I've had 3 RV's 2 with tank system and the latest one with tankless. I was lucky and didn't have any problems but they require yearly service and most other people had a lot of problems. They are way more complicated, on other forums there have been many complaints of problems that people can't seem to get fixed. If I get another rv it'll have a tank system. Much simpler and easier to repair. But at this point in my RV life I can say that about most things after owning a high-end coach with all the bells and whistles. Great when they work a REAL pain when they don't.