We have tested both the Dolphin Explorer E70 and the Dolphin Sigma in real pools, measured their suction at the intake, and lived with the filtration and daily routine each one requires. This comparison brings those results together so you can see the real-world trade-offs without relying on the numbers printed on either box.
Dolphin Explorer E70 and Dolphin Sigma are close enough in the same lineup that the feature and value differences matter as much as the badge.
The short answer: Dolphin Sigma is our pick. Its 2.0 PSI reading, wide intake, NanoFilters, and underwater app make it the most complete connected Dolphin. Meanwhile, the Dolphin Explorer E70 carries a not recommended call in our review and is only relevant for buyers who find a major discount and specifically want its connected controls.
Quick Answer
Buy the Dolphin Sigma when its strengths match your pool. Best for: buyers who want near-Premier power with full app control. It is the stronger choice across the measurements and ownership factors that matter in our testing.
We recommend skipping the Dolphin Explorer E70 for most pools (at its normal price, the premier and sigma deliver more suction and better filtration.), unless your single overriding priority is buyers who find a major discount and specifically want its connected controls.
Our calls in the full reviews are Not recommended for the Dolphin Explorer E70 and Recommended for the Dolphin Sigma. Those calls matter here: PSI is the first round, not the entire verdict.
Suction Power: 1.7 PSI vs 2 PSI
On our hydro manometer, the Dolphin Explorer E70 measured 1.7 PSI and the Dolphin Sigma measured 2 PSI. That gives the Dolphin Sigma a 0.3 PSI advantage, or about 18% more intake pressure than the lower reading.
We measure pressure directly at the intake with the same gauge and pool setup. That is different from manufacturer flow-rate claims in gallons per hour: GPH describes water movement, while PSI shows how hard the intake pulls on debris. Cordless results are recorded at full charge. Our complete pool-robot suction test explains the method and shows where both robots sit on the full board.
The number needs context. Its 1.7 PSI reading, navigation, app, and three-year warranty make it a capable cleaner. Its 2.0 PSI reading, wide intake, NanoFilters, and underwater app make it the most complete connected Dolphin. The stronger gauge result gets this round, though intake pressure alone cannot make up for a filter that lets fine debris escape or a routine that makes you handle the robot every day.
Filtration and Debris Handling
The Dolphin Explorer E70 uses top-loading mesh basket without the filter versatility of the proline picks. The Dolphin Sigma uses top-loading pleated nanofilter cartridges for fine dust, pollen, and silt.
We give the filtration edge to the Dolphin Sigma. Our comparison favors fine-particle capture, usable debris capacity, easy cleaning, and whether the better filter is included rather than sold as an upgrade.
For leaves, capacity and intake design matter. For pollen, silt, and the haze that dulls otherwise clear water, the filter media matters more. A basic mesh screen can look clean after a run while still passing the smallest material back into the pool.
Automation and Daily Work
The Dolphin Explorer E70 is corded. Connected app control and scheduled corded cleaning. The Dolphin Sigma is corded. MyDolphin Plus app works underwater and supports weekly scheduling.
Because both are corded, neither needs a recharge. The meaningful question is how much scheduling and remote control each power supply or app provides.
We score automation as a tie.
Coverage and Pool Fit
For the Dolphin Explorer E70, our review found floor, walls, and waterline with smart navigation. The Dolphin Sigma is built for floor, walls, and waterline with the widest intake path we have measured.
Coverage is a tie in our scoring, so choose around pool size, shape, and the surfaces you actually need cleaned.
This is where the runner-up can still be the smarter fit for specific pools. A compact pool does not benefit from paying for reach it cannot use, while a pool with a sun shelf, long waterline, or heavy leaf load can expose the limits of a simpler machine quickly.
Value: Performance for the Money and Time
Our value take on the Dolphin Explorer E70: Capable but overpriced beside stronger, better-filtering Dolphins. For the Dolphin Sigma: Expensive, but it combines elite suction, filtration, navigation, and app control.
The value edge goes to the Dolphin Sigma.
Value is not the same thing as the lowest checkout price. We count cleaning power, filtration, how many surfaces the robot covers, and how often you have to retrieve or charge it. A cheaper robot that leaves you vacuuming behind it is not a bargain, and an expensive robot only earns its price when its extra capability solves a real problem in your pool.
Which One Should You Buy?
- Buy the Dolphin Sigma when its strengths fit your pool. Best for: buyers who want near-Premier power with full app control. Its 2.0 PSI reading, wide intake, NanoFilters, and underwater app make it the most complete connected Dolphin.
- Skip the Dolphin Explorer E70 for most pools: Only consider it for buyers who find a major discount and specifically want its connected controls. At its normal price, the Premier and Sigma deliver more suction and better filtration.
- Know the main drawback: Dolphin Sigma — Its premium price is hard to justify if a power-supply timer is all the control you need. Dolphin Explorer E70 — At its normal price, the Premier and Sigma deliver more suction and better filtration.
Final Verdict
Dolphin Sigma wins this comparison. Dolphin Sigma wins the overall matchup. Its 2.0 PSI reading, wide intake, NanoFilters, and underwater app make it the most complete connected Dolphin. Dolphin Explorer E70 remains the better fit for buyers who find a major discount and specifically want its connected controls.
Read the complete Dolphin Explorer E70 review and Dolphin Sigma review for every test photo, setup detail, and long-form ownership note. You can also return to all pool-robot comparisons to see any other matchup from the 19 cleaners in our test set.
