Dolphin Sigma versus Dolphin T55i
Head-to-Head Review and Comparison
|Pool Type||In Ground|
|Pool Type||In Ground|
Dolphin's Best Pool Robot Yet - More Features, More Filters, & More Power.
Most Advanced Dolphin Ever - Utilizes Gyroscope
Includes NanoFilters - Unlock a Deeper Clean
Quad Scrubbing Brushes - 4X Cleaning Power
Utilizes 3 Dolphin ProLine Commercial-Grade Motors
Pricey, but Fantastic Value
No Leaf Bag
Energy Efficient Motors
Anti-Tangle Swivel - Prevents Tangles
2 High Speed Scrubbing Brushes
Schedule Cleanings - Run every 24, 48, or 72 hours
Restocking Fee Up to 20%
Not a great value when compared to alternative robots
Better Value Units Avaliable
Lacks multiple filter options - Similar units come with 2+
Shorter Warranty Than Premium Robots
NanoFiltersNext Gen Filtration Captures More.
Introduced as a part of the Dolphin ProLine, high-tech, plated filters are able to capture microscopic algae, debris, sand, and more in your pool water - all while increasing water clarity. To use, just simply snap them in and your robot is ready. NanoFilters are a must have for any pool robot.
Waterline / Tileline CleaningClean where other robots can't.
90% of the bacteria in your pool is on the waterline. Don't get confused with robots that are "Wall Climbing". There is a big difference. Waterline cleaning means the actively scrubs and sticks to the waterline scrubbing away this problem area in the pool. It is a feature you don't want to miss.
Wall ClimbingProvides floor and wall coverage
Wall climbing allows the robot to clean and climb the walls of your pool. However, don't get this confused with waterline cleaning. A robot without waterline cleaning will only clean the walls of your pool. It will miss the dirtest part of your pool, the waterline, where 90% of all algae and bacteria is in your pool. Make sure to check out waterline cleaning units here waterline cleaning robots
SmartPhone AppControl the from anywhere.
With its SmartPhone App, you can schedule cleanings, manually control, and fine tune your .
GyroscopeGyroscopic Sensors allow the to Navigate Your Pool With Ease
Gyroscopes detect the orientation of the robot by measuring linear acceleration and the angular rotational velocity. The advanced sensors monitor and control position, orientation, direction, and rotation. The 's gyroscope sensors provides constant, precise information to the microprocessor for more effective cleaning coverage, superior climbing and wall/waterline cleaning.
Anti-Tangle SwivelNo more tangled cords.
With an Anti-tangle Swivel, the can fully explore and clean your pool without ever getting stuck. The innovative design allows the robot to move freely 360 degrees around your pool, without ever knotting the cord.
Ultra EfficientSave Hundreds of Dollars Cleaning Your Pool a Year!
A robotic pool cleaner saves hundreds of dollars a year in energy when compared to pressure-side or suction-side cleaners. Powered by energy efficient DC motors, a robotic pool cleaner can be 90% more efficient than its pressure-side and suction-side counterparts.
Plug and PlaySimply Plug in and start cleaning!
Set up has never been easier. No installation needed. is ready to go right out of the box. No extra pumps, plumbing, or anything else needed. Simply plug and start cleaning!
Precise NavigationNavigate Any Obstacle
This technology ensures that the most effecient route is used to clean your pool floor. So smart, the system automatically navigates around obstacles and quickly returns to its route. You'll want to look for the SmartNav, as we found it performed best in our testing.
|Robot||Dolphin Sigma||Dolphin T55i|
|Pool Types||In Ground||In Ground|
|Pool Size||50 ft||50 ft|
|Pool Shape||Rectangle, Oval, or Freeform||Rectangle, Oval, or Freeform|
|Obstacles||Steps, Ladder, Drain Cover, Ledges, Pop-Ups||Steps, Ladder, Drain Cover, Ledges, Pop-Ups|
|Surface||Concrete, Plaster, Gunite, Pebble, Tile, Vinyl Liner, Fiberglass||Gunite, Fiberglass, Vinyl, Liner|
|Number of Filters Included||2||1|
|Filter Cleaning||Ultra-fine and Standard Filter Cartridge sets||Top Access|
|Cleaning Coverage||Floor, Walls, Waterline||Floor, Walls and Waterline|
|Cleaning Cycle(s)||2.5 hrs||1.5, 2 hrs|
|Number of Brushes||4||2|
|Remote operation||Yes - Through App||No|
|WiFi / Bluetooth||WiFi: Yes
|Automated Weekly Timer||Yes||Yes|
|Full Bag Indicator||Yes||No|
|Cable Length||60 ft||60 ft|
No Restocking Fee Ever.
No Restocking Fee Ever.
|Warranty||3 Years||2 Years|
|Caddy Included||Optional Caddies Available||Optional Caddies Available|
|Official Website||Sigma Official Site|
|Official Dolphin Sigma Comparison Page||Dolphin T55i vs Dolphin Sigma|
Terra CaddyThe Must-Have Accessory
Weather and UV-Resistant. Terra Caddy is the go-to Dolphin Caddy. Sealed and protected, the Terra Caddy is covered in a protect resin that cures to an extremely hard layer, making it resistant to scratches and weathering. The resin cures very hard, making it solvent-resistant and scratch-resistant. This level of protection makes the Terra Caddy stand up to rain, sunshine, termites, and more.
Dolphin CaddyEasy Transport and Cheap
A robotic pool cleaner is an investment, so make sure to protect it. The Dolphin Universal Caddy is a solid caddy that gets the job done. Easily store and transport your robotic pool cleaner to keep it lasting for years to come.
Replacement PartsNeed extra filters, replacement power supply, or new climbing rings?
Looking for replacement parts? Well, you've come to the right place. Shop all replacement parts for the and all other models.
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