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Waterpik WP-583CD vs COSLUS C20: Compare Tank Size and Included Setup

Waterpik’s U.S. page for the blue WP-583 Cordless Advanced 2.0 lists a 7 oz (207 mL) reservoir; COSLUS lists 300 mL for C20 (F5020E). Waterpik lists four tips, magnetic USB-A charging, and travel accessories on its WP-583 base-model page; COSLUS lists five named tips and says its adapter is not included. Waterpik notes that packaging may vary, so confirm the exact WP-583CD offer contents. These listed capacities do not establish session duration or cleaning results.

Published by Pickoryx · Published 2026-10-19

Source checked 2026-10-19 09:18 UTC

Products compared

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The buying question

Which listed reservoir capacity and documented tip, travel, and charging setup better fits your refill and packing routine?

Waterpik’s U.S. page for the blue WP-583 Cordless Advanced 2.0 lists a 7 oz (207 mL) reservoir and four tips with magnetic USB-A charging and travel accessories; COSLUS lists 300 mL and five named tips for C20 (F5020E), and says its adapter is not included. Waterpik notes that packaging may vary, so confirm exact WP-583CD offer contents if the adapter or accessory bundle matters.

Quick verdict

Choose Waterpik Cordless Advanced 2.0 WP-583CD Water Flosser, Blue if

  • The listed 207 mL WP-583 reservoir and its base-model travel setup fit your refill and packing routine; confirm the exact WP-583CD offer contents because Waterpik says packaging may vary.
  • The Waterpik magnetic USB-A charging setup and four listed tips fit the charging and tip arrangement you want; verify the exact offer if adapter inclusion matters.
View Waterpik Cordless Advanced 2.0 WP-583CD Water Flosser, Blue on AmazonPaid link

Choose COSLUS C20 (F5020E) Cordless Water Flosser, Black if

  • The C20’s listed 300 mL reservoir is the capacity you prefer for refill planning.
  • The C20’s five named tips fit the setup you want, and you can supply a compatible 5 V adapter because COSLUS says one is not included.
View COSLUS C20 (F5020E) Cordless Water Flosser, Black on AmazonPaid link
When to skip: You want a countertop water flosser rather than a cordless handheld model.
When the recommendation changes
  • You need to know whether the exact WP-583CD offer includes a wall adapter or the full WP-583 base-model accessory list; Waterpik says packaging may vary.
  • The specific tip types or travel accessories matter more than the listed total tip count.
  • You do not have a compatible 5 V adapter for the C20, whose manufacturer says the adapter is not included.

The differences that matter

Reservoir Capacity And Refill Planning

Waterpik Cordless Advanced 2.0 WP-583CD Water Flosser, Blue

Waterpik’s U.S. page for the blue WP-583 Cordless Advanced 2.0 base model lists a 7 oz (207 mL) reservoir.[3]

COSLUS C20 (F5020E) Cordless Water Flosser, Black

The COSLUS C20 (F5020E) manufacturer page lists a 300 mL reservoir.[1]

What this changes: The manufacturer pages list 207 mL for the blue WP-583 base model and 300 mL for COSLUS C20. This compares listed capacity for refill planning; it does not establish how long either tank lasts or every detail of the WP-583CD retail package.[3, 1]

The better fit depends on your priorities

Controls Included Tips And Travel Setup

Waterpik Cordless Advanced 2.0 WP-583CD Water Flosser, Blue

Waterpik’s U.S. page for the blue WP-583 base model lists four tips, magnetic USB-A charging, a travel plug, bag and tip case, and says the wall adapter is not included on that base-model page. Waterpik notes packaging may vary; check the specific WP-583CD offer when adapter or accessory contents matter.[3, 2]

COSLUS C20 (F5020E) Cordless Water Flosser, Black

The C20 page lists five flossing tips—two standard tips plus orthodontic, periodontal and tongue-cleaning tips—and says the charging adapter is not included; it says a standard 5 V adapter may be used.[1]

What this changes: The Waterpik U.S. base-model page lists travel and charging accessories; COSLUS lists five named tips and says its adapter is not included. Waterpik says packaging may vary, so check the exact WP-583CD offer if adapter or accessory inclusion matters. The listed setup does not establish cleaning or performance.[3, 2, 1]

The better fit depends on your priorities

Value and trade-offs

One or both observed offers have eligibility conditions, so no unrestricted price difference is shown.

Any price difference should be weighed against the published tank capacity and the exact included accessories that matter to your routine; no price history or performance evidence is used here.

No price-history judgment is included because price history was not evaluated.

Limitations

  • Waterpik’s U.S. page identifies the blue WP-583 Cordless Advanced 2.0 base model and lists a 7 oz (207 mL) reservoir. It says packaging may vary; the exact contents of the WP-583CD retail offer, including adapter inclusion, should be checked on that offer.
  • COSLUS’s official page identifies C20 (F5020E) and lists a 300 mL reservoir and five tips. It says the adapter is not included and notes packaging may vary; confirm the exact U.S. listing contents.
  • No comparative use, cleaning, battery-life, comfort, safety, or reliability test was performed. The capacity figures describe listed reservoir size, not usage duration or cleaning results.
  • No current offer history was evaluated.

Questions shoppers ask

What reservoir capacities do the manufacturers list?

Waterpik’s U.S. page for the blue WP-583 Cordless Advanced 2.0 lists 7 oz (207 mL); COSLUS lists 300 mL for C20 (F5020E). These are listed reservoir capacities, not a measure of how long either tank lasts in your routine.

What is known about the wall adapter in each setup?

COSLUS says the C20 adapter is not included and that a standard 5 V adapter may be used. Waterpik’s WP-583 U.S. base-model page lists magnetic USB-A charging and says a wall adapter is not included; it also notes packaging may vary. Its WP-580-series manual specifies USB Type-A 5 V DC, 1 A if a charger is not supplied. Check the exact WP-583CD offer if package contents matter.

Methodology and sources

Compared manufacturer-listed reservoir capacity and documented tip, travel, and charging setup for the named cordless models. Waterpik’s U.S. page for the blue WP-583 base model lists 7 oz (207 mL), four tips, magnetic USB-A charging, travel accessories, and says packaging may vary; exact WP-583CD offer contents should be checked when a particular accessory matters. COSLUS identifies C20 (F5020E), lists a 300 mL reservoir and five named tips, and says its adapter is not included. Waterpik’s WP-580-series manual specifies a USB-A 5 V / 1 A charger only if a charger is not supplied. No oral-health, cleaning, comfort, safety, battery-life, or reliability outcome was tested.

AI assistance organized source research and drafted this feature-fit comparison; no hands-on use or oral-care outcome testing was performed.

View 3 sources
  1. 1.COSLUS C20 Water Flosser | 300mL Tank & 5 TipsCOSLUS · Official specifications · Source checked 2026-10-19 09:03 UTC
    Evidence used on this page
    • Product description and in-the-box list; FAQ on capacity and charging adapter.: Reopened COSLUS’s U.S.-market product page. It identifies C20 (F5020E), lists a 300 mL reservoir and five tips—two standard tips plus orthodontic, periodontal and tongue-cleaning tips—and says the adapter is not included; the FAQ says a standard 5 V adapter may be used. The page calls its functions cleaning modes; that count is not compared with Waterpik’s pressure-setting terminology.
  2. 2.Instruction Manual: Cordless Advanced 2.0 Water Flosser WP-580 SeriesWater Pik, Inc. · Official specifications · Source checked 2026-10-19 08:42 UTC
    Evidence used on this page
    • Pages 1 and 4–6: WP-580 Series title; device controls; USB charging; reservoir fill and tip replacement. Page 5 says USB adapter not included in all configurations.: Opened Waterpik's official WP-580-series manual. It describes the magnetic charging plug and, when a charger is not included, a user-supplied Type-A USB charger rated 5 V DC / 1 A; it explains the pressure/mode button, filling the reservoir and inserting/ejecting a tip. The series manual does not identify every retail bundle or its included tips.
  3. 3.Blue Waterpik Cordless Advanced 2.0 Water Flosser (WP-583)Water Pik, Inc. · Official specifications · Source checked 2026-10-19 09:18 UTC
    Evidence used on this page
    • U.S. product page: model/title lines 39–47; included tip and charging/travel setup lines 101–115; reservoir capacity lines 153–158; included-with-unit list lines 197–205. Page identifies the blue WP-583 Cordless Advanced 2.0 base model, lists 7 oz (207 mL), and notes packaging may vary.: Opened Waterpik’s U.S. product page for the blue WP-583 Cordless Advanced 2.0. It lists a 7 oz (207 mL) removable reservoir, four flossing tips, magnetic USB-A charging, a travel bag and travel plug, and says the wall adapter is not included on the base-model page. The page notes that packaging may vary. These are base-model manufacturer details; they do not establish every item in the exact WP-583CD retail offer.

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