We have used our stackables without hookups using both the water pump and the generator. We generally "exercise" our generator by using the dryer. Now granted, we can only do a couple of loads and still have enough tank capacity for other things for a couple of days. I dislike the dirty laundromats that we always seem to find even in campgrounds including the military campground where someone urinated in the dryers. Yes, you could see and smell the urine and would you want to dry your clothes in those machines even after clean up? At least with my own machines, I know what has been washed. And we can do laundry when we want to, usually first thing in the morning or in the evening when we are sitting around in our pjs.