I have been drinking filtered water for years and tested the OsmoFresh reverse osmosis systems in daily use – with TDS readings before and after filtration. Here are all five models side by side, including a buying guide and a discount.
Disclosure: partner links are affiliate links. The price stays the same for you – with the discount you even pay less.
The key differences at a glance – tap a model for the full details.
| Model | Connection | Width | Sparkling | Hot water | Ice cubes | UV-C / hygiene | Ideal for |
|---|---|---|---|---|---|---|---|
| Fusion Pro | Tank or mains | 22 cm | up to 95 °C | Triple UV-C | The all-in-one model for sparkling, hot and chilled water | ||
| Fusion Ice | Tank | 30.5 cm | up to 95 °C | up to 90 cubes | No UV-C lamp; ionised air in the ice compartment | Anyone who loves ice cubes and extra-cold still water | |
| Fusion Air | Tank | 19.5 cm | up to 95 °C | Triple UV-C | Small kitchens and homes without a mains connection | ||
| Fusion Stream | Mains | 13.3 cm | up to 95 °C | Triple UV-C | Frequent users with a mains connection who don't want to refill a tank | ||
| Quella Pro | Tank | 20 cm | up to 95 °C | Single UV-C | An affordable entry into reverse osmosis without installation |
Four quick questions – then you know which system makes sense.
Then you need a tank model. Fusion Pro, Fusion Ice and Fusion Air run on a 5-litre tank and only need a power socket.
Only the Fusion Pro carbonates inside the unit – with an internal cartridge or an external CO₂ bottle.
The Fusion Ice makes up to 90 ice cubes and chills water down to roughly 1 °C.
At 19.5 cm the Fusion Air is the slimmest tank unit, and the Fusion Stream at 13.3 cm the slimmest model with a mains connection. The Quella Pro stays a compact countertop unit for beginners.
Simon Kaufmann, CEO of OsmoFresh, explains in the interview what really sets the Fusion series apart and what to look for when choosing the right water filter. Learn more about the scientific foundations of water quality and how longevity experts like Benedikt Keck use OsmoFresh systems.
Premium water dispenser with 7-stage filter, sparkling water, hot water and UV-C disinfection. Temperature range 4-95°C. Ideal for households of 1-10 people.
4°C - 10°C
Capacity: 3 L/h at ≤ 10°C
Medium & Spritzig
Tank: 800 ml usable
bis 95°C
Capacity: 18 L/h at ≥ 90°C
3 UV-C Germ Protection Levels
Lifetime: 20,000 hours
Energy-efficient operation
Automatic refill in fixed water mode
Tank or Fixed Water
5L tank or direct water connection
510 × 220 × 437 mm
Weight: 21.6 kg
Outlet Height with Tray: 26 cm
Outlet Height without Tray: 29.5 cm
220-240 V ~
2400 W / 10 A
18 L/h
≥ 90°C – 2270 W
3 L/h
≤ 10°C – 120 W
1 - 6 bar
5 - 38°C
7-stage RO
Ratio: Tankmodus: 4:1, Leitungsmodus: 1:2
R600a
40 g
Internal & External
Max. 4.5 bar
ROFP
Series: Fusion
1-10 Personen
Ideal for medium to large households
Comprehensive video review before purchase
Through my partner link you get 5% off the Fusion Pro – the discount is applied automatically, no code needed.
The perfect all-in-one still water machine with genuine cooling from 1–95°C, built-in ice cube production and a 2-litre carafe in tank mode. Focused on convenience, cold water and hygiene, including UV and ionisation in the ice compartment.
9 Würfel alle 10 Minuten
Storage: 90 cubes
With UV & ionization
Cold: 1°C - 10°C
Hot: bis 95°C
9 temperature levels
Removable
Continuous dispensing: 1.3L
For maximum flexibility
7-stage RO filter
+ UV disinfection
Purity guaranteed
5L tank (manual fill)
Countertop device
No mains water connection
Programmable volumes
Automatic flushing
LED display
H × W × D: 133 × 385 × 374 mm
Weight: 17.5 kg
Voltage: 220-240 V ~
Frequency: 50 Hz
Nominal power: 2500 W
Important pre-purchase info and answers to the most common questions
Currently 899 € at OsmoFresh
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Particularly compact countertop reverse osmosis system with a width of just 19.5 cm. Integrated tank, hot water function up to 95°C, efficient 2:1 wastewater ratio, and a reduced filter system. Ideal for households of 1-4 people without a fixed water connection.
At only 19.5 cm wide, it's the most compact reverse osmosis system in its class. Perfect for small kitchens and renters.
~30% schneller als Vorgängermodell - approx. 900 ml/min for quick water dispensing.
Improved ≈2:1 wastewater ratio - for 2 liters of pure water, only approx. 1 liter of wastewater.
Only 2 filter cartridges instead of 3 - less material, lower plastic consumption, same performance.
19.5 cm
Width - extremely space-saving
bis 95°C
Adjustable in 7 levels
900
ml/min - ~30% faster
≈2:1
Efficient Ratio
7--stage
With RO Membrane & UV
TÜV
Tested Hygiene
Approx. 900 ml/min vs. ~700 ml/min for previous models - saving you time every day.
For every 2 liters of pure water, only about 1 liter of wastewater is produced - much more efficient than older systems.
Dimensions (W × D × H)
195 × 385 × 374 mm
Weight
7.5 kg (without water)
Tank Capacity
4 Liter
Outlet Height with Tray
23 cm
Outlet Height without Tray
25 cm
UV-C LEDs
3x UV-C LED
Voltage
230 V
Sleep Mode
0.5 W
Standby
0.9 W
Max. Power
2200 W (at 95°C)
Input Water
5–45°C
Only 19.5 cm wide - extremely space-saving
Adjustable hot water up to 95°C
Fast flow rate: approx. 900 ml/min
Efficient 2:1 wastewater ratio
Simplified filter system: 1x 6in1 filter + membrane (separate)
7-stage filtration with RO membrane
Triple UV-C MicrobialResistance® for hygienic water
TÜV-certified hygiene properties (Fusion series)
Integrated tank operation - no fixed water connection needed
Automatic filter status indicator
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Compact countertop reverse osmosis system with direct connection to the water line. At just 13.3 cm wide, it is the narrowest model in the series. No tank refilling necessary, combined with a 3-way UV-C LED hygiene concept and efficient 2:1 wastewater ratio.
With a width of only 13.3 cm, it's the narrowest model in the entire series. Fits into even the smallest kitchenettes.
Direct connection to the water line allows continuous use without manual refilling.
Approx. 900 ml/min - about ~30% schneller als Vorgängermodell.
Optimized ≈2:1 ratio - significantly more efficient than older models.
Best germ reduction in the Fusion series thanks to the triple UV-C LED system.
Only 2 cartridges instead of 3 - less material, same performance.
13.3 cm
Narrowest of all models
Fixed water line
No tank refilling
bis 95°C
Adjustable temperature
900 ml/min
~30% faster
≈2:1
Efficient ratio
3x UV-C LED
MicrobialResistance®
At just 13.3 cm wide, the Fusion Stream is the narrowest of all Osmofresh models. Ideal for tiny kitchenettes and spaces with extreme size constraints.
Best germ reduction in the entire Fusion range. The triple UV-C-LED system effectively protects against bacteria and viruses in your drinking water.
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Former top-of-the-line model from OsmoFresh with 7-stage filtration, six temperature levels, and a raised outlet. Ideal if you want a mobile tank solution without a fixed water connection and are looking for everyday usability.
45 × 20 × 39 cm
Weight: 8,5 kg
Tank device, pipe-connected: no
7
approx. total 1:1
approx. 1,7 l
150, 300, 450, 600, 750, 900 ml
RT 15–22 °C, 45 °C, 55 °C, 80 °C, 90 °C, 100 °C
yes, at the outlet
Height with tray: 23 cm
Height without tray: 25 cm
Max. 2200 W
At 95°C hot water
4 Liter
External water tank
Quella Pro, membrane, filter set
Dispense water via the button. Lower hot water buttons are child-safe, press "Lock" first.
Change the output volume by holding the 80° button for 3 seconds.
Filter indicator on the display.
Recommendation: Pre- and post-filters roughly every 6 months, membrane after 12–24 months or if TDS is permanently ≥ 30.
Clean the external tank with citric acid every 2–3 weeks.
No direct sunlight on the tank. Use wastewater for watering plants, for example.
Comprehensive video review before you buy
Cause: Filter clogged or internal tank hasn't been filled for a long time.
Solution: Change the filters. In case of an E1 error, restart the device and clean if necessary.
Cause: Filter clogged or water pressure too low.
Solution: Change the filters. Check inlet water pressure (should be 1–6 bar).
Cause: New filters haven't been flushed yet or filters are at the end of their lifespan.
Solution: For new filters, discard the first liter. For old filters, replace them.
Cause: Internal tank hasn't been filled for a long time, internal blockage.
Solution: Restart the device. If it happens again, perform cleaning with the OsmoFresh kit.
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My current partner discounts for filtered water – from under-sink osmosis to hydrogen water.
Reverse osmosis made in Germany
Countertop osmosis, no installation
Countertop osmosis with UV and hot water
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