Compare Reverse Osmosis Systems

The top reverse osmosis systems side-by-side — facts only. Independently ranked, never pay-to-rank.

Waterdrop G3P800 Tankless RO (800 GPD)

GE GXRV40TBN 5-Stage Reverse Osmosis

A.O. Smith AO-US-RO-4000 4-Stage RO

APEC RO-90 Ultimate 5-Stage RO (90 GPD)

Aquasana OptimH2O Reverse Osmosis + Claryum

Aquasana SmartFlow Reverse Osmosis

Home Master TMAFC-ERP Artesian Full Contact RO

Brand

Waterdrop

GE Appliances (Haier)

A.O. Smith

APEC Water Systems

Aquasana

Home Master (Perfect Water)

Price range

$540–$999

$250–$350

$200–$300

$220–$280

$350–$450

$400–$550

$480–$560

NSF certs

NSF/ANSI 42, NSF/ANSI 53, NSF/ANSI 58, NSF/ANSI 372

NSF/ANSI 42, NSF/ANSI 53, NSF/ANSI 58, NSF/ANSI 401, NSF/ANSI P473, NSF/ANSI P231

NSF/ANSI 42, NSF/ANSI 53, NSF/ANSI 58, NSF/ANSI 401, NSF/ANSI P473

NSF/ANSI 58, NSF/ANSI 372, WQA Gold Seal

NSF/ANSI 42, NSF/ANSI 53, NSF/ANSI 58, NSF/ANSI 401, NSF/ANSI P473

NSF/ANSI 42, NSF/ANSI 53, NSF/ANSI 58, NSF/ANSI 401, CSA B483.1

NSF/ANSI (component-certified)

Rating

4.5 (4,000)

4.4 (1,800)

4.4 (2,000)

4.6 (8,000)

4.3 (1,500)

4.2 (600)

4.6 (2,500)

Warranty

1yr limited

2yr (extended w/ registration)

1yr limited

5yr limited (parts)

Rank score

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