For shared-bathroom capacity and fine pressure control, get the Waterpik Aquarius WP-662; for travel, small bathrooms and shower use, get the Waterpik Cordless Advanced WP-582. The countertop WP-662 offers 10 pressure settings, 7 tips, a 22-ounce reservoir for 90-plus seconds of flossing, 1400 pulses per minute and a one-minute timer with 30-second pacer, while the cordless WP-582 offers 3 settings, 4 tips, a 7-ounce reservoir for up to 45 seconds, 1250 pulses per minute and magnetic USB recharging with global voltage. On 09/12/2026 the WP-662 This-item row was observed at $79.99 and the WP-582 This-item row at $78.67, both In Stock with Ships from and sold by Amazon.com and delivery Wednesday Sep 16 — a $1.32 gap that buys capacity and settings, not just a different shape. On both Amazon pages the variant buybox itself reads To see product details, add this item to your cart pending a delivery location, while the exact-variant handle-buy-box form still exposes a quantity selector with Add to cart and Buy Now, Shipper and Seller Amazon.com, and 30-day refund and replacement.
Choose by your situation
| Situation | Model to consider | Main tradeoff |
|---|---|---|
| Family bathroom or braces and implants where several people share one countertop unit and want fine pressure steps | Aquarius WP-662 | Needs a North America 120V outlet and counter space at 10.35 in tall and 1.46 lb; corded-only, so no travel or shower use. |
| Small bathroom, travel or shower use where a cordless handle, travel bag and global voltage matter more than tank size | Cordless Advanced WP-582 | Only up to 45 seconds per fill on a 7-ounce reservoir, so most sessions need at least one refill; 3 settings instead of 10. |
Countertop capacity against cordless portability, side by side
| Criterion | Aquarius WP-662 | Cordless Advanced WP-582 |
|---|---|---|
| Form and power | Countertop, corded electric, 52-inch cord, North America only 120VAC and 60Hz | Handheld rechargeable, lithium-ion with magnetic USB charging, global voltage compatible |
| Pressure settings and modes | 10 settings on a base dial plus 2 flossing modes, Floss and Hydro-Pulse Massage; manual primes at pressure setting No. 10 | 3 settings, HIGH, MEDIUM and LOW by mode and pressure button per the WP-580 series manual; no massage mode in the observed material |
| Tips included | 7 tips: 4 Precision JT-100E, 1 Orthodontic OD-100E, 1 Pik Pocket PP-100E, 1 Plaque Seeker PS-100E; 360-degree rotating tip handle | 4 tips: 2 Precision handheld cordless JT-450E, 1 Orthodontic, 1 Plaque Seeker; 360-degree rotating tip |
| Reservoir and run profile | 22 ounces (651 ml), 90-plus seconds stated; 13 ounces (384 ml) per minute flow; 1400 pulses per minute | 7 ounces (207 ml), up to 45 seconds stated; 10 ounces (296 ml) per minute flow; 1250 pulses per minute |
| Guidance and noise framing | One-minute timer with 30-second pacer in Floss mode only, LED information panel | Maker-described ultra-quiet and extra-quiet design; LED charging and pressure indicators; stated run time up to 4 weeks; rapid 4-hour recharge framing on the maker page |
| Travel and shower | Not portable; no travel bag, no shower-use statement in the observed material | Microfiber travel bag, travel plug and tip case included; maker states may be used in the shower |
| Size and weight | 10.35 in tall with tip, 4.70 by 3.80 in base, 1.46 lb unit weight | 11.60 in tall with tip, 2.80 by 4.00 in footprint, 0.80 lb unit weight |
| Warranty and approvals | 36-month limited warranty; ADA Accepted; replace tips every 3 to 6 months per maker care guidance | 24-month limited warranty; ADA Accepted; USB Type A 5VDC 1A charger spec per manual, wall adapter not included in all configurations; magnetic-field pacemaker note |
| Observed Amazon US listing | This-item $79.99 on 09/12/2026, Wednesday Sep 16, In Stock, Ships from and sold by Amazon.com; New (3) from $79.99 | This-item $78.67 on 09/12/2026, Wednesday Sep 16, In Stock, Ships from and sold by Amazon.com; New (5) from $69.99 |
| Listing reputation signals | 4.6 out of 5 stars across 157,817 ratings; 800-plus bought in past month | 4.2 out of 5 stars across 77,961 ratings; 1K-plus bought in past week |
Aquarius WP-662: the capacity and control pick
The Aquarius WP-662 suits a fixed bathroom station: ten pressure steps plus a dedicated massage mode cover sensitive gums through braces and implants, seven tips span precision, orthodontic, Pik Pocket and Plaque Seeker needs, and the covered 22-ounce reservoir delivers 90-plus seconds without a mid-session refill. The one-minute timer with 30-second pacer structures a full mouth routine, and the handle water on-off slider avoids trips back to the base. Its limits are placement and power: it needs counter space and a North America 120V outlet with its 52-inch cord, at 1.46 lb before water, and the 36-month warranty still points to the owners manual for terms. At a $79.99 This-item observation with Amazon.com as shipper and seller and 30-day refund and replacement, it is the shared-household capacity answer.
Cordless Advanced WP-582: the travel and small-bathroom pick
The Cordless Advanced WP-582 suits portability: the handheld lithium-ion handle with magnetic USB charging and global voltage packs into the included microfiber bag with a travel plug and tip case, the maker states shower-safe use, and the ultra-quiet framing plus push-button water control fit apartments and dorms. Its limits are capacity and granularity: the 7-ounce reservoir gives up to 45 seconds, so plan on refilling mid-routine, and three HIGH, MEDIUM and LOW settings replace the ten-step dial. The 24-month warranty is shorter, the manual specifies a USB Type A 5VDC 1A charger with the wall adapter not included in all configurations, and pacemaker wearers should note the magnetic-field caution. At a $78.67 This-item observation with Amazon.com as shipper and seller and 30-day refund and replacement, it trades tank size for freedom of movement.
Where to check the exact variants
Compare the Aquarius WP-662 Black countertop unit with 10 settings and 7 tips (This-item row observed at $79.99 on 09/12/2026, Wednesday Sep 16, In Stock, shipped and sold by Amazon.com, with quantity selector, Add to cart, Buy Now, Shipper and Seller Amazon.com and 30-day refund and replacement) against the Cordless Advanced WP-582 Black handheld unit with 3 settings, 4 tips and travel bag (This-item row observed at $78.67 on 09/12/2026, Wednesday Sep 16, In Stock, shipped and sold by Amazon.com, with the same exact-variant purchase controls). Both links go to Amazon US. Either pick carries the ADA Accepted mark; the countertop extends sessions and settings, the cordless extends where flossing can happen.
Sources and further reading
- Amazon.com — Waterpik Aquarius Countertop Water Flosser WP-662 Black (B01LXY19XD)
- Amazon.com — Waterpik Cordless Advanced Portable Water Flosser WP-582 Black (B01GNVF8BK)
- Waterpik — Aquarius Water Flosser WP-662 product page
- Waterpik — Cordless Advanced 2.0 Water Flosser WP-582 product page
- Waterpik — 600 Series instruction manual (covers WP-662)
- Waterpik — WP-580 Series instruction manual (covers WP-582)