The Eufy Omni E35 and Omni S2 both combine self-cleaning roller mops with automated docks. E35 has the lower price in SRR’s latest verified US offers; S2 adds documented carpet-clearance hardware, electrolyzed water and dirt-responsive mop washing. The useful decision is whether those extras solve a problem in your home—not which model advertises the higher suction number.
Quick Verdict
Summary
Choose E35 for lower-cost roller mopping and automated mop care. Consider S2 for its specific clearance and water-treatment features, rather than assuming a universal cleaning upgrade.
Winner
E35 for lower upfront cost; S2 when its additional systems fit your home.
Caveat
Based on manufacturer specifications and attributed third-party reviews. No controlled E35-versus-S2 test or SRR hands-on test is claimed.
Value
E35 has the lower price in verified US offers checked October 19, 2026. Check both offers for the current difference.
In short
Choose E35 if you want HydroJet roller mopping and automated mop care at the lower verified upfront price, without paying for S2’s extra systems. Choose S2 if its documented chassis and mop clearance, dirt-responsive washing or electrolyzed-water system solve a specific need in your home. Published S2 tests are useful supporting evidence, but do not establish that it beats E35 at hair pickup or obstacle avoidance. For dried-on stains alone, an S2 upgrade is not justified by the evidence available. Compare current offers and your rug clearances before choosing.
At a glance
A side-by-side look at the differences that matter most.
| Feature | Eufy Omni E35 | Eufy Omni S2 |
|---|---|---|
| US price | Check current offer | Check current offer |
| US availability | In stock at October 19 verification | In stock at October 19 verification |
| Model number | T210M | T2081111 |
| Claimed peak suction | 35,000 Pa | 30,000 Pa |
| Mop | HydroJet 2.0 self-cleaning roller | HydroJet 2.0 self-cleaning roller; electrolyzed water |
| Obstacle avoidance | AI See 3.0 | 3D MatrixEye 2.0 / CleanMind |
| Brushes | DuoSpiral | DuoSpiral |
| Dock | ThermoFresh: hot mop wash/dry, auto empty/refill, wastewater draining | UniClean: hot mop wash/dry, detergent dispensing, wastewater collection, electrolyzed water |
| Quantified pet-hair test | Comparable result not found | 88.5% in Vacuum Wars flattened-hair test |
| Quantified obstacle test | Comparable score not found | 24/24 objects avoided in Vacuum Wars tests |
| Brush care | Weekly with pets/long hair; otherwise every 2–4 weeks | Complete schedule unresolved |
| S2 clearance specification (manufacturer claim) | Matched US specification not verified | 1.1-inch mop lift; 1.38-inch single / 1.65-inch double threshold claim |
Key differences
The practical differences between these models, explained in plain terms.
What changes between E35 and S2?
Eufy positions E35 below S2. Both have HydroJet 2.0 roller mopping, AeroTurbo 2.0 and DuoSpiral brushes.
- E35 uses AI See 3.0 and a ThermoFresh hot wash-and-dry dock; S2 uses 3D MatrixEye 2.0/CleanMind, documented chassis lifting and electrolyzed water.
- Those features do not prove better cleaning in every home.
- Sources: E35 US specifications, S2 US specifications, Eufy lineup guide (UK).
Carpet and hard-floor cleaning
TechRadar's E35 test found fine carpet residue at lower settings; Max power, Deep intensity and two passes cleared it. Hard-floor oats needed Turbo, Deep intensity and two passes.
- Its S2 review reports complete hard-floor crumb pickup at standard settings; stronger modes and repeated passes helped on carpet.
- These separate reviews used similar debris, but were not a controlled head-to-head.
- Their settings do not establish comparative efficiency.
Pet hair and long hair
Vacuum Wars measured S2 at 87% embedded-sand pickup, 88.5% flattened pet-hair pickup and no wrapping in its seven-inch hair test. Comparable E35 measurements were not found.
- Both use DuoSpiral brushes, but shared hardware branding does not establish equal results.
- S2 has stronger measured support for shedding households; this is not an SRR test or a direct victory over E35.
- For alternatives beyond these two Eufys, see robot vacuums for pet hair.
Obstacle avoidance
E35 uses AI See 3.0; S2 uses 3D MatrixEye 2.0 and CleanMind. Those are different sensing and software packages, but feature names alone cannot rank real-world avoidance.
- TechRadar reports that both avoided a shoe, sock and USB cable in its separate home tests.
- Vacuum Wars recorded S2 avoiding 24 out of 24 objects in its courses; no equivalent E35 score was found.
- That supports confidence in S2 in those tests, not a proven win over E35.
Roller mopping and carpet protection
Both have HydroJet 2.0 self-cleaning rollers. Eufy specifies electrolyzed water, chassis lifting and a 1.1-inch roller-mop lift for S2.
- These are manufacturer specifications, not SRR measurements.
- TechRadar reports S2 removed dried ketchup, while Vacuum Wars recorded 82 points in its dried-stain test, below its studio average.
- Different methods explain why those observations cannot be treated as equivalent tests.
Dock automation and manual care
Both robots automate core mop care. Eufy documents E35’s ThermoFresh dock with hot washing, drying, dust emptying, refilling and wastewater draining.
- S2’s UniClean dock adds a documented electrolyzed-water system and dirt-responsive mop washing, alongside hot washing, drying and detergent dispensing.
- S2 also includes a fragrance dispenser; treat that as an optional preference, not a cleaning-performance advantage.
- Check the complete dock package rather than counting the advertised number of functions.
Compromises and reliability
E35 needed stronger settings for fine carpet debris in TechRadar's test; matched quantified hair results remain unavailable. Vacuum Wars reported weaker S2 dried-stain results and only one successful crossing in three attempts at a 32 mm single threshold.
- TechRadar's first S2 developed a robot-to-dock connection fault after about a month and required replacement; the replacement worked during the remaining test.
- That incident is not a failure-rate estimate.
- Long-term comparative reliability remains unknown.
When is the S2 worth paying more for?
Pay more for S2 when its documented carpet-clearance hardware and published hair-pickup and obstacle-avoidance results address your home's main cleaning problems.
- E35 offers the core roller-mopping and automated dock package at the lower price in SRR's latest verified US offers, checked October 19, 2026.
- The gap can change, so compare both offers before buying.
- Check E35 current availability or check S2 current availability.
Related guides
For the broader range, see Eufy robot vacuums compared. For another S2 comparison, read Eufy Omni S2 vs S1 Pro.
- For alternatives across brands, see the robot vacuum buying shortlist.
Sources and comparison basis
Manufacturer specifications: Eufy E35 US, Eufy S2 US. Original hands-on reports: TechRadar E35, TechRadar S2, Vacuum Wars S2.
- Maintenance: Eufy support.
- Positioning: Eufy UK guide.
- These third-party results are not SRR testing.
What changes between E35 and S2?
Eufy positions E35 below S2. Both have HydroJet 2.0 roller mopping, AeroTurbo 2.0 and DuoSpiral brushes. E35 uses AI See 3.0 and a ThermoFresh hot wash-and-dry dock; S2 uses 3D MatrixEye 2.0/CleanMind, documented chassis lifting and electrolyzed water. Those features do not prove better cleaning in every home. Sources: E35 US specifications, S2 US specifications, Eufy lineup guide (UK).
E35 US specificationsS2 US specificationsEufy lineup guide (UK)
Carpet and hard-floor cleaning
TechRadar's E35 test found fine carpet residue at lower settings; Max power, Deep intensity and two passes cleared it. Hard-floor oats needed Turbo, Deep intensity and two passes. Its S2 review reports complete hard-floor crumb pickup at standard settings; stronger modes and repeated passes helped on carpet. These separate reviews used similar debris, but were not a controlled head-to-head. Their settings do not establish comparative efficiency. Higher advertised suction alone does not establish better pickup. If carpet pickup is your main concern, compare the wider shortlist in robot vacuums for carpet.
Pet hair and long hair
Vacuum Wars measured S2 at 87% embedded-sand pickup, 88.5% flattened pet-hair pickup and no wrapping in its seven-inch hair test. Comparable E35 measurements were not found. Both use DuoSpiral brushes, but shared hardware branding does not establish equal results. S2 has stronger measured support for shedding households; this is not an SRR test or a direct victory over E35. For alternatives beyond these two Eufys, see robot vacuums for pet hair.
Obstacle avoidance
E35 uses AI See 3.0; S2 uses 3D MatrixEye 2.0 and CleanMind. Those are different sensing and software packages, but feature names alone cannot rank real-world avoidance. TechRadar reports that both avoided a shoe, sock and USB cable in its separate home tests. Vacuum Wars recorded S2 avoiding 24 out of 24 objects in its courses; no equivalent E35 score was found. That supports confidence in S2 in those tests, not a proven win over E35. Keep small hazards and pet waste off the floor. Sources: E35 home test, S2 home test, S2 obstacle-course testing.
Roller mopping and carpet protection
Both have HydroJet 2.0 self-cleaning rollers. Eufy specifies electrolyzed water, chassis lifting and a 1.1-inch roller-mop lift for S2. These are manufacturer specifications, not SRR measurements. TechRadar reports S2 removed dried ketchup, while Vacuum Wars recorded 82 points in its dried-stain test, below its studio average. Different methods explain why those observations cannot be treated as equivalent tests. No matched E35 score establishes a mopping winner. Sources: Eufy, TechRadar, Vacuum Wars. Our roller-mop versus spinning-mop guide explains the hardware trade-off; the robot vacuum and mop buying guide covers alternatives.
EufyTechRadarVacuum Warsroller-mop versus spinning-mop guiderobot vacuum and mop buying guide
Dock automation and manual care
Both robots automate core mop care. Eufy documents E35’s ThermoFresh dock with hot washing, drying, dust emptying, refilling and wastewater draining. S2’s UniClean dock adds a documented electrolyzed-water system and dirt-responsive mop washing, alongside hot washing, drying and detergent dispensing. S2 also includes a fragrance dispenser; treat that as an optional preference, not a cleaning-performance advantage. Check the complete dock package rather than counting the advertised number of functions. E35 dock specifications; S2 dock specifications. Eufy’s E35 care guidance calls for brush cleaning weekly with pets or long hair, otherwise every two to four weeks. A complete comparable S2 schedule remains unverified. Empty dirty water and maintain brushes, filters and consumables according to the applicable manual; neither is maintenance-free. See what self-emptying and self-washing docks actually handle.
E35 dock specificationsS2 dock specificationsE35 care guidancewhat self-emptying and self-washing docks actually handle
Compromises and reliability
E35 needed stronger settings for fine carpet debris in TechRadar's test; matched quantified hair results remain unavailable. Vacuum Wars reported weaker S2 dried-stain results and only one successful crossing in three attempts at a 32 mm single threshold. TechRadar's first S2 developed a robot-to-dock connection fault after about a month and required replacement; the replacement worked during the remaining test. That incident is not a failure-rate estimate. Long-term comparative reliability remains unknown. Sources: E35 review, S2 testing, S2 home-use report.
When is the S2 worth paying more for?
Pay more for S2 when its documented carpet-clearance hardware and published hair-pickup and obstacle-avoidance results address your home's main cleaning problems. E35 offers the core roller-mopping and automated dock package at the lower price in SRR's latest verified US offers, checked October 19, 2026. The gap can change, so compare both offers before buying. Check E35 current availability or check S2 current availability. As an Amazon Associate, we earn from qualifying purchases.
Related guides
For the broader range, see Eufy robot vacuums compared. For another S2 comparison, read Eufy Omni S2 vs S1 Pro. For alternatives across brands, see the robot vacuum buying shortlist.
Eufy robot vacuums comparedEufy Omni S2 vs S1 Prothe robot vacuum buying shortlist
Sources and comparison basis
Manufacturer specifications: Eufy E35 US, Eufy S2 US. Original hands-on reports: TechRadar E35, TechRadar S2, Vacuum Wars S2. Maintenance: Eufy support. Positioning: Eufy UK guide. These third-party results are not SRR testing. Manufacturer claims are distinguished from observed performance. Prices and purchase destinations come from SRR's verified US commerce records.
Eufy E35 USEufy S2 USTechRadar E35TechRadar S2Vacuum Wars S2Eufy supportEufy UK guide
Which should you buy?
Choose Eufy Omni E35
- Choose E35 when hard-floor washing and automated mop care are your priorities and its lower current offer matters.
- Its higher advertised suction is not proof of better carpet pickup.
- Skip it if you require a verified clearance specification that has not been confirmed for your rugs or thresholds.
Choose Eufy Omni S2
- Choose S2 when its documented chassis/mop clearance or water-treatment and dock functions are useful in your home.
- Use its published hair and obstacle results as supporting evidence, not a direct win over E35.
- Skip the premium if you only want better dried-stain removal or expect maintenance-free ownership.
Final verdict
Choose E35 if you want HydroJet roller mopping and automated mop care at the lower verified upfront price, without paying for S2’s extra systems. Choose S2 if its documented chassis and mop clearance, dirt-responsive washing or electrolyzed-water system solve a specific need in your home. Published S2 tests are useful supporting evidence, but do not establish that it beats E35 at hair pickup or obstacle avoidance. For dried-on stains alone, an S2 upgrade is not justified by the evidence available. Compare current offers and your rug clearances before choosing.
Frequently asked questions
Does E35 replace S2?
No replacement relationship was found. Eufy's guide positions E35 below S2, with both sold alongside one another.
Which is better for pet hair?
S2 has stronger measured support from Vacuum Wars. Comparable E35 results are missing, so a direct winner is unproven.
Does S2 mop better?
Not established. Both have roller mops; separate reviewers obtained different S2 stain results using different methods.
Is either maintenance-free?
No. Eufy advises E35 brush cleaning weekly with pets or long hair, otherwise every two to four weeks. A complete equivalent S2 schedule remains unverified.
Is the S2 worth its price premium?
Its additional cost makes the most sense when carpet clearance and measured hair-pickup and obstacle-avoidance evidence match your priorities. Compare current offers; the price difference can change.