Robot Vacuums · Head to head

Dreame L40 Ultra Gen 2 vs iRobot Roomba Plus 515 Combo Robot + AutoWash Dock

Full Robot Vacuums comparison in 2026

Updated October 2026
Data from the official Dreame and iRobot sites.
2026 verdict
Chasing the strongest suction on the dock?
Dreame L40 Ultra Gen 2
Winner
Dreame L40 Ultra Gen 2
$499.98$749.9933% OFF
Buy on Amazon USA
The Dreame L40 Ultra Gen 2 leads this pair, with stronger suction, a longer battery life and a 3-year warranty against 1 year on the iRobot Roomba Plus 515 Combo Robot + AutoWash Dock. Both docks empty, wash and dry the mop pads on their own, and the iRobot Roomba Plus 515 Combo Robot + AutoWash Dock answers back with a noticeably lower 84mm body that clears more furniture. Buyers who want the strongest suction, the longer warranty and a lower price should choose the Dreame L40 Ultra Gen 2; buyers whose low furniture rules out a taller robot may still prefer the iRobot Roomba Plus 515 Combo Robot + AutoWash Dock.
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FeatureDreame L40 Ultra Gen 2iRobot Roomba Plus 515 Combo Robot + AutoWash DockWinner
Price$499.98$599.00Dreame L40 Ultra Gen 2
Rating4.34.2Dreame L40 Ultra Gen 2
Warranty3 years1 yearDreame L40 Ultra Gen 2
Battery Life231 minutes200 minutesDreame L40 Ultra Gen 2
Connectivity2.4 GHz WiFi2.4 GHz WiFi, BluetoothiRobot Roomba Plus 515 Combo Robot + AutoWash Dock
IntegrationsGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterGoogle Home, AlexaDreame L40 Ultra Gen 2
Suction Power25000Pa22000PaDreame L40 Ultra Gen 2
Auto RechargeYESYESTie
Navigation TypeLaser (LiDAR)Laser (LiDAR)Tie
Obstacle DetectionYESYESTie
Cliff DetectionYESYESTie
Multi-Room MappingYESYESTie

What the differences mean

Suction power

25000Pa against 22000Pa keeps the Dreame L40 Ultra Gen 2 slightly ahead, though both are strong enough for pet hair and everyday carpet dirt.

Battery life

231 minutes against 200 gives the Dreame L40 Ultra Gen 2 a longer single run before it needs to recharge.

Warranty

The Dreame L40 Ultra Gen 2 carries a 3-year warranty against 1 year on the iRobot Roomba Plus 515 Combo Robot + AutoWash Dock, a real gap on a purchase meant to last years.

Smart home reach

Dreame lists Apple Home, Samsung SmartThings, Home Assistant and Matter as an upcoming OTA update on the L40 Ultra Gen 2, not yet live. The iRobot Roomba Plus 515 Combo Robot + AutoWash Dock supports none of those today, only Google Home and Alexa.

Body height

The iRobot Roomba Plus 515 Combo Robot + AutoWash Dock stands lower at 84mm against 97mm on the Dreame L40 Ultra Gen 2, so it clears a few more beds and sofas.

Price

The Dreame L40 Ultra Gen 2 is typically the more affordable of the two, on top of its edge in suction, battery and warranty.

Which one to buy if

What owners say

Owners of both docks describe hands-off maintenance as the main reason to buy, but each has its own snag. Dreame L40 Ultra Gen 2 owners praise the strong suction on pet hair and mixed flooring and the extendable side brush for reaching corners other robots miss, though several report hair tangling in the wheels or main brush over time, occasionally throwing off the mapping, and the auto-detergent dispenser is a separate purchase rather than something in the box. iRobot Roomba Plus 515 Combo Robot + AutoWash Dock owners like the strong suction and a low body that fits under more furniture, and are glad the dock empties and washes the pads on its own, but say the mop pads can snag on cords left on the floor and the dirty water tank needs emptying promptly or it starts to smell.

Frequently Asked Questions

Which robot vacuum wins between the Dreame L40 Ultra Gen 2 and the iRobot Roomba Plus 515 Combo Robot + AutoWash Dock?

The Dreame L40 Ultra Gen 2 is the better robot vacuum overall, leading on warranty, suction power and battery life. The iRobot Roomba Plus 515 Combo Robot + AutoWash Dock stays in the conversation with a slimmer body that clears more furniture.

What is the biggest difference between the Dreame L40 Ultra Gen 2 and the iRobot Roomba Plus 515 Combo Robot + AutoWash Dock?

Warranty and suction. The Dreame L40 Ultra Gen 2 carries a 3-year warranty and slightly stronger suction, while the iRobot Roomba Plus 515 Combo Robot + AutoWash Dock is covered for 1 year and sits at 22000Pa.

Which one fits under low furniture better?

The iRobot Roomba Plus 515 Combo Robot + AutoWash Dock, at 84mm tall against 97mm on the Dreame L40 Ultra Gen 2.

Do either of these work with Apple Home or Matter today?

Not yet. The Dreame L40 Ultra Gen 2 lists Apple Home, Samsung SmartThings, Home Assistant and Matter as an upcoming OTA update, while the iRobot Roomba Plus 515 Combo Robot + AutoWash Dock supports none of them, only Google Home and Alexa.

Who should buy the Dreame L40 Ultra Gen 2?

Buyers who want the strongest suction, the longer warranty and a lower price, and are comfortable with smart-home extras arriving later by firmware update.

Who should buy the iRobot Roomba Plus 515 Combo Robot + AutoWash Dock?

Buyers whose low beds or sofas need the shorter 84mm body, and who mainly want strong suction with a self-washing dock.

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