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Waterpik Aquarius WP-660 vs Waterpik ION
The Waterpik Aquarius WP-660 edges it for most homes.
The verdict in 10 seconds
The Waterpik Aquarius WP-660 suits you if
- You wear braces or have implants, bridges, crowns or gum pockets
- Your gums are sensitive and you want fine control over pressure
- Several people in your home will share one flosser
Skip it if
- You want something cordless for the shower or for travel
- Your counter space near an outlet is very tight
- You have little patience for a splashy learning curve
The Waterpik ION suits you if
- You don't have an outlet near your bathroom sink
- You want a deep, dentist-fresh clean and like having lots of pressure choices
- You have braces, implants, or dentures and need specialty tips
Skip it if
- You're sensitive to noise or share a bathroom with light sleepers
- You want something small enough to toss in a travel bag
- You'd rather avoid a splashy learning curve at the sink
So, which one?
The Waterpik Aquarius WP-660 is the stronger all-rounder of the two. The Waterpik ION is still the better fit if you don't have an outlet near your bathroom sink.
We researched 10 expert reviews, analyzed 7,540 owner ratings and comments across 11 sources for the two, and cross-checked them into one verdict, so you don't have to.
Show me the receipts
The scoreboardProduct Review score 77 vs 70 · reliability 67 vs 58
| Waterpik Aquarius WP-660 | Waterpik ION | |
|---|---|---|
| Product Review score | 77 | 70 |
| Experts | 92 | 75 |
| Owners | 68 | 71 |
| Reliability | 67 | 58 |
| Report problems | 13% | 17% |
| Evidence | 5 reviews · 97 comments | 5 reviews · 143 comments |
| Typical price | $69–$100 | $90–$100 |
● marks the better number on each row.
Experts vs ownersExperts 92 vs 75 · Owners 68 vs 71
Waterpik Aquarius WP-660
Waterpik ION
How we reached each verdictThe numbers behind each model's score
Waterpik Aquarius WP-660
Expert support is strong: all 5 sources we analyzed name the Aquarius a top pick, and 4 of them used it hands-on, citing its 10 pressure settings, 22-ounce tank and specialty tips. Owners are cooler, with a community score of 68 against an expert score of 92; across 97 owner comments (38 first-hand), 15% describe it as messy, while 14% praise how well it cleans. Reliability scores 67, with 13% of comments mentioning failures and 5% saying a unit broke or died. Confidence is low: only one source published a score and we found no retail star ratings to cross-check owner sentiment.
Waterpik ION
Our research covered 5 hands-on expert evaluations, and 4 of 5 named the ION a best overall or top pick, citing thorough cleaning, a cord-free charging base and a large tank. Noise is the clearest weak spot: 3 of 5 experts flagged it as loud, and one dismissed it entirely for being overwhelmingly loud. Among 143 owner comments, 20% praise its cleaning, while 14% call it messy, 7% find it too strong and 7% say it broke or died. Overall, failure mentions reach 17%, and our reliability score of 58 rests on limited long-term data, so durability evidence is thinner than performance evidence. It holds a 4.1-star average across about 7,300 Amazon ratings.
Where each one falls shortThe most common complaints
Waterpik Aquarius WP-660
- Messy, with water spraying around the sink
- Bulky corded unit that takes up counter space
- Pressure can feel too strong, plus some reports of units dying
Waterpik ION
- Very loud during use
- Messy, with splashing and drooling
- Some units break or have battery problems
Questions people actually ask
Which is better, the Waterpik Aquarius WP-660 or the Waterpik ION?
The Waterpik Aquarius WP-660, for most homes. The Waterpik ION is the better fit if you don't have an outlet near your bathroom sink.
Based on: Product Review score 77 vs 70.Which is more reliable?
The Waterpik Aquarius WP-660. It's the least likely of the two to give you trouble.
Based on: Reliability 67 vs 58; problems mentioned by 13% vs 17% of owners.Which is easier to live with day to day?
It's a draw. Day to day, the two are about as satisfying.
Based on: Owners score 68 vs 71, from ratings and comments.Which is cheaper?
The Waterpik Aquarius WP-660 usually costs less.
Based on: Typical prices: Waterpik Aquarius WP-660 $69–$100; Waterpik ION $90–$100.As an Amazon Associate we earn from qualifying purchases. It never changes a score.