Dreame L40 Ultra vs Eufy Omni S2 Pro
3 questions both answer, side by side. Every answer is backed by the dated sources at the bottom.
Side by side: where the details differ
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.
Eufy says the Omni S2 Pro crosses two-tier thresholds up to 2.76 inches (about 70 mm) and single-tier thresholds up to 1.38 inches (about 35 mm).
Good to know: Maker's spec, not tested. $1,699.99; Eufy's page said on Nov 3, 2026 that new orders ship around Nov 5.
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.
Eufy says the Omni S2 Pro lifts its roller mop 0.59 inches (about 15 mm) when it detects carpet, then vacuums without mopping.
Good to know: Maker's spec. Less lift than the 28 mm listed for the Omni S2, and the roller stays on the robot.
Does a robot vacuum wash its mop with hot water?
Dreame says the L40 Ultra's base station cleans the mop and washboard with water of up to 149°F (65°C), then dries the mops with hot air.
Good to know: Dreame Lab figure at about 73°F room temperature.
Eufy says the Omni S2 Pro's dock washes the roller mop with water up to 212°F (100°C), up from 140°F (60°C) on the Omni S2, and the robot can also mop with 131°F (55°C) hot water.
Good to know: Maker's figures; Eufy's page gives no drying temperature. Ships from around Nov 5, 2026.
Only checked for one of them
Can a robot vacuum clean in the dark?
Vacuum Wars describes an LED light on the front of the L40 Ultra that lets its camera see in dark places; it tied for second in their obstacle-avoidance course.
Good to know: The LED is a feature description; the review doesn't describe a run in a dark room.
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.
How we know (4 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 sourceVacuum Wars' Dreame L40 Ultra review (page says last updated Sep 16, 2026; read Oct 27, 2026): describes an LED light on the front that lets the camera see in dark places. In its obstacle-avoidance course the L40 scored 21, tying for second overall, against an average of 17. The review doesn't describe a test in a dark room.
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. Re-read Oct 25, 2026: the base station cleans the mop and washboard with hot water of up to 149°F (65°C), per Dreame Lab at about 73°F room temperature, and dries the mops with hot air.
Read the sourceUS product page for the eufy Robot Vacuum Omni S2 Pro, read Nov 3, 2026: $1,699.99 with Add to Cart, and a note that new orders are expected to ship around November 5. Its comparison with the Omni S2 lists: peak suction up from 30,000 to 40,000 Pa; dock mop washing with water up to 100°C instead of 60°C; added 55°C hot-water mopping and UV-C floor disinfection; obstacle recognition for 360+ object types instead of 200+, processed on the robot; two-tier thresholds up to 2.76 in instead of 1.65 in, single-tier up to 1.38 in; it climbs onto carpets up to 1.38 in thick, less than the Omni S2's 1.97 in. The roller mop lifts 0.59 in when carpet is detected. No battery runtime is given.
Read the source