Bosch Fontus 18V-6Compact cordless pressure washer in the test

Stefan Frey

 · 29.01.2025

Bosch recently launched a particularly compact cordless cleaner onto the market. We have already been able to test the mini washing machine
Photo: Georg Grieshaber
Do you want to remove mud from your bike on the road or immediately after a tour? Thanks to mobile cleaning devices, this is no longer a problem. We have tested four cordless pressure washers and tell you which one cleans best. This time: the Bosch Fontus 18V-6.

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Bosch Fontus? Does that ring a bell? Exactly, a few years ago the DIY specialist (the green one) launched a mobile low-pressure cleaner on the market. The Fontus in question is still available today and has a 15-litre tank, water and power connection and was similar in design to a compact steam cleaner - but the large appliance was not really mobile. The new cordless Fontus 18V-6 is now much lighter and more compact. And as you can guess from the name abbreviation, the smaller size is primarily at the expense of the tank volume.

The new Bosch Fontus is barely bigger than a well-stocked briefcasePhoto: Georg GrieshaberThe new Bosch Fontus is barely bigger than a well-stocked briefcase

Bosch Fontus 18V-6 Equipment

The tank of the small Bosch Fontus cordless pressure washer holds just 6 litres, but the appliance is hardly bigger than a well-filled briefcase. The 2.7 metre long hose can be wrapped around the housing for transport. The large handle makes it easy to transport the fully filled Fontus, which weighs just under eleven kilos, to the washing area. The equipment is otherwise straightforward. In addition to the battery and charger, only the claw brush is included in the scope of delivery. The nozzle offers four different spray patterns and fights dirt on the bike with two to 20 bar.

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Four spray modes can be set on the compact spray head. Not all are suitable for bikesPhoto: Georg GrieshaberFour spray modes can be set on the compact spray head. Not all are suitable for bikes

Handling

Hardly any other appliance is as easy to use as the Bosch Fontus. Fill with water, insert the battery and off you go. The option of filling the device and then taking it on tour in the car is great. Unlike the Muc-Off or Aqua2Go, the tank can be closed with a screw cap. This conceals a removable filter. Refilling in a stream or lake is therefore also no problem.

The tank holds six litres. Thanks to the filter, you can also draw it from the streamPhoto: Georg GrieshaberThe tank holds six litres. Thanks to the filter, you can also draw it from the stream


Small tank volume

This becomes necessary sooner than expected. Once the bike is properly soiled, the 6-litre tank is quickly emptied. Ok, it's enough for one bike, but not enough for more. The 2.7 metre hose could be a little longer, but if necessary you can walk around the bike with the Fontus in your hand. The small gun sits comfortably in the hand and the power mode also builds up sufficient pressure for coarse dirt. If you switch to Eco mode, however, the pressure is at most sufficient to rinse the leftovers off your plate while camping.

Versatile rechargeable battery

We were particularly impressed by the battery performance of the Bosch. The Fontus buzzed for a full 25 minutes on a high setting. However, it should be added that Bosch sent a larger battery for testing. The cleaner is supplied with a 2000 rechargeable battery as standard. However, if you already have a device from the "Power for all Alliance", which also includes brands such as Gardena, Husqvarna or Gloria, you can easily use the existing batteries. So if you already use 18-volt batteries and the matching charger for your Bosch cordless screwdriver, you can save a few euros on the purchase and pay just 155 euros instead of 210.

Only a 2.0 battery is on board as standard. However, other batteries from the "Power for all Alliance" range will also fitPhoto: BoschOnly a 2.0 battery is on board as standard. However, other batteries from the "Power for all Alliance" range will also fit

Bosch Fontus 18V-6 - Info & conclusion

  • Price 209.99 euros (incl. 2.0 Ah battery!), 155 euros (without battery and charger)
  • Scope of deliveryBattery, charger, claw brush, hose
  • OperationBattery / 18V, 4000 mAh
  • Running time (highest level): 25:30 min
  • Tank / hose length: 6 l / 2.7 m
  • Pressure / flow rate2; 20 bar / 1.2 to 2.2 l/min
The Fontus 18V-6 is a practical compact cleaner that can also be stowed away permanently in the car bootPhoto: Georg GrieshaberThe Fontus 18V-6 is a practical compact cleaner that can also be stowed away permanently in the car boot

Conclusion

The perfect appliance for a quick shower after a tour. Thanks to the tightly closed tank, the Bosch is easy to transport in the boot, even when full. Thanks to the filter, water can also be topped up in the lake. At the highest setting, the small spray gun with four spray modes reliably removes even coarser dirt. However, the weak eco mode is hardly usable on the bike. Although the hose is short, you can simply walk around the bike with the compact Fontus. At six litres, the tank is just enough for a solidly soaked bike. The test device came with a large battery, which lasted a full 25 minutes; with the standard battery it only sprays for half as long.

Advantages & disadvantages of the Bosch Fontus 18V-6 cordless cleaner

+ Compact device; reliable battery indicator; can also be transported when full

- Few accessories; small tank; weak eco mode; short hose


Test cordless cleaning devices

Here are the other mobile cleaners that we have also tested

Stefan Frey is from Lower Bavaria and loves the mossy, loamy trails of the Bavarian Forest as much as the rugged rock of the Dolomites. For technical descents, he is prepared to tackle almost any ascent - under his own steam. As an accessories specialist, he is the first port of call for questions about equipment and add-on parts, while as head of copywriting he sweeps the language crumbs from the pages of the BIKE print editions.

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