TLDR
On published specs, the Hydrator Max claims the highest output (up to 10,000 ppb) and the largest capacity (14 oz). Echo's Flask links a lab report and an app. Piurify's Hydrogenator is the smallest and links a lab figure of 4.1 mg/L. I make the Hydrator Max, and every figure here is the maker's own claim.
The three bottles side by side
I read each maker's product page in October 2026. "Not published" means the page did not say. I left out prices and warranties.
| Spec | Dr. Water Hydrator Max | Echo Flask | Piurify Hydrogenator |
|---|---|---|---|
| Claimed max hydrogen | Up to 10,000 ppb | Up to 8 ppm | Up to 6,300 ppb |
| Cycle times | 5 min (about 3,000 ppb); 10 min (up to 10,000 ppb) | 10 min (6 ppm); 20 min (8 ppm) | 5 min (2,500 ppb); 10 min (4,000 ppb); stack up to 3x |
| Capacity | 14 oz (400 ml) | 12 oz (0.36 L) | 10 oz (280 ml) |
| Body | Food-grade BPA-free plastic | PPSU plastic | Not published |
| Generator | Platinum proton-exchange membrane; titanium-platinum electrodes | PEM; platinum-coated titanium plates; oxygen vent port | SPE/PEM, platinum-coated electrolysis |
| Battery | 4,500 mAh; 30+ cycles per charge; USB-C | 5 to 7 cycles of 10 min; 3 to 4 of 20 min | Not published for this model |
| Self-clean | UV self-clean cycle | Not published | Comparison chart lists a self-cleaning program; model not clear |
| App | No app; touchscreen | Yes, Echo Water app | Not published |
| Test report on page | Not published (no dissolved-hydrogen report linked) | H2 Analytics, Jan 2025: 6.07 mg/L at 10 min, up to 8.25 mg/L at 20 min, distilled water | H2 Analytics lists 4.1 mg/L; cycle not stated |
Sources: drwater.store, echowater.com and piurify.com product pages, October 2026. I have not tested these bottles.
Where each bottle leads
Dr. Water leads on three listed numbers: top claimed output, capacity and battery. It also lists a UV self-clean cycle. It trails on proof, because we link no ppb report.
Echo leads on proof and software. It publishes a gas chromatography report and offers an app that tracks cycles. Its top figure needs a 20-minute cycle, and the page gives up to 7 cycles per charge.
Piurify leads on flexibility in how you build a dose. You can stack deep-mode cycles up to 3 times. Its page also states hydrogen retention of up to 4 hours, a claim I could not check.
Features only one of the pages lists
- Dr. Water Hydrator Max: a touchscreen, a UV self-clean cycle, a 4,500 mAh battery rated at 30+ cycles per charge, and USB-C charging. The page says it has no app and no account.
- Echo Flask: a phone app, an oxygen vent port, and platinum-coated electrode plates described as having zero water contact.
- Piurify Hydrogenator: stackable deep modes, a stated hydrogen retention of up to 4 hours, and a nasal cannula listed in the box for optional inhalation.
The retention claim and the inhalation accessory are Piurify's own wording, and I have not tested either. Dr. Water's page says hydrogen stays strong for about 30 to 60 minutes. Those two retention claims differ widely, so measure the water yourself if it matters to you.
Water and care guidance on each page
All three makers say the water you use affects performance and bottle life. The wording differs.
| Topic | Dr. Water Hydrator Max | Echo Flask | Piurify Hydrogenator |
|---|---|---|---|
| Water to use | Cold or room-temperature filtered water | Page says distilled water was used in its lab test | Recommends filtered, distilled or RO water; says tap water can shorten bottle life |
| Water to avoid | Sparkling, alkaline, and hot water above 120°F | Not covered in the passages I read | Not covered in the passages I read |
| Cleaning | Rinse about weekly, no soap, run UV self-clean when needed | Not covered in the passages I read | Says tap water buildup may need more frequent cleaning |
| Battery tip | Charge by USB-C; about 10 to 14 days per charge for most people, per the page | Page says run it down before charging to keep battery readings calibrated | Not published |
| Normal quirks | Not published | Small drips from the oxygen port are described as normal | Not published |
None of this replaces the manual that ships with the bottle. If you buy any of the three, follow that manual first.
What you cannot compare from these pages
- Peak ppb across different cycle lengths and water types.
- Dr. Water's 10,000 ppb with Echo's 8.25 mg/L report. Ours has no report, and theirs used distilled water.
- Piurify's 6,300 ppb claim with its 4.1 mg/L lab figure. The page does not name the cycle.
For a deeper read on how to check any number, see is 10,000 ppb real. We also have one-to-one pages: Dr. Water vs Echo and Dr. Water vs Piurify.
How to pick between the three
- If a linked lab report matters most, start with Echo or Piurify.
- If capacity and battery matter most, compare the Hydrator Max's 14 oz and 30+ cycles per charge against the others.
- If you want the smallest bottle, look at Piurify's 10 oz.
- If you want an app, Echo is the one of these three that lists it.
For a wider view, read our best hydrogen water bottle buying guide and our portable PEM bottle guide.
Before you buy any of the three, open its page and check four things. Look at the cycle time behind the top figure. Look at the water type in any lab report. Look at the capacity. Look at how many cycles a charge gives you.
Those four items explain most of the gap between a headline number and what you get in the glass. Add the cleaning routine, because a bottle that is hard to keep clean tends to lose output over time.
FAQ
Which is better, Dr. Water, Echo or Piurify?
It depends on what you value. On published specs the Hydrator Max claims the highest output and capacity, Echo links a lab report and an app, and Piurify is the smallest. I make the Hydrator Max, so check each page yourself.
Which bottle has the highest ppb?
The Hydrator Max page claims up to 10,000 ppb, Echo claims up to 8 ppm on a 20-minute cycle, and Piurify claims up to 6,300 ppb on stacked deep cycles. These are maker claims.
Does Echo have a lab report?
Yes. Echo's Flask page links an H2 Analytics report dated January 16, 2025. It lists 6.07 mg/L after 10 minutes and up to 8.25 mg/L after 20 minutes on distilled water.
How big are these bottles?
The Hydrator Max holds 14 oz (400 ml), the Echo Flask 12 oz (0.36 L) and the Piurify Hydrogenator 10 oz (280 ml), per each maker's page.
Do these bottles use the same technology?
All three pages describe a platinum-coated PEM-type generator. Details such as venting, materials and battery differ, as the table shows.
If you want to read the Hydrator Max specs exactly as we list them, see the Hydrator Max product page.
