VIOMI Reverse Osmosis Systems: 5 Picks Ranked by Specs

Quick picks

Our 5 picks

1 Best overall

VIOMI V6 PRO 600 GPD RO System

Best for: Certified tankless filtration with smart faucet feedback

Filtration Stages

9

Capacity (GPD)

600 GPD

Design

Under sink, tankless

Pure to Drain Ratio

3:1

Certification

NSF/ANSI 42, 53, 58, 372

Filtration Type

Reverse osmosis

View on Amazon: VIOMI V6 PRO 600 GPD RO System Affiliate link

The VIOMI V6 PRO is a tankless under-sink reverse osmosis system with a 600 GPD membrane. It uses a 9-stage filtration process certified to NSF/ANSI 42, 53, 58, and 372 standards. The unit features a 3:1 pure-to-drain ratio and an LED smart faucet showing TDS levels. This model suits you if you need reliable purification for drinking water and ice makers without a storage tank.

Pros

• 600 GPD flow rate fills an 8 oz glass in 9 seconds
• Certified to NSF/ANSI 42, 53, 58, and 372 standards
• 9-stage filtration targets PFAS, lead, and arsenic
• 3:1 pure-to-drain water efficiency ratio
• LED smart faucet displays real-time TDS and filter life

Cons

• 600 GPD capacity is lower than the 800 GPD and 1000 GPD options on this list
• Requires a dedicated electrical outlet and cannot share a garbage disposal circuit
• Standard tubing for refrigerator connection is not included

Good fit if

• You want a tankless system with certified contaminant reduction
• You need water for a refrigerator ice maker
• You prefer real-time TDS monitoring via the faucet display

Skip if

• You require higher flow rates like 800 GPD or 1000 GPD
• You only have one available outlet under the sink
• You want to include refrigerator tubing without buying extra parts

Verdict: The VIOMI V6 PRO 600 GPD RO System offers certified purity and efficient water usage for households prioritizing tankless filtration. It fits buyers who need moderate flow rates and smart faucet feedback rather than maximum speed.

2 Best budget

VIOMI Pure B6W 600 GPD Tankless RO

Best for: Smart monitoring and compact under-sink installation

Filtration Stages

7

Capacity (GPD)

600 GPD

Design

Under sink, tankless

Pure to Drain Ratio

2:1

Certification

NSF/ANSI 42, 53, 58, 372

Filtration Type

Reverse osmosis

View on Amazon: VIOMI Pure B6W 600 GPD Tankless RO Affiliate link

The VIOMI Pure B6W is a 600 GPD tankless under-sink reverse osmosis system. It uses a 7-stage filtration process certified to NSF/ANSI 42, 53, 58, and 372 standards. The unit features a 2:1 pure-to-drain water ratio and includes app control for monitoring filter life and water quality. Its compact tankless design saves space under your sink.

Pros

• 600 GPD flow rate fills a 6 oz glass in 6 seconds
• NSF/ANSI 42, 53, 58, and 372 certifications for safety and filtration
• App control for filter life and water quality monitoring
• Efficient 2:1 pure-to-drain water ratio
• Tankless design is 70% smaller than tank-based systems

Cons

• Requires a dedicated power outlet if a garbage disposer is present
• Standard tubing for refrigerator connection is not included
• Requires two drilled holes for faucet and drain pipe installation

Good fit if

• You need smart monitoring of filter status via an app
• You want a compact tankless system to save under-sink space
• You require NSF/ANSI 372 certification for lead-free materials

Skip if

• You do not have a dedicated electrical outlet under your sink
• You prefer a system with a built-in storage tank
• You want a faucet and tubing included in the box

Verdict: VIOMI Pure B6W 600 GPD Tankless RO is a smart, space-saving choice for users who want app-controlled maintenance and certified filtration without the bulk of a storage tank.

3 Best premium

VIOMI Master M1 1000 GPD Alkaline RO

Best for: High-flow alkaline water needs

Filtration Stages

9

Capacity (GPD)

1000

Design

Under sink, tankless

Pure to Drain Ratio

3:1

Certification

NSF/ANSI 42, 58, 372

Filtration Type

Reverse osmosis, alkaline

View on Amazon: VIOMI Master M1 1000 GPD Alkaline RO Affiliate link

The VIOMI M1 is a tankless under-sink reverse osmosis system with a 1000 GPD membrane. It uses a 9-stage alkaline filtration process to add minerals back into purified water. The unit features a smart faucet with an HD touchscreen and app connectivity. It holds NSF/ANSI 42, 58, and 372 certifications. This system suits households needing high daily output and better-tasting water without a storage tank.

Pros

• 1000 GPD membrane fills an 8oz cup in 3 seconds
• 9-stage filtration adds alkaline minerals for smoother taste
• NSF/ANSI 42, 58, and 372 certified for safety and performance
• Smart faucet includes live TDS readings and filter life status
• 3:1 pure-to-drain ratio saves water compared to traditional RO systems

Cons

• Requires two drilled holes for faucet and drain plus a dedicated electrical outlet
• System weight is 29 pounds, making it heavier than many compact units
• Higher TDS readings are expected due to intentional mineral addition, not reduced filtration

Good fit if

• You need high flow rates for filling large pots or pitchers quickly
• You want alkaline water with a smoother taste than standard RO
• You prefer a tankless design to save under-sink cabinet space

Skip if

• You have limited under-sink electrical outlets or cannot drill additional holes
• You prefer standard RO water with lower TDS and no added minerals
• You need a system that fits in extremely tight spaces under 6 inches wide

Verdict: VIOMI M1 1000 GPD Alkaline RO delivers fast, mineral-enhanced water for busy kitchens that value taste and flow rate over minimalist TDS numbers.

4 Also great

VIOMI Vortex 8 Tankless RO System

Best for: High-flow under-sink purification with certified safety

Filtration Stages

9

Capacity (GPD)

800 GPD

Design

Tankless, under sink

Pure to Drain Ratio

3:1

Certification

NSF/ANSI 42, 53, 372

Filtration Type

Reverse osmosis

View on Amazon: VIOMI Vortex 8 Tankless RO System Affiliate link

The VIOMI Vortex 8 is a tankless reverse osmosis system with an 800 GPD capacity. It uses a 9-stage filtration process with a 0.0001μm membrane to reduce contaminants like lead and PFOS. The unit measures 16.3 inches deep and fits under most sinks. It includes certified filters lasting up to 4 years. This system suits you if you need high flow rates and compact storage for your kitchen.

Pros

• 800 GPD capacity fills a 6oz cup in 5 seconds
• NSF/ANSI 53, 42, and 372 certified for safety
• 9-stage filtration reduces TDS up to 90.35%
• 3:1 pure-to-drain ratio saves water
• Compact tankless design saves 65% of under-sink space

Cons

• Requires two holes for installation: one for the faucet and one for the drain
• Compatible only with the included faucet; cannot connect to fridges or ice-makers
• Heavy at 27.5 pounds, requiring sturdy under-sink support

Good fit if

• You need fast water flow for cooking and drinking
• You have limited under-sink space and want a tankless design
• You want certified protection against lead and microplastics

Skip if

• You want to connect the system to a refrigerator ice-maker
• You only have one pre-drilled hole for the faucet
• You prefer a system with a storage tank for backup water

Verdict: The VIOMI Vortex 8 800GPD Tankless RO delivers high flow and certified purity in a compact footprint. It fits best in kitchens where space is tight and water usage is frequent.

5 Also great

VIOMI V8 Pro 800 GPD RO System

Best for: High-output homes needing real-time TDS data

Filtration Stages

9

Capacity (GPD)

800 GPD

Design

Tankless

Pure to Drain Ratio

3:1

Certification

NSF/ANSI 42, 53, 58, 372

Filtration Type

Reverse osmosis

View on Amazon: VIOMI V8 Pro 800 GPD RO System Affiliate link

The VIOMI V8 Pro is a tankless under-sink reverse osmosis system with an 800 GPD membrane. It offers nine stages of filtration certified to NSF/ANSI 42, 53, 58, and 372 standards. The unit features a 3:1 pure-to-drain ratio and an LED smart faucet showing TDS levels. This model suits households needing high daily output and transparent water quality monitoring without a storage tank.

Pros

• 800 GPD tankless membrane for fast flow
• NSF/ANSI 42, 53, 58, and 372 certified
• 9-stage filtration targets PFAS, lead, and fluoride
• 3:1 pure-to-drain efficiency ratio
• LED faucet displays real-time TDS and filter life

Cons

• Requires a dedicated electrical outlet under the sink
• Cannot share power with a garbage disposer
• Smart app connectivity requires separate setup

Good fit if

• You need high daily purified water output
• You want real-time TDS monitoring via faucet
• You prefer tankless systems for space savings

Skip if

• You lack a dedicated under-sink electrical outlet
• You want to share power with a disposer
• You prefer systems without electronic faucets

Verdict: The VIOMI V8 Pro 800 GPD Tankless RO delivers certified purity and high flow for busy kitchens. It fits homes with dedicated outlets that value real-time water quality data over simple mechanical operation.

Specifications side by side

VIOMI RO Systems Ranked by Specs

The VIOMI lineup prioritizes tankless designs, fitting neatly under most sinks. The VIOMI V6 PRO 600 GPD RO System offers certified purity with smart feedback. It suits buyers needing moderate flow. The VIOMI Pure B6W 600 GPD Tankless RO adds app-controlled maintenance in a compact frame. This option targets users who want smart monitoring without bulk. Both models share a 600 GPD capacity.

For higher output, the VIOMI Master M1 1000 GPD Alkaline RO delivers mineral-enhanced water. It fits busy kitchens valuing taste and flow. The VIOMI Vortex 8 800GPD Tankless RO and VIOMI V8 Pro 800 GPD RO System provide high flow with real-time TDS data. These models suit homes with dedicated outlets. All units install under the sink. Choose based on your daily water volume and need for digital monitoring.

Where VIOMI Fits in Your Kitchen

VIOMI systems range from the compact 600 GPD models to the high-output 1000 GPD Master M1. Most units share a similar slim footprint, measuring roughly 5 inches wide. The Vortex 8 and V8 Pro offer white finishes, while the V6 PRO and Pure B6W focus on utility. You will find tankless designs across the board, with no storage tanks included. The lineup covers flow rates from 600 to 1000 gallons per day. Some models include alkaline remineralization or smart faucet feedback. None of the listed products feature built-in storage tanks or external countertop units. This range suits under-sink installations where space is limited but flow rate matters.

How to choose the right one

1. Check capacity needs

   Gallons per day (GPD) indicates how much purified water the system produces hourly. Higher GPD means faster filling for pots and pitchers. The VIOMI Master M1 1000 GPD Alkaline RO offers high flow for busy kitchens. If you need moderate flow, the 600 GPD models like the VIOMI V6 PRO suffice. Match the GPD rating to your household’s daily water usage to avoid waiting for the tank or system to refill.

2. Verify tankless design

   Tankless systems save under-sink space by eliminating bulky storage tanks. Most VIOMI models, including the Pure B6W and Vortex 8, use this compact design. This layout fits tight cabinets better than traditional setups. However, tankless units rely on flow rate rather than stored volume. Ensure your faucet can handle the continuous flow. The VIOMI V6 PRO provides smart feedback to monitor this process effectively during daily use.

3. Assess physical dimensions

   Measure your under-sink cabinet before purchasing. Width is often the limiting factor. Most VIOMI units are approximately 5 inches wide, fitting standard spaces. The VIOMI Pure B6W is slightly wider at 5.91 inches. Height and length vary, with the Master M1 being the largest at 17.1 inches long. Verify clearances for plumbing and electrical access. The weight also matters for installation stability, ranging from 16.2 to 29 pounds.

4. Consider smart features

   Some models include app control or digital displays for maintenance tracking. The VIOMI Pure B6W offers smart monitoring for filter changes. The V8 Pro provides real-time TDS data for water quality visibility. These features help you track upkeep without guesswork. If you prefer simplicity, the V6 PRO uses a smart faucet for feedback instead of an app. Choose based on your comfort with digital interfaces versus mechanical operation.

5. Evaluate filtration type

   Standard RO removes contaminants, but some models add remineralization. The VIOMI Master M1 1000 GPD includes an alkaline filter to enhance taste and mineral content. This suits buyers who value flavor over minimal TDS numbers. Other models focus on pure certified filtration without added minerals. Decide if you want enhanced taste or neutral purity. The filtration stage determines the final water profile and cost of replacement cartridges over time.

Frequently asked questions

See also

• best VIOMI 600 GPD reverse osmosis systems
• viomi v8 reverse osmosis water vs pure b6w 600gpd under sink
• best VIOMI reverse osmosis systems
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