Cannot find it, Anyone?
I think my ethos drains by opening the 2 low point drains , opening a tap in the coach to air the system, turning my handles on the water panel under the rear of the driver side bed , then lifting the cover of the bed end to expose my plumbing and water pump ,another valve on the floor is turned to flush setting, turn on my water pump and it drains the water out just behind the rear drivers side wheel. I think a drain tap would have been easier .
Hope this helps, I just found this forum .
My 21 Ethos 20T has a fresh water tank drain on the passenger side near the rear of the side door. It is a back a bit from the vehicle side so I have to kneel down to see it. It is also marked on the side.