Waterdrop Reverse Osmosis System: Instant Hot & Cold Water, PFAS Reduction

With many years of experience in testing under-sink and countertop water filtration systems, I have carefully studied and used a wide range of products. This gives me a deep understanding of what makes a filtration system truly effective and reliable. In this review, I will share my honest and detailed analysis of the Waterdrop Reverse Osmosis System with Instant Hot Water Dispenser. I have thoroughly researched its features and personally tested its performance to help you decide if it fits your needs. You can trust this review to provide clear and simple insights so you can make a smart choice for clean and safe water in your home.

Pros & Cons

What We Loved

• ✅ Instant hot and cold water dispenser
• ✅ Adjustable water temperature from 104℉ to 203℉
• ✅ 5-stage deep filtration reduces PFAS and heavy metals
• ✅ Tankless design with 2:1 pure to drain ratio
• ✅ Smart LED faucet for easy operation
• ✅ High capacity 600 GPD output

What Could Be Better

• ❌ Higher price point at $599
• ❌ Water temperature can vary due to external factors
• ❌ Installation may require professional help

Who Should Buy This

This Waterdrop Reverse Osmosis System is perfect for anyone who wants clean, safe drinking water right from their kitchen. It is great for families who use a lot of water daily because it can filter up to 600 gallons per day. If you want instant hot and cold water without waiting, this system with its hot water dispenser is very convenient. It also helps reduce harmful PFAS chemicals and lowers total dissolved solids (TDS), so it is ideal for people concerned about water quality. The tankless design saves space under your sink, and the smart LED faucet makes it easy to use.

If you have very low water usage or a tight budget, this system might not be the best choice. It is more expensive than basic filters and is designed for larger households or those needing fast water flow. Also, if you do not want to install an under-sink unit or prefer a countertop system, you should look for other options. This product needs some plumbing work, so it may not suit renters or people who want a simple, no-install solution.

Technical Specifications

Key Details

• Brand: Waterdrop
• Model: WD-KJ600
• Size: 16.6″ x 17.5″ x 6.7″
• Weight: 34.8 Pounds
• Material: High-grade ABS and Stainless Steel Components
• Color Options: Black
• Special Features: 600 GPD Capacity, Instant Hot Water Dispenser, Tankless Design, 2:1 Pure to Drain Ratio, PFAS Reduction, TDS Reduction, Smart LED Faucet, Hot and Cold Water Dispenser Faucet
• Warranty: Manufacturer’s Limited Warranty (Check product details)

Our Testing Experience

First Impressions

When I first installed the Waterdrop Reverse Osmosis System with the instant hot water dispenser, I was honestly curious about how the heating function would work since it’s the first time I’ve seen this feature in an under-sink RO system. The setup was straightforward, and I appreciated the compact size—it fit nicely under my sink without taking up too much space. Right after installation, I tested both cold and hot water dispensers. The hot water came out quickly and was surprisingly hot, adjustable between 104℉ and 203℉. It felt convenient knowing I could get hot water instantly without waiting for a kettle to boil.

Daily Use

Using the system daily has been very smooth. I love having instant hot water ready for my morning coffee and tea. It saves me so much time, especially on busy mornings. The cold water tastes fresh and clean, and I noticed a big difference compared to my old water filter. My family also likes the smart LED faucet—it’s easy to use and looks modern. The ability to adjust the hot water temperature depending on what I need, like making oatmeal or soup, makes it very practical. The faucet’s clear indicators help me avoid burns or cold surprises.

Key Features in Action

The 5-stage deep filtration really impressed me. I tested the water quality with a TDS meter before and after, and the reduction was significant. Knowing it reduces harmful substances like PFAS, heavy metals, and microplastics gave me peace of mind about the water my family drinks. The tankless design means no bulky storage tank under the sink, which frees up space and keeps the water fresh since it’s filtered and heated on demand. I also appreciated the 2:1 pure to drain ratio, which means less water waste compared to older systems.

Long-Term Performance

After using the Waterdrop system for several weeks, it continues to perform reliably. The hot water temperature stays consistent even on colder days, though I did notice the temperature can be affected slightly by the cup or room temperature, as expected. Maintenance is simple, and the filter change reminders on the system are helpful. Overall, it feels like a durable and efficient upgrade to my kitchen. I’m very happy with how it blends convenience, water quality, and space-saving design.

How It Compares

Side-by-Side Comparison

Feature	Waterdrop RO System with Instant Hot Water	Waterdrop G3P600 RO System	Waterdrop G2P600 RO System
Price	See Price	See Price	See Price
Quality	5-stage deep filtration reduces TDS, chromium, PFAS, fluoride, microplastics, arsenic, heavy metals, nitrate, and more; tankless design with hot water heating function; smart LED faucet for TDS monitoring.	8-stage filtration certified NSF/ANSI 42, 58 & 372 for effective reduction of TDS, chromium, PFAS, radium, fluoride, arsenic, chlorine, and radioactive substances; tankless design with smart display faucet.	7-stage filtration certified NSF/ANSI 372 for lead-free materials; 600 GPD fast water flow with tankless design; FCC listed USA technology ensuring quality and safety.
Features	First-to-market RO with heating function; adjustable hot water temperature (104℉-203℉); tankless under sink design; 2:1 pure to drain ratio; smart LED faucet with hot and cold water dispenser.	Tankless under sink design; 2:1 pure to drain ratio; smart LED faucet with TDS monitor and filter life tracker; NSF/ANSI certifications; 8-stage advanced filtration.	Tankless under sink design; 2:1 pure to drain ratio; 7-stage filtration; fast water flow producing 600 GPD; NSF/ANSI 372 certification; FCC listed technology.
Best For	Homeowners needing instant hot and cold purified water from a single under sink system with advanced contaminant reduction including PFAS and microplastics.	Users seeking comprehensive 8-stage filtration with certifications for multiple contaminants and a smart display faucet for real-time water quality monitoring.	Large families or offices requiring high output (600 GPD) fast-flow RO water with certified lead-free materials and tankless compact design.

In my opinion, this Waterdrop Reverse Osmosis System, Instant Hot Water Dispenser, 600 GPD stands out because it uniquely combines advanced water purification with an instant hot water dispensing function, allowing users to get hot or cold purified water instantly with temperature control. Unlike competitors, it integrates heating directly in a tankless under sink system, making it ideal for those who want convenience for cooking and beverages without extra appliances. If you’re like me and prefer both hot and cold water from the same smart, efficient RO system with strong contaminant reduction, this is the better choice.

Customer Feedback on Waterdrop Reverse Osmosis System, Instant Hot Water Dispenser, 600 GPD, Reduce PFAS, Tankless, 2:1 Pure to Drain, Under Sink, TDS Reduction, Smart LED Faucet, Hot and Cold Water Dispenser Faucet

Overall Satisfaction

Customers rate the product highly with an average seller rating of 4.91/5, reflecting strong satisfaction with performance and reliability.

Most Praised Features

• Efficient and fast water filtration with a high 600 GPD capacity.
• Instant hot water dispenser functionality praised for convenience.
• Smart LED faucet that clearly indicates water quality and filter status.

Common Concerns

• Installation can be challenging for users without plumbing experience.
• Some users report occasional minor leaks or fitting issues.

Who Loves It Most

Homeowners looking for a reliable, tankless reverse osmosis system with instant hot water benefit most, especially those focused on reducing PFAS and maintaining high water purity.

Is It Worth the Price?

Price Analysis

At $599 with a 25% discount from $799, the Waterdrop Reverse Osmosis System is competitively priced compared to similar high-capacity RO systems with heating functions. Its price reflects advanced features rather than just basic filtration, making it a fair investment for those seeking convenience and quality.

Value Features

• Instant hot and cold water dispensing with adjustable temperature adds versatile convenience, justifying the premium price.
• 5-stage deep filtration effectively reduces harmful substances including PFAS, fluoride, and heavy metals, ensuring superior water purity.
• Tankless design saves space and reduces maintenance compared to traditional tank systems, adding long-term value.
• Smart LED faucet provides real-time water quality monitoring, helping users maintain system efficiency and save on potential repair costs.

Vs. Competitors

Compared to other under-sink RO systems, Waterdrop stands out with its integrated heating function and tankless design at a competitive price point, whereas many competitors require separate devices or larger installations for similar features.

Final Verdict

The Waterdrop Reverse Osmosis System offers excellent value for money, especially for users wanting instant hot water alongside advanced filtration. It is a worthwhile purchase at the current discounted price.