Waterdrop KJ600 Instant Hot Reverse Osmosis System
- Reverse osmosis, 5 stage, **NSF/ANSI 372**
- 600 GPD, **0.4 gpm** maximum flow, 2:1 pure to drain
- Hot and cold water dispensing, LED smart display faucet
- Up to 2000 ppm supply TDS, **12 month** filter life
- 17.5 x 6.7 x 16.6 in, corded electric
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
Hot and cold water from one faucet on top of reverse osmosis filtering. Plan on an outlet, cabinet space and a wait for the first heat-up.
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ASIN: B0BKPMMW1HModel: WD-KJ600Category: Water Filtration Systems
Overview
Fitting under the kitchen sink, the WD-KJ600 pushes water through a five-stage reverse osmosis path, then offers it cold or heated at a smart display faucet. Power comes from a cord, and one filter is already installed in the unit.
The hot tap saves boiling a kettle, and the display shows filter status, so one fixture covers drinking water. Power and cabinet room are the demands, and the heater needs time to reach its preset temperature.
Who it's for
A homeowner who makes tea or coffee often and has under-sink space and power gets the full set. A renter, a buyer with a very tight cabinet, or someone who only wants cold filtered water would be better served by a simpler unit.
Pros and cons
- Hot and cold from one faucet
- NSF/ANSI 372 certified
- TDS and PFAS reduction listed
- Pre-installed filter ready to use
- Needs a power outlet
- Heater needs time from cold
- Large body for small cabinets
Performance notes
Reverse osmosis rejects dissolved solids through a membrane, with the stated ratio showing how much water goes to the drain for each part kept. The hot tank has to warm from room temperature to its set point, so the first cup after a cold start takes longer than later ones.
Specifications
| Brand | Waterdrop |
|---|---|
| Model | WD-KJ600 |
| Dimensions & fit | |
| Dimensions | 17.5 x 6.7 x 16.6 in |
| Item Dimensions L X W X H | 17.5"L x 6.7"W x 16.6"H |
| Capacity & performance | |
| Capacity | 600 gallonshigher than 89% of 46 water filtration systems |
| Filter Life Cycle | 12 months |
| Maximum Flow Rate | 0.4 gpm |
| Lowertemperature Range | 104 degrees F |
| Operating Pressure Range | 14.5-87 psi |
| Upper Temperature Rating | 203 °F |
| Power & efficiency | |
| Power Source | Corded electric |
| Construction & materials | |
| Material Type | Reverse osmosis membrane, carbon block, PP cotton |
| Compatibility & installation | |
| Installation Type | Under sink |
| Included components | |
| Included Components | KJ600 RO system with 1 pre-installed filter, smart display faucet, user manual |
| Unit Count | 1 Count |
| Warranty & support | |
| Supported Water Tds Level Maximum Ppm | 2000 ppm |
| Warranty Description | 1 year manufacturer and seller combination |
| Other details | |
| Purification Method | Reverse osmosis, 5 stage |
| External Testing Certification | NSF/ANSI 372 |
| Container Type | Dispenser |
Closest rivals on specs
iSpring RO500AK Alkaline Reverse Osmosis System- Capacity 600 vs 500 gallons (+20%)
- Upper Temperature Rating 203 vs 100 °F (+103%)
iSpring RCC7P-AK Reverse Osmosis System with Pump- Capacity 600 vs 75 gallons (+700%)
- Upper Temperature Rating 203 vs 100 °F (+103%)
iSpring RCC7AK-UV Water Filtration System- Capacity 600 vs 75 gallons (+700%)
- Upper Temperature Rating 203 vs 100 °F (+103%)
Frequently asked questions
Will the Waterdrop WD-KJ600 work with high-TDS tap water?
The listing gives a supported TDS maximum of 2000 ppm, so water above that is outside the stated range. Test your supply before ordering.
Will the WD-KJ600 fit under my sink?
The listed size is 17.5 x 6.7 x 16.6 in. Measure the cabinet and leave room for tubing and the cord.
How long does the hot water take to heat?
The listing says it takes some time to heat water in the tank to the preset temperature, about 15 minutes from room temperature.
Is the WD-KJ600 a pitcher or faucet filter?
No. It is a corded under-sink reverse osmosis system.