A practical comparison

eufy Omni S2, C28 or E35: compare carpet, thresholds and dock routines

eufy's Omni S2, C28, and E35 each combine a robot vacuum with a roller mop and a station that services water and dust. The useful comparison is not a single “best” suction number. The S2 T2081111 has a defined carpet claim and separate single- and double-layer threshold figures; the C28 has a more modest 2 cm threshold statement plus a specific rug warning; the E35 lists the largest suction maximum of the three but leaves exact threshold and pile limits open in the sources reviewed.

Match the route and surfaces first

The S2 page lists up to 3.5 cm on a single-layer threshold and up to 4.2 cm under a double-layer condition. Those should not be collapsed into one unrestricted crossing height. The exact transition shape and gap matter, so the double-layer figure is not a promise for a single abrupt step. The C28's official support answer says it is designed for up to 2 cm, with a caution that slick sills can still defeat it. The E35's exact guide gives 30 mm obstacle clearance, but no maximum threshold claim; that obstacle figure is not a threshold rating.

Carpet evidence differs just as much. eufy lists the S2 for carpet up to 2 inches and says the mop lifts; the FAQ advises vacuum-only mode for short or medium pile, avoidance for thick carpets over 5 cm, and caution around tassels and dark rugs. The C28's guide warns owners to avoid high-pile rugs or carpets thicker than 18 mm. The exact E35 sources reviewed here state 26 mm carpet clearance but no supported pile-height range. A clearance measurement is not carpet approval, and an unknown pile limit should not pass a requirement you consider essential.

Compare the rollers and advertised suction honestly

All three are roller-mop configurations, but the S2's HydroJet 2.0 page lists 15 N pressure and 240 rpm, the E35 manual lists a 290 mm roller with up to 16 N downforce and 32 mm extension, and the C28 is also described as a HydroJet self-cleaning roller. The S2 lists 30,000 Pa, the E35 35,000 Pa, and C28 15,000 Pa. These are manufacturer-listed maxima, not comparable pickup results. A 30,000 Pa minimum would keep the S2 and E35 in consideration and exclude the C28 on the published figures; it does not establish that the E35 cleans better in a room.

The S2 additionally advertises 3D MatrixEye 2.0 recognition for more than 200 object types. That is a stated recognition capability, not an assurance against every floor obstacle. The exact C28/E35 review records do not establish the same numeric recognition count, so only the S2 should meet a 200-type essential filter in this set. If clutter avoidance is central, also consider whether you can remove cords, secure loose rugs, and use app no-go zones rather than treating a recognition number as a substitute for room preparation.

Stations: tanks, plumbing, and temperature are separate choices

The reviewed base packages use removable water tanks, not a fixed supply and drain. The S2 T2081111 guide lists 3 L clean water, 2 L dirty water, and a 2.5 L dust bag; the C28 lists 2.2 L for each station water tank and a 3 L bag; the E35 lists 2.5 L clean water, 2.4 L dirty water, and a 2.5 L bag. Capacities are not a set number of weeks: floor area, dirt, and frequency change service intervals. The exact S2 T2081111 + T210L110 package is a separate fixed-supply-and-drain option, not the standard tank station: eufy's 11-page system guide limits the inlet and drain routes to 6 m, limits drain rise to 1 m (0.5 m recommended), and specifies a 1.5 cm minimum outlet. Read the T210L110 configuration review before deciding if the installation is realistic; do not apply its plumbing plan to the standard T2081111 configuration.

Temperature claims need the same separation. The S2 page advertises electrolyzed water, but the guide does not state a numeric mop-cycle water temperature. E35's guide says the station washes and dries at 55°C without identifying a water measurement point. Neither statement establishes a temperature delivered to the floor. C28 documentation describes warm-air drying without a numeric temperature. If you need warm water on the floor or a particular dock-wash temperature, select only a configuration whose own materials state the relevant temperature and what it measures.

Let your answers do the choosing

For a 2.4 GHz network and a real-time roller, each can remain eligible, but a 5 GHz-only home is not confirmed for these exact eufy plans. A strict single-layer 4 cm transition does not match the S2's 3.5 cm general claim even though its qualified double-layer number is larger; the C28's published maximum is 2 cm and the E35 maximum is unknown. If supported carpet pile is essential, the S2's stated 2-inch limit is the only explicit positive limit among these three reviewed source sets; that remains a maker claim with avoidance conditions, not a test result. If the highest listed suction number is the deciding threshold, the E35 is the one to investigate, while its route and rug answers remain unknown.

All three still need hands-on care. The S2 guide gives operating-hour intervals for a dirty-water reservoir, filter tray, roller and brushes; C28 and E35 documentation also directs owners to service tanks and consumables. Check where the station can sit, how its tanks are reached, which app setup/network is available, and whether a robot may cross every rug and sill on its route. The best fit is the exact package whose documented limits match those answers—not the one with the most features in a headline.

Read the eufy Omni S2 T2081111 standard-tank assessment · Compare its T210L110 fixed-plumbing package · Read the Omni C28 assessment · Read the Omni E35 assessment