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Home » Reverse Osmosis Systems » Waterdrop K6 Reverse Osmosis Review 

Waterdrop K6 Reverse Osmosis Review 

By: Stephanie Nielsen
Last Updated:

The Waterdrop K6 Reverse Osmosis system is a cutting-edge water filtration solution designed to provide both regular and hot water instantly. 

With its unique features and efficient design, it promises to deliver clean and safe drinking water right from your tap. 

Let’s dive into the details of this top-rated reverse osmosis filter.

Waterdrop K6 Reverse Osmosis Specs and Features

waterdrop k6 filter

9out of 10

Filter Lifespan8.5
System TypeInstant Hot Water Reverse Osmosis
Dimensions18” x 17” x 7”
Filtration Stages5-Stage RO Filtration
Water Temperature Range104℉-203℉
Faucet TypeHigh-End Smart Display Faucet
Flow Capacity600 GPD
Flow Rate0.42 GPM
Pure to Drain Rate2:1
Tank MaterialStainless Steel
Additional Safety FeatureSmart Guard for Safe Use

The Waterdrop K6 Reverse Osmosis system is a first-of-its-kind unit that combines purification and heating into a seamless process. With a 5-stage RO filtration process, it ensures the water is clean and safe for consumption. 

The standout feature is its ability to provide instant hot water within a temperature range of 104℉ to 203℉, which is easily selectable through a high-end smart display faucet. 

The system also boasts a high flow rate of 0.42 GPM, ensuring you have ample water whenever you need it. 

Its stainless steel heating tank and the smart guard feature ensure safe use of the system, making it a reliable choice for modern homes​.

Waterdrop K6 Reverse Osmosis Review 

The K6 isn’t just a water filtration unit; it’s a gateway to enhanced daily living, promising not only safe and tasty water but also the luxury of obtaining hot water at your desired temperature, instantly. 

As we delve into the specifics of its design, filtration efficiency, and other notable features, we aim to provide a comprehensive insight into what makes the Waterdrop K6 a noteworthy investment for both homes and offices.


The design of the Waterdrop K6 RO system is a blend of modern aesthetics and functionality. Its sleek appearance makes it a suitable addition to contemporary kitchen setups. 

waterdrop filter design

The standout feature of the design is the Smart Touch Display Faucet, which not only enhances the aesthetic appeal but also offers a user-friendly interface to monitor and control the system.

waterdrop K6 Touch sceen faucet


The Waterdrop K6 employs a 5-stage filtration system, which includes PP Cotton, Carbon Fiber, RO Membrane, Carbon Block, and an additional PP Cotton stage

This comprehensive filtration process ensures the removal of various contaminants and impurities, providing clean and safe drinking water​​.

Contaminants Removed

The filtration process efficiently tackles a range of contaminants. 

The PP Cotton stage intercepts sediment, rust, and other particulate matter. 

The Carbon Fiber stage adsorbs color, odors, and residual chlorine, improving taste and odor. 

The RO Membrane stage is crucial in reducing Total Dissolved Solids (TDS), chromium, PFAS, fluoride, salts, and more, ensuring water purity at a molecular level. 

The Carbon Block stage further enhances water taste by capturing any remaining contaminants, and the additional PP Cotton Filtration ensures exceptionally clean and clear water​​.

Filter Lifespan/Maintenance

The design of the Waterdrop K6 aims at reducing maintenance requirements by preventing limescale buildup, which is a common issue in conventional water heaters​​.

Waterdrop K6 replacement filter

Water Quality

The system provides high-quality water free from impurities, odors, and contaminants. The instant hot water feature is a notable aspect, with a step-less temperature adjustment range of 104°F to 203°F, ideal for various household tasks like cooking soup, making coffee, tea, and oatmeal​​.

Warranty and Customer Service

The Waterdrop K6 Reverse Osmosis system comes with a 1-year warranty, providing a sense of security and assurance in your investment. 

For any concerns or assistance, reaching out to Waterdrop’s customer service is recommended. They offer support and are ready to address any inquiries or issues you might have regarding the system.


The Waterdrop K6 is designed for a hassle-free installation. There are comprehensive video guides available on the Waterdrop official website that provide step-by-step walkthroughs for installing the product​​.

Waterdrop filter installed under sink

What’s Included

  • Waterdrop K6 system
  • Feed water adapter 3/8″ – 1/2″
  • Inlet water tubing 60”
  • Pure water tubing 60”
  • Hot water tubing 60”
  • Smart faucet
  • Drain water tubing 60”
  • Lock clip x6
  • Drain saddle
  • Teflon tape

Waterdrop K6 Vs. Waterdrop G3 p600 

The Waterdrop K6 and Waterdrop G3 P600 stand as two remarkable choices in the water filtration space, each with its own set of advantages. 

The Waterdrop K6 is an ideal option for those who prefer having instant hot water at their disposal, making it a great companion for cooking and brewing beverages. 

On the other hand, the Waterdrop G3 P600, with its re-mineralization feature, is designed for individuals who not only wish to purify their water but also retain essential minerals that are beneficial for health.

Waterdrop K6
  • Capacity: 600 GPD
  • Filtration Stages: 5 - stages
  • Filter Lifespan: Up to 12 months
  • Flow Rate: 0.42 GPM
  • Warranty: 5 years
  • Remineralization: Cost Extra
  • Water Temp: Ambient - 203℉
Waterdrop G3P600
  • Capacity: 600 GPD
  • Filtration Stages: 5 - stage
  • Filter Lifespan: 6-24 months
  • Flow Rate: 0.42 GPM
  • Warranty: 1 Year
  • Remineralization: Included
  • Water Temp: Ambient

Both the Waterdrop K6 and the Waterdrop G3 P600 systems bring a lot to the table in terms of water purification and additional features. Your choice between the two would largely depend on your individual or household needs. 

If having instant hot water is a priority, the Waterdrop K6 would be the way to go. However, if you’re more inclined towards not only purifying but also re-mineralizing your water, the Waterdrop G3 P600 would be a more suitable choice. 

Both systems come with a 1-year warranty which adds a layer of trust and assurance in the brand.

What We Like About the Waterdrop K6 (Pros)

  • Instant Hot Water: The Waterdrop K6’s ability to provide instant hot water ranging from 104℉ to 203℉ is a game-changer for various kitchen tasks. Whether it’s making coffee or speeding up cooking processes, having hot water on demand is incredibly convenient.
  • 5-Stage Filtration: The comprehensive 5-stage filtration process effectively removes a wide range of contaminants ensuring safe and clean drinking water. This extensive filtration is crucial for maintaining water quality.
  • High Flow Rate: The high flow rate of the Waterdrop K6 ensures you have ample water whenever you need it. This is particularly useful in households or settings where water is frequently needed.
  • Smart Display Faucet: The high-end smart display faucet is not only aesthetically pleasing but also user-friendly. It provides an intuitive interface to control and monitor the system, adding a touch of modernity to your kitchen.
  • Stainless Steel Tank: The stainless steel heating tank is durable and ensures the safe heating of water. It’s a reliable choice for long-term use.
  • Space-Saving Design: The compact design of the Waterdrop K6 makes it an excellent choice for modern homes with limited space under the sink. It’s sleek, and doesn’t compromise on performance despite its size.
  • Easy Installation: The system is designed for a hassle-free installation process. Comprehensive video guides are available on the Waterdrop official website, making it easier for individuals to install the unit on their own.

What We Dislike About the Waterdrop K6 (Cons)

  • No Re-Mineralization: Unlike some other models like the Waterdrop G3 P600, the K6 doesn’t have a re-mineralization feature. This means it doesn’t add beneficial minerals back into the water which some users might prefer for taste and health benefits.
  • Limited Water Temperature Options: While the instant hot water feature is convenient, the lack of an option for chilled or ambient water might not cater to all preferences, especially during warmer months.
  • Single Faucet Functionality: The system comes with a single faucet, which might not be convenient for users who prefer separate faucets for hot and cold water.

Also Check Out: Waterdrop Vs. AquaTru

Final Thoughts

The Waterdrop K6 Reverse Osmosis system emerges as a robust contender in the realm of water purification systems, encapsulating a blend of modern design, functionality, and convenience. 

Its signature feature of providing instant hot water sets it apart, catering to a seamless kitchen experience. However, the absence of a re-mineralization feature and the lack of information on filter lifespan could be potential deal-breakers for some individuals. 

When compared with the Waterdrop G3 P600, the choice between the two boils down to individual preferences and specific needs. 

While the G3 P600 thrives in re-mineralizing the purified water, the K6 excels in delivering hot water instantaneously. 

Investing in either of the systems is a step towards not only accessing cleaner and safer water but also enhancing the overall water consumption experience. 

Whether it’s the K6 or the G3 P600, Waterdrop’s innovation in water purification technology is evident, promising a significant upgrade to your daily water usage routine.

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Stephanie Nielsen
Stephanie worked as a department supervisor of kitchen, bath, and appliances at Home Depot, and water filters were part of the inventory she was responsible for assisting clients with so she learned the ins and outs of matching the right filtration device to homeowner’s needs. She also worked closely with Culligan water to educate customers about whole-home water treatment and softener systems.

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