Waterpik
Waterpik Aquarius WP-660
$99.99Cheaper
Released 2013
Best Water Flossers · head-to-head
Waterpik Aquarius WP-660 vs Panasonic EW1511
A sourced, side-by-side comparison. Waterpik Aquarius WP-660 is cheaper at $99.99. Every spec and price links to its source.
Panasonic
Panasonic EW1511
$109.99
Released 2019
Which is better: the Waterpik Aquarius WP-660 or Panasonic EW1511?
On the specs we track, they're closely matched. The Waterpik Aquarius WP-660 is the cheaper at $99.99.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Waterpik Aquarius WP-660 | Panasonic EW1511 |
|---|---|---|
| US price | $99.99 | $109.99 Price from shop.panasonic.com |
| Brand | Waterpik | Panasonic |
| Released | 2013 | 2019 |
| Type | countertop | cordless |
| Tank capacity (ml) | 651 | 200 |
| Pressure settings | 10 | 5 |
| Max pressure (psi) | 100 | 94 |
| Tips included | 7 | 2 |
| Power | corded | rechargeable |
| Runtime min | 1.5 | 1 |
| Release | 2013 | 2019 |
Sources — Waterpik Aquarius WP-660: waterpik.com (verified 2026-06-19). Panasonic EW1511: shop.panasonic.com (verified 2026-06-19).
What's the difference between the Waterpik Aquarius WP-660 and Panasonic EW1511?
Where the two actually differ on the specs we track (7 of 7). Matching specs are omitted.
- Type: Waterpik Aquarius WP-660 countertop vs Panasonic EW1511 cordless
- Tank capacity (ml): Waterpik Aquarius WP-660 651 vs Panasonic EW1511 200
- Pressure settings: Waterpik Aquarius WP-660 10 vs Panasonic EW1511 5
- Max pressure (psi): Waterpik Aquarius WP-660 100 vs Panasonic EW1511 94
- Tips included: Waterpik Aquarius WP-660 7 vs Panasonic EW1511 2
- Power: Waterpik Aquarius WP-660 corded vs Panasonic EW1511 rechargeable
- Runtime min: Waterpik Aquarius WP-660 1.5 vs Panasonic EW1511 1