Waterdrop G3P600
#4 in TanklessFull review
For a household that wants a certified tankless RO system with a smart faucet at a mid-range price. Its NSF 58 listing is the main reason to pick it over cheaper tankless units.
Amazon $439$439
3.4/5
For a busy kitchen that wants fast RO water and low waste from a certified system, and can pay for it.
- 800 gallons a dayOutput
- 3:1Pure to drain
- $160 a yearFilters
- YesNSF/ANSI 58
Check price at Amazon$849
Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Certified to NSF/ANSI 58, and an independent lab test showed about 95% of dissolved solids removed
- Wastes little water for an RO system
- Fills a 12 oz glass in about 9 seconds in independent testing
- The faucet shows water quality and filter life
Cons
- Costs about twice as much as the G3P600
- Only a 1-year warranty
- Needs a power outlet under the sink
The Waterdrop G3P family
Every Waterdrop G3P model we rank, smallest first. Ratings compare each against its own type.
| Model | Output | Rating | Price |
|---|---|---|---|
| Waterdrop G3P600 | 600 gallons a day | 3.6/5 | $439 |
| Waterdrop G3P800 (this one) | 800 gallons a day | 3.4/5 | $849 |
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Independent measurements
Dissolved solids reduction, output and drain ratio measured by independent testers.
| Tested by | TDS reduction | Output | Pure to drain | Conditions |
|---|---|---|---|---|
| Water Filter Guru | 95.5 % | 886.5 gpd | 2.2 :1 | Tap Score lab: 776 ppm feed to 35 ppm output without remineralization (95.49%). Flow from a 12 oz fill timed at 9.14 s (0.62 gpm) with 58.3 F feed water. Ratio from a 64 oz draw (29 oz to drain); a 12 oz draw measured 1.5:1. Date is the review update date. |
Specifications
| Model number | WD-G3P800-W |
|---|---|
| Filtration | |
| Output | 800 gallons a day |
| Pure to drain | 3:1 |
| Stages | 10 |
| Remineralization | No |
| NSF/ANSI 58 | Yes |
| Other certifications | NSF/ANSI 42, 53 |
| Replacement filters | $160 a year |
| Build | |
| Tank | Tankless |
| Booster pump | Yes |
| Smart faucet | Yes |
| Warranty | 1 year |
Alternatives in this type
Waterdrop X12
#5 in TanklessFull review
For a large household that wants the fastest flow and lowest waste, and will pay a premium for it.
Amazon $1,099$1,099
Waterdrop G2P600
#7 in TanklessFull review
For a buyer who wants tankless RO at a low price and low running cost and can do without third-party performance certification.
Amazon $299$299
Compare
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