Waterdrop G3P800 Tankless Reverse Osmosis System 800 GPD

Water Filters

Waterdrop WD-G3P800-W

Name: Waterdrop WD-G3P800-W
Brand: Waterdrop

#2 · Best for Maximum PFAS Removal (Reverse Osmosis)

7.4 /10 Our score

Lowest verified price $759.00 Amazon

Our verdict

The strongest choice for known high PFAS or high TDS. For everyone else, it is more system than you need.

Pros

Certified for PFOA/PFOS and lab-tested across 14 PFAS compounds
Also certified to NSF/ANSI 42, 58 and 372
Tankless design
Broad RO coverage including TDS

Cons

Premium price; street prices vary widely, so confirm you're buying the base unit
Needs an outlet, a drain connection and a dedicated faucet
Without the optional remineralization cartridge, Water Filter Guru measured pH dropping from 7.3 to 6.3
1-year warranty

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Last reviewed October 25, 2026

Review

What to know about Waterdrop WD-G3P800-W

A tankless, pump-driven RO system rated at 800 GPD with a 3:1 pure-to-drain ratio and a smart faucet. IAPMO-certified to NSF/ANSI 42, 53 (incl. PFOA/PFOS), 58 and 372. Quality Water Lab's 14-compound PFAS panel found every compound below reporting limits. The best-documented PFAS RO pick for households that want broad removal and can give it an outlet.

Editorial notes

Why it stands out

Why we like it

This is the only pick that is both certified for PFOA/PFOS (IAPMO, NSF/ANSI 53) and independently lab-verified. Quality Water Lab's 14-compound PFAS panel found every compound below reporting limits. It is also certified to NSF/ANSI 42, 58 and 372 (low-lead materials).

Being tankless saves cabinet space compared with older RO designs, and the 3:1 pure-to-drain ratio is among the more water-efficient. Filters run about $145 a year.

What to know

Skip it if you rent, lack an outlet under the sink, or have low-PFAS water that a carbon filter can handle at a fraction of the cost.

Performance

Score breakdown

PFAS reduction evidence

Strength of proof that the system cuts PFAS: a current NSF/ANSI 53/58 PFOA/PFOS or total-PFAS certification (NSF, WQA or IAPMO) and/or independent lab results (TechGearLab/Tap Score, Quality Water Lab). Certified plus lab-verified scores highest; marketing-only claims score lowest.

9.0

NSF 53 PFOA/PFOS certification plus an independent 14-compound panel, though only one panel.

Other contaminant coverage

Certified or lab-verified reduction of lead, chlorine/chloramine, VOCs, pharmaceuticals (NSF 401), microplastics, and for RO, TDS, fluoride, nitrate and arsenic.

9.0

RO plus NSF 58: TDS, fluoride, arsenic and nitrate on top of 42/53.

Value

Upfront price plus annual filter cost per gallon, judged against the protection delivered.

5.0

$849 upfront; about $145 a year in filters.

Installation & cabinet fit

DIY difficulty, whether it needs a drilled faucet hole, a drain saddle or an electrical outlet, renter-friendliness, and under-sink footprint (tank vs tankless).

5.0

Needs an outlet, a drain saddle and a faucet hole.

Flow & daily convenience

Flow rate or production speed, filter-change ease, and filter-life reminders.

8.0

Rated 800 GPD on demand with a filter-life faucet; no measured flow figure.

Health, materials & sustainability

Lead-free component certification (NSF 372), BPA disclosures, wastewater ratio, energy use, effects on pH and minerals, and any media leaching found in lab tests.

7.0

NSF 372, efficient 3:1, but uses power; pH fell to 6.3 without remineralization.

Reliability & support

Leak reports, warranty length, availability of replacement parts and filters.

6.0

1-year warranty; many bundle ASINs.

Specifications

Waterdrop WD-G3P800-W specs

Design

Filter type: Tankless reverse osmosis (with UV LED)

PFAS

PFAS certification (as stated by maker): IAPMO R&T to NSF/ANSI 53 for PFOA/PFOS; also NSF/ANSI 42, 58, 372
Third-party certified for PFAS: Yes

Maintenance

Est. annual filter cost: 145 USD

Sustainability

Pure-to-drain ratio (RO): 3:1

Installation

Needs electrical outlet: Yes
Uses dedicated faucet (drilling may be needed): Yes

Shopping

Compare prices

Prices are checked periodically. Older amounts are labeled with their last verification date.

Disclosure: We may earn a commission when you purchase through links on this page. This does not affect our editorial rankings.

Prices and availability may change. The retailer's price and availability at checkout govern the transaction.

Retailer	Price	Availability
AmazonLowest	$759.00 $999.00	In Stock	View deal

Lowest verified price $759.00

30-day low $759.00

90-day average $864.00

90-day low $759.00

Based on 4 retailer price observations captured during the last 90 days.

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