Does anyone know why or why I shouldn't put a residential toilet in my RV. Weight is no issue, as I pull with a F350 dulley. I just don't like the RV toilets, and for the life of me I see no reason why I can't put a space saving and water saver one in. The one I am looking at flushes with just .08 gallons and 1.6 gallons. Also has anyone switched over their hot water tank to the new tankless(RV 500). It's says it's Uses less propane and a endless hot water at 120 degrees. I can't seem to find anyone that has it or has seen it in use.

I see a couple of potential problems, RV toilets typically are closed systems, opening to the holding tank path only occurs during the flush, there is always a positive lock to the holding tank. Also some RV toilets like ours have a built in Macerator, waste gets broken down immediately during the flush. You mentioned water consumption, not sure but I think RV toilets use less. What don't you like about the RV toilet? There are so many available out there, they are very much like your home toilet...G

There are lots of issues. But the biggest one for an RV that moves is that the relatively great amount of water in the bowel is going to slosh around a lot.

What is not to like about the better RV toilets? They are nicely sized, full china, and you can get electric flush if you so desire.

Try a search on line for a small on demand water heater. I believe I have seen one for rvs, the plumbing fittings are different from a residential unit. I replaced the toilet with an rv china toilet, it is heavier so you have to make sure your floor supports are stronger. Pieere