I have 2 teenagers as well. I actually think it is good if it does run out of hot water....gets them out of the shower/bathroom. If they want a long shower, then they go to the campground showers.
I did put one of the oxygenics (I think that is what it is called) shower heads on and then reduced the flow (they haven't figured out that they can adjust it! ). Seems to work out pretty good.
This thread does remind me....I would rather see if I could change out the 6 gal for a 10 gal which is what I wanted, but had to settle for what came with the new coach.
2013 Georgetown 351
Much more significant other....
2 Kids and a dog that rules!