These are the two best pool robots I’ve ever tested — and they’re both Dolphins. On my manometer, the Premier pulled 2.2 PSI, the highest reading in my logbook. The Sigma posted 2.0 — with a wider intake path, top-loading filters, and an app the Premier doesn’t have. One of them costs about twice as much as the other. Today, we’re settling it category by category: Premier vs Sigma — and exactly which one I’d drop in my own pool.
Hey guys, I’m Ryan with ActuallyUsed, where we put the products to the test so you don’t have to.
This is the matchup y’all ask about the most. The Premier and the Sigma sit at the top of Dolphin’s ProLine, and they’ve both spent weeks in my pool. Both are excellent. But they are not the same robot — and depending on your pool, one of them is the better buy. Let’s dive in.
How I Test (and Why PSI, Not GPH)
Quick refresher, because this is what separates ActuallyUsed from the spec-sheet reviews. Every robot runs in this pool for weeks — not a day, not a weekend. For suction, I hook a hydro manometer directly to the intake port and measure PSI underwater. As far as I know, we started that test in this category, and it’s still the number nobody else shows you.
Here’s why it matters: manufacturers publish GPH — gallons per hour through the pump. That’s a flow number, and it’s fine for what it is. PSI at the port measures pull — how hard the robot grabs debris off your floor. Both numbers are real; they just answer different questions. And at this point, my logbook covers manometer readings on more than two dozen robots, plus tape-measured intake ports on over 40. So nothing that follows is a feeling. It’s my data.
Round 1 — Suction
With the manometer sealed on the intake port, the Premier pulled 2.2 PSI on my gauge — the strongest reading I’ve logged on any robot, from any brand. The Sigma posted 2.0.
So the Premier takes the raw number by two-tenths. But before you close the tab, here’s my theory on that gap — and I want to be clear, it’s a theory, not something I’ve proven. The Sigma’s total intake path is a half-inch wider than the Premier’s, and the Sigma is actually running three motors to the Premier’s two. Spread that pull across a bigger opening, and I’d expect the reading at any single port to come in a touch lower — even if the total pickup in the pool is every bit as strong. So in my opinion, that 2.0 isn’t the Sigma being weaker. It may just be the Sigma taking a wider bite.
In the water, they both do first-pass pickup: fine sand, algae dust, waterlogged leaves, gone — no bow wave of debris getting pushed around the floor.
Round one: Premier. Barely.
The Top of the Leaderboard — Where Clear UV & Quantum Pro Land
Quick zoom-out, because I know y’all will ask how these two stack up against the rest of my logbook. Only four robots have ever cracked 1.9 PSI on my manometer — and every single one of them is corded.
| Robot | PSI (my manometer) | Today |
|---|---|---|
| Dolphin Premier | 2.2 | Contender #1 |
| Clear UV | 2.09 | Full review available |
| Dolphin Sigma | 2.0 | Contender #2 |
| Dolphin Quantum Pro | 1.9 | The value door into this tier |
At the top, the Premier at 2.2. Right behind it, the brand-new Clear UV at 2.09 on my gauge — it slots right between today’s two and layers UV sanitation on top, and it has its own full review. Then the Sigma at 2.0. And closing out the club, the Dolphin Quantum Pro at 1.9 — if both of today’s robots stretch the budget, the Quantum Pro is the value door into this tier. Below that, there’s a gap: the rest of the field — corded and cordless — clusters from 1.5 on down, and nothing battery-powered I’ve tested has hit 2.0. The top of my leaderboard is all corded, and today’s matchup owns two of the top three spots on it.
Round 2 — Intake Width
Suction is half the equation. The other half is how wide a bite the robot takes on every pass — and since almost nobody publishes that spec, I measured it myself. Tape measure, over 40 robots.
The Premier runs two ports at 4.75 inches each: 9.5 inches of total intake path. The Sigma runs two at 5 inches each: an even 10. For context, the average port in my dataset is right around six inches — so both of these are in a different class than most of the market. Between the two, the Sigma’s extra half-inch means slightly fewer passes to cover the same floor, and slightly fewer chances for a leaf to skate past the port on a turn.
Round two: Sigma. Also barely. Are you sensing a pattern yet?
Round 3 — Filtration
Both robots run NanoFilters — the ultra-fine pleated cartridges that grab the silt and algae-sized particles most robots just push around. In my experience, that pleated media out-filters the see-through mesh baskets a lot of robots ship with, and it’s a big part of why both of these leave the water noticeably clearer. And the amount of junk these things pull out of a clear-looking pool still surprises me — the cartridges come out packed, every single week.
The difference is the system around the cartridges. The Premier’s MultiMedia setup gives you three options in the box: a leaf bag for the heavy seasonal dumps, standard cartridges for everyday grit, and NanoFilters for the fine stuff. If you’ve got trees hanging over your pool, that leaf bag is a real weapon — and the Sigma doesn’t have one.
The Sigma answers with the top-load design, and this might be my favorite thing about owning it. Pop the top, lift the two oversized cartridges straight out, rinse, done. No flipping a heavy, dripping robot onto its back on the deck — which is exactly what the Premier and most other robots make you do.
So the Premier wins on versatility, and the Sigma wins on the chore you repeat every single week. In my experience, the thing you do fifty times a year matters more than the thing you do twice a season.
Round three: Sigma — unless leaves rule your backyard, in which case flip this round to the Premier.
Round 4 — Automation
Here’s where they link arms. Both have AutoStart with a weekly smart timer: set the schedule once, and the robot wakes up and cleans on the days you picked. No recharging, no babysitting, no remembering. Drop it in Monday, rinse the filters on the weekend — one interaction a week.
Compare that to the cordless routine all over your feed: fish it out, carry it dripping to an outlet, charge it for hours, walk it back. Call it 14 separate interactions a week to get daily cleanings. Wall power is what makes true automation possible, and both of these have it. Both also run 2.5-hour cycles and can go again back-to-back after a storm dumps half a tree in your pool.
And how much does a cordless robot fade across a full charge? That’s exactly what my battery drain-down test is built to measure. I’m running it right now, so subscribe if you want those numbers the day they’re ready.
Round four: dead even.
Round 5 — Navigation
Both use SmartNav to map the pool instead of bouncing around at random, and both climb and scrub the waterline instead of stalling and sliding back down. The Premier runs SmartNav 2.0, and it navigates well — efficient lanes, no grinding in corners. The Sigma runs the newer SmartNav 3.0 with a gyroscope, and in my testing you can see it: visibly straighter lanes, quicker recoveries off obstacles, fewer wasted laps over floor it already covered. The Premier navigates like a pro. The Sigma navigates like it’s showing off.
Round five: Sigma, by a nose.
Round 6 — The App
And here’s the round that decides the whole fight for a lot of you. The Sigma comes with the MyDolphin Plus app — and in my testing, it actually works, which is not a given in this category. More than one robot I’ve reviewed dropped its app connection the second it went underwater. The Sigma held its link the entire cycle. Weekly schedules, cleaning modes, steering it to a trouble spot, checking progress from the couch — all without walking outside. One caveat from my setup: it connects over Wi-Fi, so if your pool sits outside your Wi-Fi range, you’re limited to Bluetooth.
The Premier has no app. You set the schedule right on the power supply — every day, every other day, or every third — and that’s the whole relationship. Plenty of you will read that as a downside. Some of you will read it as one less thing to break.
Round six: Sigma, and it’s not close.
“But What About the Cord?”
I hear you already — the cord. Both of these ship with a 60-foot anti-tangle swivel cable, and across weeks of daily cycles with each robot, I haven’t untangled either one a single time. The swivel lets the robot spin and change direction without twisting the cable into knots. The cordless brands solve this problem by deleting the cord entirely — and my leaderboard shows exactly what that costs in suction. This is the problem solved with engineering instead. If the cable is the only thing holding you back, in my experience, it shouldn’t be.
The Time Math
Time is the whole reason to buy a robot, so here’s mine. Manual vacuuming and brushing ran me one to two hours a week. A cordless robot needs about ten minutes of handling every single day — call it 70 minutes a week. The Premier or the Sigma? About ten minutes once a week to rinse the filters. Either one hands you back an hour or more every week — north of 40 hours a year — just from not babysitting pool equipment. And on this scoreboard, they’re identical.
Price & the Real Question
Now the part that makes this interesting. The Premier retails around $1,500. The Sigma tops the ProLine at around $3,000 retail — you can usually find it on sale for well under that, but even on a good day, you’re paying a real premium for the flagship. And one knock I have to give at that tier: the Sigma’s new Active Center Brush is a paid add-on. When you’re paying top dollar for the best of the best, you expect all the performance parts in the box. If your current robot hangs up on the main drain, by the way, I’ve got free fixes and my favorite drain clips coming at ActuallyUsed.com/Robot-Stuck-On-Drain.
In my opinion, stretched over five years of ownership — the hours you’re not spending on maintenance, the load the filtration takes off your main system — the gap between these two shrinks. But it never disappears. So the real question isn’t whether the Sigma is better equipped. It is. The question is whether the app, the top-load filters, the gyroscope, and that extra half-inch are worth the extra money.
Verdict
So who wins? Let me give it to you straight.
If I could only keep one in my pool, it’s the Sigma — by a nose. The app that works underwater, the top-load filters I never dread rinsing, the wider intake path, the straighter lanes. The polish is real, you feel it every single week, and my theory says the two-tenths of a PSI it gives up on my gauge is more about geometry than muscle.
But the Premier might be the smarter buy for most pools. The strongest pull I’ve ever measured, the most flexible filtration in the lineup — including the only leaf bag between them — the same set-it-and-forget-it automation, for a lot less money. If you’d never open the app anyway, the Premier gives up almost nothing.
Put it in backyard terms: if leaves rule your yard and your phone stays in your pocket, get the Premier. If fine dust, sand, or pollen runs your pool — like it does mine here in Texas — and you like the idea of steering your robot from the couch, get the Sigma.
That’s what this really comes down to: is the app — and the polish around it — worth the extra? For me, barely, yes. For you, maybe not. Either way, in my testing these are the two best pool cleaners you can buy, and there’s no wrong answer between them.
Head-to-Head Summary
| Category | Dolphin Premier | Dolphin Sigma | My Edge |
|---|---|---|---|
| PSI on my manometer | 2.2 | 2.0 | Premier |
| Total intake path | 9.5" (2 × 4.75") | 10" (2 × 5") | Sigma |
| Motors | 2 commercial-grade | 3 commercial-grade | Sigma |
| Filtration options | MultiMedia: leaf bag + standard + NanoFilters | Standard + oversized NanoFilters (no leaf bag) | Premier |
| Filter access | Flip the unit | Top-load | Sigma |
| Automation | AutoStart + weekly timer (power supply) | AutoStart + weekly timer + app scheduling | Even |
| Navigation | SmartNav 2.0 | SmartNav 3.0 + gyroscope | Sigma |
| App | None | MyDolphin Plus (Wi-Fi) | Sigma |
| Cable | 60-ft anti-tangle swivel | 60-ft anti-tangle swivel | Even |
| Price | ~$1,500 | ~$3,000 retail (often on sale under) | Premier |
| Overall | The value pick | The complete package | Sigma, by a nose |
Quick recap before I let you go: the Premier takes raw suction and price, and it’s the only one here with a leaf bag. The Sigma takes the intake path, the top-load filters, the navigation, and the app. Dead even on automation and the anti-tangle cable. Overall — Sigma, by a nose, if the app is worth it to you.
The full deep-dives are in my Premier review and Sigma review, and the best deals I can find on both robots are on the deals page, which I keep updated. If you own either of these, tell me your numbers in the comments — and if there’s a robot you want on the manometer next, same place. Thanks for watching — I’ll catch you on the next one!
