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Robot Autonomy, Classified
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Ownership burden/Robot Vacuums/2 robots compared/Reviewed Aug 2026

Roomba Max 775 Combo vs Eufy C28 Omni: real cost to own

$885 to $1,1003-year total. Purchase price is between 90% and 91% of what these machines actually cost to run.
iRobot Roomba Max 775 ComboView recordiRobotIIIMax 775 Combo3-year total$1,100
Eufy C28 OmniView recordEufyIIIC28 Omni3-year total$885
Full specifications18 measurements · 30 of 36 documented
MSRP
$999.99
$799.99
Rated runtime
Not documented
123 min
Charge time
Not documented
210 min
Battery type
Li-ion
Li-ion
Suction power
30,000 Pa
15,000 Pa
Noise level
Not documented
58 dB
Navigation
ClearView Pro LiDAR 3D mapping with PrecisionVision AI object recognition
Spinning LiDAR (LDS) + iPath 2.0 + line laser obstacle avoidance
Connectivity
wifi, alexa, google_home
wifi, bluetooth, matter, alexa, google_home
Dimensions (W×D×H)
14.4 × 14.7 × 4.1 in
13.8 × 12.9 × 4.35 in
Weight
12.79 lbs
11.02 lbs
Form factor
round
squared
Readiness
Promising Progress
Ready Now
Released
May 2026
Feb 2026
Dock type
Auto-empty, mop washing, hot-water washing, auto water refill
Auto-empty, mop washing, drying, auto water refill, detergent dosing
Threshold climb
0.6 in
0.8 in
Dust bag capacity
Not documented
3 L
Mop lift
Not documented
10.8 mm
Water tank capacity
Not documented
120 mL

Three-year cost of ownership

What each robot actually costs to own

Purchase price plus documented consumables, subscription gating, and replacement events. Bars share one dollar scale, so length is directly comparable. Costs are typical, drawn from manufacturer maintenance guides and owner reports.

PurchaseConsumablesSubscriptionRepairs

Eufy C28 Omni$800 purchase
$8853-year total+$85 past purchase
  • MSRP$800
  • Dust bags (3-yr)$85

iRobot Roomba Max 775 Combo$1,000 purchase
$1,1003-year total+$100 past purchase
  • MSRP$1,000
  • AutoWash dock bags (3-yr)$80
  • Replacement filters (3-yr)$20

Documented failure events

When things break, and what they cost

Field-reported failures placed on the ownership timeline, with associated repair or replacement costs. Sourced from owner forums and manufacturer service documentation.

Within 2 weeks · Eufy C28 OmniMajor

Wheel malfunction on early unit

$0 (under warranty)

Some early Eufy C28 Omni owners reported a right-wheel malfunction within days of first use, requiring a manufacturer-replaced unit. Reports describe the issue as isolated to a subset of early units, not a systemic defect.

Owner reports, robot vacuum review coverage, 2026
Week 2 · Roomba Max AutoWash dockMajor

AutoWash dock heating and odor complaints

$0 (under warranty)

Owner reports aggregated on Reddit describe AutoWash docks that failed to heat water within the first two weeks, producing a persistent musty smell despite repeated cleaning of the brush roll and water tanks; some owners required a replacement unit.

Owner reports aggregated via Reddit, 2026
Month 2 · Eufy C28 OmniMinor

Mapping and room-skipping glitches

$0 (firmware-side, no part cost)

Owner reviews describe the Eufy C28 Omni occasionally skipping rooms or re-scanning already-mapped areas. Reviewers characterize the behavior as intermittent rather than persistent, and it carries no documented consumable or repair cost.

Vacuum review sites, owner-reported, 2026
Months 4-6 · Roomba Max AutoWash dockMinor

Hard-water mineral buildup in dock lines

$0 (owner labor, no part required)

iRobot's own care guide flags mineral buildup in the AutoWash dock's water lines as a hard-water risk needing manual descaling beyond the standard 3-to-6-month check, an unscheduled task for owners outside soft-water areas.

iRobot Roomba Max 700-series care guide, 2026

Consumables breakdown

Annual cost by part type

Each line is the manufacturer-recommended replacement frequency multiplied by the current part cost. No assumptions about deep-cleaning intervals.

Part · frequencyMax 775 ComboEufy C28 Omni
Dock bagsEvery ~75-90 days$27 / yr$28 / yr
Robot filterAnnually$7 / yrNot documented
Detergent / solutionAs neededNot applicableNot documented
Water-line descale / flushEvery 3-6 months (hard water)$0 (labor only)$0 (labor only)
Annual total$34 / yr documented$28 / yr documented

Common questions

What readers ask about this comparison.

Q.
How much do dock consumables cost per year for each robot?
Manufacturer part listings price the Roomba Max 775 Combo’s AutoWash dock bags at roughly $27 a year and its dustbin filter at about $7 a year. The Eufy C28 Omni’s dust bags run close to $28 a year; its washable filter and detergent cartridge carry no published replacement price.
Q.
Which robot asks more of the owner day to day?
The Eufy C28 Omni’s maintenance guide lists an after-every-use dock check plus weekly water-level and roller inspections. The Roomba Max 775 Combo’s guide starts at weekly tasks with no per-cleaning check, a lighter routine cadence even though both machines run a Level III conditional-autonomy program.
Q.
Do either of these robots require a paid subscription?
Neither manufacturer’s product documentation lists a mandatory paid subscription for scheduling, mapping, or dock automation on these models.
Q.
Are there documented reliability issues owners should budget for?
Owner reports describe early AutoWash dock heating and odor problems on the Roomba Max 700 series, and early wheel and mapping issues on the Eufy C28 Omni. Both were resolved under warranty in the cited reports, with no owner-documented out-of-pocket repair cost at this product’s current age.
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Comparison ID: RV–CMP–8695 · Last reviewed Aug 12, 2026 · Based on owner reports, manufacturer documentation, and firmware release notes