It is important that the water hose from the source to the washer is at least 7.5 meters long.
500-600 liters of water flows through the hose and pump per hour. When you release the pistol grip, the water suddenly stopping creates a pressure wave. This pressure is easily absorbed by a longer garden hose. We therefore say as a general rule that a 7.5 m long garden hose will be enough to absorb the pressure wave without damaging the pipes/connections in the home. This is also in line with other manufacturers' requirements for inlet hose length.
Our more advanced pumps also have a function that reduces standby pressure in the pump. This means that some water is released back into the garden hose when you release the gun. This increases the importance of the length of the hose, as well as the importance of not using any kind of non-return valve.
The pumps in question are 4 and 6-piston pumps, i.e. Master, Evolution, V6.
If for aesthetic reasons you wish to have a shorter hose connected to the machine, we recommend that you clarify if this is suitable with a plumber who can assess the need for an expansion tank on the pipe system, or whether an extra one can replace the external hose length in terms of being able to absorb pressure. Expansion tanks are common in newer homes, often installed near water heaters.
Maximum length of the garden hose
As long as you have enough pressure and enough water gets through, you can have as long a garden hose as you want!
We are currently working on translating and rewriting all of our articles into English from the original Norwegian. Whilst we are proud of the quality of our language skills here at AVA, we are aware that there may be some slightly odd syntax and wording present in the articles that have been translated. The approach we have taken to this translation process is in order to get as much information as possible out to our customers in a timely fashion. Thusly the ongoing revision and updating of these articles by our British-Norwegian team will include slight changes to how the text is put together in order to bring it more into line with correct British English.