Waterdrop KJ600 Instant Hot Reverse Osmosis System, 600 GPD, Tankless RO

I was and still am a most satisfied customer. The system worked beautifully for a year when it indicated that it needed to change the filter. I changed the filter, and flushing and priming happened automatically all on its own. This was wonderful. Automated after-filter change routine that worked!! The system worked for a few days, then something happened: The system all of a sudden behaved as if it were unplugged; there are no indicator lights on the faucet or the main unit. While it still dispenses water, it only dispenses cold water regardless of whether the cold or hot water button is pressed. During dispensing, the cold water button on the faucet blinks, and the blue KJF filter light on the main unit illuminates momentarily. So naturally, I emailed the customer support. They were very polite, however, likely because they were trained that way. Their instructions and diagnosis of the technical problem were the worst I have ever experienced. After a long email thread, they started repeating the instructions and diagnosis. Other ather words, they did not review previous communication. Utterly frustrating, meaningless, and a waste of time. If the support team had bothered to ask technicians, the support would have been quick and meaningful. I started giving them a summary of past communications to break the endless cycle of the same opinion and diagnosis. Finally, they decided to turn this over to a technician after over a week-long exchange and over 10 emails later. A day later, they emailed me that the technician said the system was going through a "rinsing cycle", based on the video I sent them at the beginning of all this. And instructed me to let the cold water run, and after the cycle is complete, the heater would turn on. They did not say how long it would take to complete the cycle or whether it would stop dispensing water automatically. I had to ask Gemini AI, and it said the cycle would be 5 to 10 minutes and it would stop automatically. So, with the customer's/technician's support and AI help, I was able to complete the "rinsing cycle," and the heater came back online. I did not expect it needed a "rinsing cycle", which is essentially flushing and priming, after successful flushing and resetting. I do love this product and what it does for me. I love the automatic routines after a filter change. This is a well-designed and extremely convenient product for me. But contacting customer support is not something I wish to repeat. I do not know how many stars to give to this product: 5 stars for the system performance and less than 1 star for their customer support. I would ask AI first next time the system fails instead of contacting the support team.

Ease of installation, everything is labeled, colored and easy to do. The only down side was that it is large, and in order for me to fit it under the sink, I had to remove the garbage disposal first. Not difficult, just one additional step. One item that is a little confusing is the initial turn on step and like most filters, you have to let it run for a certain amount of time, or certain amount of water. The directions made it seem that it would do this on its own, once the startup was initiated. In order to fill the filter though, you still have to turn on the cold water and let it run for a while in order to flush and fill the filter. Then it will allow you to set the hot water temperature. It works great, water is hot as you need it, and it tastes great, or should I say, it doesn’t taste like anything.

The Waterdrop Reverse Osmosis System is an outstanding upgrade for any kitchen, delivering incredibly clean, great‑tasting water with impressive TDS reduction. The 600 GPD flow rate ensures fast, steady water output, and the tankless design saves a ton of space under the sink. I love the instant hot‑water feature—it’s perfect for tea, cooking, and quick meals. The smart LED faucet looks modern and makes it easy to monitor filter status. The 2:1 pure‑to‑drain ratio is far more efficient than traditional RO systems. It also reduces PFAS, which gives real peace of mind about water safety. Overall, a premium system that feels worth every penny.

Clean drinking water with a tap of your finger. The ability to get hot or cold filtered water is so handy. The system does take up a rather large footprint under the sink, so make sure you have enough space. Installation was straight forward with clear and easy to follow steps. If you already have a hole drilled into your countertop, it is an easy DIY install. Taking off a star for how loud the system is when running cycles even when not in active use. The thing will be running and filling an inner tank but makes quite a bit of noise. That said, you get used to it and the easy access to water and clean design still wins. I would still buy this again.

I've owned the Waterdrop K6/KJ600 under sink reverse osmosis system with instant hot water for about two years, and it has been one of the best upgrades I've made to my kitchen. The water tastes exceptionally clean, having instant hot water for tea, coffee, oatmeal, and cooking is incredibly convenient. The system has been reliable, and the filter replacement process is quick and straightforward. After nearly two years of ownership, I experienced an issue and contacted Waterdrop Customer Service. That's where Becky C made all the difference. Becky was responsive, professional, and genuinely committed to helping me. She communicated clearly throughout the entire process, kept me updated, and worked quickly to resolve my issue. It's rare to find customer service that is this attentive and easy to work with, and I truly appreciated her dedication. Any product can experience an issue over time. What really matters is how a company stands behind its products, and my experience with Waterdrop gave me confidence that they do. Thank you, Becky, for providing outstanding customer service and making what could have been a frustrating situation into a positive experience. Between the quality of the K6 system and the excellent support I received, I would confidently recommend Waterdrop to anyone looking for a premium under sink reverse osmosis system with instant hot water.

Never tested quality of water, just trusted TDS display. Tasted and smelled ok. Instant hot is the problem. Was always on at random times with loud churning noises. At one year the lock button no longer functioned. Then another 10 months (now) it made super noisy nonstop 80 db freight train sound until I unplugged it to make it stop because all other buttons didn’t function. I cycled it on again but kept getting E05 error and no hot water. Worse of all as E05 error tells you to contact Waterdrop right away ( 24/7 service my A…) there is no answer. Called next day got some dumbo who made me do the whole cycle all over again though I said I already had multiple times. Guy kept talking over me like a robot to get thtough his script and ignored me. Said if it didn’t work after 15 minutes to call back to ‘escalate’ it. Of course after 15 minutes it didn’t work. Left hanging on phone cue after 2 hrs (‘you are 1st in line’). No answer. Friend tried calling while I was 1st for over 1 hr got fast busy signal repeatedly. So much for customer service. To sum it up DO NOT BUY!! Get whole house RO and standard instant hot tap instead. This product is nothing more than a cheap ‘Made in China’ piece of trash. So is the ‘ customer service’.

I've been seeing articles about microplastics in our drinking water supply for several years, and then I saw a paper about them being able to cross the blood brain barrier. No idea if that passed peer review, but if it was correct it seemed unlikely that micro-plastics in the brain would give me super powers, and a more likely speculation that longitudinal studies will show something like a dementia risk. So... RO filter. I've no affiliation with the company beyond appreciating their product enough to write a very rare Amazon review. There is very limited counter space available, so I was looking for an under-counter unit. The kettle was also starting to fail so I went looking to see if there was a filter that integrated a hot water option to reclaim additional counter space. This was the only unit on the market at the time. Did a bunch of additional background reading around standards specifications and came away content that it'd be fit for purpose. Although if you want to hook it up in-front of a fridge icemaker or similar this isn't the unit for you. This unit isn't cheap and I did look at a water fountain with subscription as an alternative. The subscription looked very slightly more expensive yearly than filter replacement, but without the substantial up front cost. However storage space is a premium for me and I cannot afford the space for the cache of water a fountain requires, nor the footprint of the fountain. I called around looking for plumber quotes for just the install if I supplied the unit, and they came back in the $1k+ range. Okay, how hard can this be for self-install? (FYI I did look at drilling a new hole into the stainless steel sink, but luckily could avoid it through purchase of a different faucet. If you go down the drilling path, look at tips to avoid "work hardening". Plumbers can be worth the cost because they know this stuff without expensive and difficult to correct "learning experiences".) Ordered it, it arrived, seems I needed to order more stuff. This was entirely on me, but as a service to amateur self-installers there could be a "things to look for " section in the product doc. I'll put links to the additional purchases. To avoid having to cut and weld copper, I replaced the existing faucet with one that had flexible braided hose instead of rigid metal. To avoid back siphoning and comply with local code I switched the existing air gap for the dishwasher with a dual intake one. This sits between the dishwasher/ROfilter and the waste line. Because I was moving from a faucet with a wide base to a small base, exposing one of the sink's pre-cut holes, I filled that with an under sink dish soap dispenser. Final enhancement was a remineralization filter on the cold output as, if this is a primary source of hydration, you don't want your drinking water causing necessary dissolved minerals to osmose out of your cells. The unit was easy to install... although I had to return the first one due to it failing to complete initial self-checks. The swap was incredibly smooth - their support had a replacement unit on the way the same evening after I described symptoms, the checks I'd done for free-flow of water, and sent photo/video. IIRC the replacement unit arrived a day later, I slapped a return label on the original and was done. I'm noting this because good support of products is a massive positive differentiator for me when they're sealed systems. Install: The install was simple. The hoses are all push fit and, so long as you apply the little retainer clips, no leaking at all after installation. I did diverge from their install instructions regarding the waste water line - that was a push fit into the air gap instead of drilling a small hole into the sink waste line. Use: The water comes out _almost_ boiling. You do have to run it for a second or two to flush the cool water in the pipes if you want it for tea, but if you do it is definitely sufficiently hot for tea and coffee. The temperature read-out on the faucet tells you when you're good to go. In terms of volume, I've not run out when pulling 3-4 cups at a time for cooking rice/pasta/etc. In fact I've not run out of hot water when I've needed it, but your usage patterns will dictate whether this is a viable total kettle replacement for you. When first using it I did wish for more tactile feedback on the top of the filter faucet - I'm watching a stream of boiling water near my fingers like a hawk, so looking away to find the "off" button on a completely smooth touch surface was... uncomfortable. After a short adjustment I'm now able to turn it off without looking away from the water so it's not a lasting issue, just a learning curve. There is noise when it's in operation, but it's pretty muted just by thin, un-insulated wood panel cupboard doors. My sleeping area is a loft above the kitchen space, and I'm a light sleeper, but this is not enough to disturb me. I was adjusting the temperature of the hot water down before bed, then up again before morning routine to reduce energy expenditure, but have given up on that. This shares a power meter with the dishwasher so I don't have isolated reading. Looking at it, it's currently drawing 2.2w. It's 06:18, I've had 1 coffee, and it's drawn 0.14kWh total since midnight. I've never bothered to adjust the temperature from maximum after initial experimentation. This isn't a kettle, and if you adjust the setting it does take time for the temperature to ramp up, which is not suited to my primary use of hot drinks. I want waster very hot and without delay. I've no idea how long it takes the temp to drop, but given power draw I have to assume decent insulation and therefore quite some time. I do wish I could set the temperature display to Celsius, but it's sold in the US so that's a very minor critique. I would have liked some average power consumption figures in their product docs for X liters of cold, Y of hot per day but after observation power consumption is low enough for me to ignore. The only reason I've put this as room for improvement is that for the very energy conscious this would benefit from a small zigbee controller between faucet and filter that allowed adjustment of temperature on a schedule. I agree with their design choice _not_ to clutter the filter faucet with controls for such a setting. I've not had this for long enough yet to be able to comment on filter life/replacement. Not affiliated with any of these sellers either. airgap: https://www.amazon.com/gp/product/B092RFBTXK/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&th=1 faucet: https://www.amazon.com/gp/product/B092VQTNW1/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 soap: https://www.amazon.com/gp/product/B018WUPCRA/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 additional push-fit host: https://www.amazon.com/gp/product/B08619RF3G/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 remineralization: https://www.amazon.com/gp/product/B08DXYL81C/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I purchased this product over two years ago to filter tap water to purify drinking water and reduce water hardness. My tap water has over 200ppm, and I was shocked to find that the GE refrigerator water filter was only able to reduce that to 160ppm. I had hard mineral buildup on my automatic coffee maker, humidifier, hot water dispenser, etc. After searching for a RO water filter system, I came across this Waterdrop RO system with high end filtration that met the NSF/ANSI 372 certification, is compact, provides great water flow, provides heated water on demand (for tea/cooking/etc), and has extremely easy to change water filter. After installation and startup, the water hardness was reduced to 5ppm! I have been using for over two years now and hard mineral issues are no longer a problem for my various appliances. For a family of four, after one year of extensive water use (drinking, appliances washing fruits/vegetables, etc), this RO system still filtered water to a hardness of 30ppm. I didn't expect it to work so well. There was a con - after a week away, I found the water heater no longer worked, and I could not restart it following the manual instructions. However, I contacted customer service who surprisingly picked up the telephone call after hours on a weekend. They walked me through to resetting the system and ensured it was operational again. They followed up with me on a daily basis for a few days via email to ensure the system continued to work. Another con (small con) is the touch sensor on the dispenser - if your fingers are wet, sometimes the touch does not register. An improvement would be to have mechanical buttons. In sum, I am very happy with the quality, functionality, longevity, and customer service for this system. If you can install this or find someone to install, I highly recommend this RO system.

Such a great solution. It is really as described. Good water flow, instant hot water. Regarding the noise it is not that much and you can hear the sound for seconds. The only disadvantage is if you want to change the temperature for the hot water you need to wait until the system adjust, it will take couple of minutes.

Ho installato il depuratore ma non mi da indicazioni della temperatura, TDS e non parte la scaldiglia, sapreste aiutarmi a capire il problema?

I’m really impressed with the Waterdrop Reverse Osmosis System! I use it to make my baby’s formula, and it has saved so much time. Having instant hot and cold water on hand is super convenient, and I feel safe knowing the water is clean and filtered. It was super easy to install and works great. The instant hot water dispenser is a huge bonus, perfect for coffee or tea. The cold water is always crisp and refreshing, and the smart LED faucet makes it easy to check the water quality. The smart LED faucet is a nice touch too. Definitely recommend it for anyone looking for a reliable water filtration system!

Ho deciso di acquistare il Waterdrop Sistema di Erogazione Istantanea di Acqua Calda a Osmosi Inversa WD-KJ600 (600 GPD, senza serbatoio, rapporto 2:1) dopo una precedente esperienza non particolarmente positiva con un altro prodotto dello stesso brand, il Waterdrop G2P600. Proprio questa esperienza iniziale è stata determinante nella scelta: speravo che un modello più costoso, più evoluto e con funzionalità aggiuntive potesse risolvere le criticità riscontrate in precedenza. Purtroppo, le aspettative non sono state soddisfatte. Parto dal contesto: con il G2P600 mi ero trovato male principalmente per due motivi. Il primo, molto serio, riguarda la reperibilità dei filtri di ricambio. Dopo circa sei mesi dall’acquisto, i filtri non erano più disponibili su Amazon e potevano essere acquistati solo tramite un sito estero non italiano, con costi di spedizione elevati e tempi lunghi. Il secondo problema era la durata reale dei filtri, che sulla carta avrebbero dovuto garantire almeno 12 mesi di utilizzo, ma che nella pratica si sono esauriti in circa 6 mesi. Nonostante tutto, però, quel modello base aveva un punto di forza importante: la qualità dell’acqua filtrata. All’inizio riuscivo ad ottenere un valore di TDS intorno a 21, un risultato eccellente per un sistema domestico a osmosi inversa. Proprio per evitare di ripetere gli stessi errori, ho deciso di investire di più e acquistare il WD-KJ600, convinto che un sistema di fascia superiore, con erogazione istantanea di acqua calda, rubinetto LED intelligente e una portata elevata da 600 GPD, fosse più affidabile anche sul fronte della filtrazione. Dal punto di vista costruttivo ed estetico, nulla da dire: il sistema è moderno, compatto, ben progettato per essere installato sotto il lavello e l’assenza del serbatoio è sicuramente un vantaggio in termini di ingombri e igiene. Anche il rubinetto LED è intuitivo e ben realizzato. Il problema principale, però, resta ancora una volta la qualità effettiva della depurazione. Fin dai primi utilizzi ho notato valori di TDS costantemente superiori ai 300, un dato decisamente deludente per un sistema a osmosi inversa di questo livello e prezzo. Ho effettuato più misurazioni, in diversi momenti, convinto inizialmente potesse trattarsi di un assestamento iniziale dei filtri, ma la situazione non è mai migliorata in modo significativo. Questo è particolarmente frustrante se confrontato con il modello base, che almeno nelle prime fasi garantiva un’acqua con TDS estremamente basso. A rendere il tutto ancora più scoraggiante è il fatto che anche su questo modello si ripresentano le stesse incertezze legate ai filtri: costi elevati, disponibilità non sempre chiara e, soprattutto, una resa che non giustifica né il prezzo dell’impianto né quello dei ricambi. Quando si acquista un sistema di questo tipo, l’obiettivo principale dovrebbe essere la qualità dell’acqua, e purtroppo è proprio su questo aspetto che il WD-KJ600 fallisce. In conclusione, nonostante le ottime specifiche sulla carta, le funzioni avanzate e un design curato, questo sistema non ha mantenuto le promesse. Spendere di più non ha significato ottenere un’acqua migliore, anzi, sotto il profilo della depurazione pura, l’esperienza è stata addirittura peggiore rispetto al modello base. Per chi valuta un impianto Waterdrop, consiglio di riflettere molto bene soprattutto sulla gestione dei filtri nel tempo e sulla qualità reale dell’acqua filtrata, perché almeno nel mio caso il rapporto qualità-prezzo risulta decisamente deludente.

We got this about three weeks ago. The install was super easy. It is just so nice and convenient to have instant hot water. We drink a lot of tea at home. So this has become our best friend very quickly! Not to mention the customer service is just so good. Very responsive, supper supportive. It is so good that we ordered a second one for my in-laws. They also love it! One thing I have to say is to make sure you check the size for your drain pipe. Waterdrop provides a 1 1/2” drain saddle.