JIMMY R9 Pro: What's new?
The basic principle remains largely unchanged. It is still a countertop water purifier with a reverse osmosis filter, integrated pure water tank, and instant hot water function without a fixed water connection. The difference lies in the active cooling, which for the first time provides true cold water at around 10 to 15 °C at the touch of a button.
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Design and workmanship
Visually, the JIMMY R9 Pro closely resembles the familiar R9. The unit remains a compact countertop water dispenser with clean lines, a large touchscreen display, and a side-mounted water tank. However, the integrated cooling system slightly increases the unit's depth and weight, which should be considered when planning your kitchen countertop placement.
The workmanship continues to leave a high-quality impression. The housing is made of food-grade plastic, and the two included 1-liter pitchers made of Tritan appear sturdy and suitable for everyday use. The modular tank design remains practical. The 5,5-liter raw water tank can be removed from the side and conveniently filled at the tap without having to move the entire unit.
No permanent installation is necessary. A power connection is sufficient; the water purification process then starts automatically as soon as the pure water jug is inserted.
Filtration system and water treatment
The R9 Pro's filter system adopts the technology of the previously tested R9 almost unchanged. JIMMY continues to rely on a multi-stage reverse osmosis system, in which several purification stages are combined in three cartridges.
A composite filter first removes sediments such as rust or sand, as well as chlorine and odors. The RO membrane, with a pore size of 0,0001 microns, then filters out dissolved substances such as heavy metals, nitrates, PFAS, bacteria, and limescale. Finally, an activated carbon post-filter stabilizes the taste and slightly remineralizes the water.
As with the R9, the treated water is additionally kept sterile in the purified water tank using UV-C light to prevent recontamination. According to the display, the reverse osmosis filtration significantly reduces the TDS value of the water, which is noticeable in everyday use primarily as a noticeably softer and more neutral taste.
However, long-term testing of the R9 revealed that the transparent Tritan pitchers can become slightly milky over time due to the continuous UV lighting. This is purely a cosmetic change to the material, which affects neither the stability nor the water quality, but remains visible in everyday use.
The R9 Pro operates identically to the R9. After filling the raw water tank, the unit automatically begins filtration and keeps the inserted purified water pitcher full. Manual activation is not required. When water is drawn, the purification process restarts in the background. Water is drawn via the central touchscreen display.
Temperature and dispensing volume can be preset; then, with the touch of a button, the device precisely dispenses the desired amount into the cup or bottle. Fixed volume settings between 120 and 500 milliliters are available. The integrated flow heater delivers hot water within seconds, making a traditional kettle practically unnecessary.
The new cooling function in detail
Inside, a separate cold water circuit actively tempers the already filtered water. Unlike simple water dispensers, the water isn't cooled only when dispensed, but is constantly kept at the target temperature in a small internal tank. Technically, JIMMY uses a thermoelectric cooling system with a fan and circulation pump, eliminating the need for a compressor.
The cooling system is disabled by default and must be manually activated upon first startup. The system then requires approximately 15 to 20 minutes to initially provide cold water. After this initial activation, the cooling system operates automatically in the background, maintaining a constant temperature.
A typical characteristic of Peltier cooling systems is that they are designed for temperature maintenance rather than rapid cooling. It takes approximately 15 to 20 minutes for the water to cool to 10°C. If a large amount of cold water is drawn off in quick succession, the device needs a short time to cool back down to the target temperature. However, it operates relatively quietly and with minimal vibration.
The cooling system is deactivated by default and must be manually activated by pressing and holding the cooling button. A slight background hum is audible on the R9 Pro due to the fan and cooling module, similar to a very quiet mini-fridge.
TDS measurement and water quality
Like the R9, the R9 Pro also features integrated TDS sensors at the inlet and behind the RO membrane. The display shows at any time how much the dissolved solids in the tap water are being reduced. TDS stands for Total Dissolved Solids and describes the total amount of dissolved minerals and salts in the water.
The test again showed that the reverse osmosis membrane significantly reduces the TDS value. Depending on the regional water hardness, the measured value typically drops by over 90 percent after filtration. The result is noticeably softer, almost neutral drinking water without a chalky aftertaste.
As with its predecessor, the reading is taken before the remineralization stage, which is why external measuring devices usually show slightly higher values in the finished drinking water. Nevertheless, the water doesn't taste bland, but rather balanced and clean.
Wastewater ratio and tank management
Like any reverse osmosis system, the R9 Pro produces a concentrate containing the filtered-out substances. The ratio of purified water to concentrate remains at approximately 3:1, which is a good level for countertop units. Unlike permanently installed reverse osmosis systems, however, the R9 Pro does not discharge this water down the drain. Instead, the concentrate is returned to the raw water tank.
With each filtration cycle, the concentration of dissolved substances increases until a defined limit is reached. Only then does the device prompt the user via a message on the display to empty the tank and refill it with fresh tap water. Depending on the water hardness and usage, the raw water tank needs to be refilled more or less frequently. In our tests, this point was usually reached after three to four filled pitchers.
Running costs
The main ongoing costs for the R9 Pro also arise from the filters. The three-stage system still consists of a composite filter, an activated carbon post-filter, and an RO membrane, whose replacement intervals remain unchanged. The two pre- and post-filters are designed for a service life of approximately twelve months, while the RO membrane typically only needs replacing after about two years.
The actual replacement interval depends heavily on water quality and usage intensity, but is reliably monitored via the filter indicator on the display. According to the manufacturer, the recommended retail price for the filters is €29,99 for the composite filter (Link) and the activated carbon post-filter (Link) as well as €49,99 for the RO membrane (Link).
If you calculate the filter costs over a year, the running costs amount to approximately 85 euros annually, or 75 euros with the current offer. This places the R9 Pro in a price range roughly between discount bottled water and premium branded water, but without the hassle of lugging crates or generating plastic waste.
Additional costs include electricity for filtration, hot water preparation, and cooling. While the instant heating system only draws high power briefly, the cooling system operates continuously in the background. Therefore, realistic annual electricity costs of approximately 35 to 50 euros can be expected in continuous operation.
