Ranked #2 of 5Reviewed by Mike Hun·May 20, 2026

Waterdrop G3P800 Tankless

Name: Waterdrop G3P800 Tankless
Price: 549 USD
Availability: InStock
Rating: 4.7 (1 reviews)

4.7

Averaged from + undefined

The verdict

The G3P800 is the tankless RO pick — Waterdrop's on-demand RO with smart faucet at premium price.

Waterdrop G3P800 Tankless

Strengths

+Tankless design — smallest footprint
+800 GPD on-demand production
+Smart faucet with TDS readout
+Lab-proven 3+ year performance

Watch-outs

−Premium price
−Electrical outlet required under sink
−Faucet design takes counter space

How it compares

Tankless. Highest GPD. Premium price.

Who this is for

At a glance: users with limited under-sink space who want on-demand RO.

Why you’d buy the Waterdrop G3P800 Tankless

Tankless design — smallest footprint.
800 GPD on-demand production.
Smart faucet with TDS readout.

Why you’d skip it

Premium price.
Electrical outlet required under sink.
Faucet design takes counter space.

Rating sources

qualitywaterlab

4.7/5

“Waterdrop G3P800 is the best tankless system with the smallest footprint.”

Our 4.7 score is the average of these published ratings. More about methodology.

Frequently asked questions

Is the Waterdrop G3P800 Tankless worth buying?

The G3P800 is the tankless RO pick — Waterdrop's on-demand RO with smart faucet at premium price.

What is the Waterdrop G3P800 Tankless's biggest strength?

Tankless design — smallest footprint

What is the main drawback of the Waterdrop G3P800 Tankless?

Premium price

What sources back the 4.7/5 rating?

Our 4.7/5 rating is the average of scores from 1 independent reverse osmosis systems review — qualitywaterlab. Click any source on the product page to read the original review.

How it compares

See all 5 →

Product	Rating	Price	Best for	Head-to-head
iSpring RCC7AK 6-Stage	4.7	$219	most households wanting RO with mineral-balanced water	vs. Waterdrop G3P800 Tankless →
Waterdrop G3P800 Tankless (this product)	4.7	$549	users with limited under-sink space who want on-demand RO	—
APEC ROES-50	4.6	$249	long-term users who run RO for 10+ years and want lowest yearly cost	vs. Waterdrop G3P800 Tankless →
APEC ROES-PH75	4.7	$231	buyers wanting USA-made alkaline RO	vs. Waterdrop G3P800 Tankless →
Waterdrop D6 Tankless	4.5	$349	value-conscious tankless RO buyers	vs. Waterdrop G3P800 Tankless →

iSpring RCC7AK 6-Stage

#1 · Top Score

iSpring RCC7AK 6-Stage

4.7

Best overall. Alkaline remineralization. Reasonable filter cost.

APEC ROES-50

4.6

Cheapest filter cost. USA-made. No alkaline.

APEC ROES-PH75

4.7

USA-made alkaline. 5-year warranty. Similar to iSpring RCC7AK.

Waterdrop D6 Tankless

4.5

Cheaper tankless. Lower GPD than G3P800. Compact.

Waterdrop G3P800 Tankless

4.7/5· $549

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