When do I need an external lifting pump / drainage pump for operating the washer-dryer in my motorhome, camper, or boat?

Created by Thorsten Grosse, Modified on Tue, 2 Jul at 10:13 AM by Thorsten Grosse

If the drainage hose between the machine and the greywater tank (or container) is no longer than 2 meters and has a minimum slope of 10 cm per meter, you do not need a lifting pump for operation.




You need an external lifting pump for operation whenever:

(1) the inlet into the tank or container is higher than the outlet of the machine





(2) the slope between the machine and the tank is less than 5 cm per running meter of hose length 






(3) the hose length exceeds 2 meters

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