Auto-empty, mop washing, drying, auto water refill, detergent dosing
Dust bag capacity
3 L
3 L
Onboard dustbin
Not documented
300 mL
Water tank capacity
Not documented
120 mL
Five-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.
PurchaseConsumables
Eureka J15 Max Ultra$1,200 purchase
$2,0255-year total+$825 past purchase
MSRP$1,200
Consumables (5 yr)$825
eufy Omni E28$1,400 purchase
$2,3255-year total+$925 past purchase
MSRP$1,400
Parts (5 yr)$700
Detergent (5 yr)$225
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.
Month 1 · Eureka J15 Max UltraMinor
SweepExtend snags on lamp wires and high-pile carpet
$0 (owner freed unit by hand)
Tom's Guide reported the robot got hung up on lamp wires and carpet corners during testing, and got stuck 'almost always' on high-pile carpet; the owner freed it by hand each time.
Tom's Guide review · 2026
Month 3 · eufy Omni E28 (early units)Minor
Dirty water tank leak on early production units
$0 (fixed by an update)
An owner on r/RobotVacuums described a dirty-water leak from the station's tank on early Omni E28 units, later remedied by an update; the same thread noted no long-term reports exist yet beyond that fix.
r/RobotVacuums owner report · 2026
Month 6 · eufy Omni E28Minor
Robot avoids space where a moved rug used to be
$0 (owner remap or manual correction)
Gizmodo moved three rugs during testing and found the E28 'didn't seem to register the difference,' continuing to avoid the vacated space until the map was manually corrected.
Gizmodo review · 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 · frequencyEureka J15 Max Ultraeufy Omni E28
Dust bagEvery 2-3 months$55 / yr$60 / yr
Mop pad / roller3-12 months, wear-based$40 / yr$35 / yr
FilterEvery 3-6 months$20 / yr$20 / yr
BrushesAnnual$50 / yr$25 / yr
DetergentEvery ~6 months$0 / yr (none used)$45 / yr
Annual total$165$185
Common questions
What readers ask about this comparison.
Q.
Does the Eureka J15 Max Ultra require a detergent subscription?
No. Eureka’s own product and support pages list no detergent cartridge for the J15 Max Ultra; the dock’s wash-and-dry cycle uses hot water only, so the recurring spend is replaceable parts rather than a chemical refill.
Q.
How often does the eufy Omni E28 need its detergent refilled?
eufy rates the automatic detergent supply at about six months per fill, dosed by the station rather than by hand. It is a proprietary consumable with no stated substitute.
Q.
Has either robot had documented failures?
An eufy Omni E28 owner on r/RobotVacuums reported a dirty-water tank leak on early units, later fixed by an update. No independent owner reports or press reviews document a comparable failure on the J15 Max Ultra; its own record cites only two Eureka web pages as sources.
Q.
Which robot has the higher 5-year ownership cost?
The eufy Omni E28 totals roughly $2,325 over five years against the Eureka J15 Max Ultra’s roughly $2,025, driven mainly by the E28’s $200 higher MSRP and its proprietary detergent line; neither figure includes a subscription.
Q.
Does either robot lock the owner into a proprietary consumable with no substitute?
The Omni E28’s automatically dosed detergent is vendor-supplied with no substitute path stated. The J15 Max Ultra’s consumables, bags, filters, pads and brushes, are standard replacement parts; Eureka states no equivalent locked-in chemical refill.
Next up
Do Robot Vacuums Keep Their Smart Features After Years?
