Waterdrop KJ600 Reverse Osmosis System, Instant Hot Water Dispenser, 600 GPD, Reduce PFAS, Tankless, 2:1 Pure to Drain, Under Sink, TDS Reduction, Smart Faucet, Hot and Cold Water Dispenser Faucet

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.

I just finished installing this beast of a unit. Make no mistake, this is a beast of a unit. I don't think I ever grasped how big the base unit was or how tall the dispenser was. The base unit takes up the entire left side underneath my sink.. probably 25% of the space under there. Maybe more since the pipes and lines intrude on so much. I was installing this in place of an old insinkerator filtration system. The hole was a tad bigger than I think this waterdrop unit wanted so screwing in the nut to hold the dispenser in place wasn't quite as easy as I had a hard time getting it as tight as I thought it needed to be. The hole was a little big and there was not a larger spacer/washer to allow for that. Really the only thing I thought they should have had in the system that wasn't there. After suffering through uninstalling the old unit, installing this waterdrop ro system was really quite easy. I thought the hardest part was drilling the drain hole and then shoving the tube in there. That was hard as the 1/4" hole was too small for the tube and I had to enlarge the hole a little at a time until I could shove the drain tube in. After that, it was really easy. Everything is clearly marked and the tubes go into quick connectors very easily. I did have to read through the setup guide after the install to find out that the system wants to flush for 15 minutes after install to get everything through and before any heating can occur. That's fine. I just didn't know this until I read it. The 60 second flush is normal for any filter so that was expected. So far the unit is pretty awesome. After overcoming the shock of how big it was and getting it finally installed, I think my family will very much enjoy using this. There is no taste to the water and the instant hot water feature is so nice. We had that with the insinkerator until a 3rd tank broke. I wasn't about to get another tank. Hated having to deal with those. It's very early but it seems like this will be everything I expected and maybe even better than I expected. I had mentioned the dispenser Sat pretty high... It sits around 10 inches high off the counter. That's fine. I just wasn't expecting it. Hard to gauge in pictures. But the touch controls and the overall function is really easy and nice. The water coming out seems really fresh. I had some cold and it truly came out cold and it was very refreshing.

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.

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.

Was very pleased with this purchase. It’s been almost one year and it is performing perfectly. Hot water is the game changer. Making tea or instant coffee is so quick.