# AUIEI Y209 Water Flosser, 300ml, 5 Modes, USB-C

Source: https://www.ranked10.co.uk/home/best-water-flossers/auiei-water-flosser-y209
Ranked #7 in "Best Water Flosser 2026: 10 Ranked, and Why the Cheapest Wins": https://www.ranked10.co.uk/home/best-water-flossers

- Price: £19.99 (checked on Amazon UK on 2026-09-15)
- Amazon rating: 4.3 from 6,399 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B0BZPQR9SR?tag=ranked10-21

The AUIEI Y209 is a cordless water flosser with a stated 300ml tank, five cleaning modes, four nozzles and a USB-C rechargeable battery. At £19.99 it is the cheapest model in this guide, and it takes the number 7 slot on the strength of one comparison: it carries 6,399 ratings at 4.3, while the £69.99 Waterpik Cordless Advanced carries 6,194 at 4.2. Almost the same number of buyers, roughly a third of the money, and the cheaper listing is the one that actually publishes a tank volume.

The listing is not tidy, though. It describes a 300ml tank and a 1,500mAh battery charged over USB-C in 4-6 hours, but the specification table underneath also says "3 A batteries required. (included)", which cannot both be true of the same device. The description claims "about 21 days of continuous use" from that 1,500mAh cell and never gives a minutes-per-charge figure to check it against. Everything on this page comes from the Amazon listing for the AUIEI Y209 — the prices, ratings, modes and claims are the seller's, not the result of any testing we have done.

## Specification

| Field | Value |
|---|---|
| Price | £19.99 |
| Amazon rating | 4.3 out of 5, from 6,399 ratings |
| Tank volume | 300 millilitres |
| Pulse frequency and pressure | 1,400-1,800 pulses per minute at 30-110 PSI (as listed) |
| Modes | 5 (Strong, Normal, Soft, Pulse, Child) with memory function |
| Waterproofing | IPX7 |
| Battery | 1,500mAh, USB-C, 4-6 hours to charge, "about 21 days of continuous use" (as listed) |
| Batteries field | 3 A batteries required, included — the same listing describes a built-in USB-C battery (as listed) |
| Size and weight | 25 x 8 x 7 cm; 380 g |
| Bestsellers rank | 38th in Power Flossers & Irrigators |

## Questions people ask

**How big is the water tank on the AUIEI Y209?**

The listing states 300ml, in a detachable tank that can be filled either through the large top opening or by removing it.

**How many pressure settings does the AUIEI Y209 have?**

Five: Strong, Normal, Soft, Pulse and Child. The listing says it remembers the mode you used last, and runs at 1,400-1,800 pulses per minute at 30-110 PSI.

**Is the AUIEI Y209 waterproof?**

The listing gives it an IPX7 rating and describes the tank as detachable for regular cleaning to avoid water residue.

**How long does the AUIEI Y209 take to charge?**

The listing says 4-6 hours for the 1,500mAh battery, which it claims gives "about 21 days of continuous use". It does not say how many minutes of flossing that works out to per charge.

**Does the AUIEI Y209 take disposable batteries?**

The specification table says "3 A batteries required. (included)", while the description says the flosser has a 1,500mAh battery charged by USB-C. Both statements appear on the same listing.

**How loud is the AUIEI Y209?**

The listing claims the pump runs at less than 55db; no independent measurement is given.