tangle TriCut brush is sold separately.
The Saros 20 scored 88 on the pet hair pickup test with zero tangles.
Good to know: Lab test on one unit.
Only checked for one of them
Can a robot vacuum deep-clean carpet?
The Saros 20 scored 89 in the carpet deep-clean test.
Good to know: Lab test on one unit.
How we know (5 sources)
Lab test of robot vacuums on pet hair (1 g of cat fur embedded in carpet). Some robots drag hair around or tangle it in the brush; the best pick up almost all of it. Top picks: Dreame L40 Ultra, Dyson 360 Vis Nav, Eufy C10, Eureka NERE10SW, iRobot Roomba Max 705, Samsung Jet Bot. Many vacuum-mop combos struggled with dried stains. Notes iRobot filed for bankruptcy the previous December and said app and support would continue.
Read the sourceUS Dreame L40 Ultra page (read Oct 24, 2026): $799.99. Mop lifting height 10.5 mm (0.4 in), and it lifts or removes the mops to keep carpets dry; crosses obstacles up to 0.86 in (22 mm), per Dreame's lab. 11,000 Pa suction; works with Alexa, Siri and Google Home. An anti-tangle TriCut brush is sold separately.
Read the sourceReview of the Roborock Saros 20 (MSRP €1,499): its AdaptiLift Chassis 3.0 climbs steps up to 8.8 cm, but only as two steps of 4.5 and 4.3 cm, more than double the Saros 10R's 4 cm. Reliable obstacle detection, under 8 cm tall, average battery life.
Read the sourceReview of the Saros 20 Sonic (last updated Aug 28, 2026): it cleared a 57 mm single threshold, above Roborock's 45 mm rating and tied with the standard Saros 20 for the best result Vacuum Wars has recorded. Strong vacuuming; mopping below expectations for the price.
Read the sourceTest and spec page for the Roborock Saros 20, read Oct 22, 2026. Lab results: carpet deep clean 89, flattened pet hair pickup 88, zero wraps in the 7-inch hair tangle test. Specs: two spinning mop pads that lift 20 mm on carpet and can be left at the dock; 88 mm threshold climbing.
Read the source