Pros and Cons of Tankless water heaters in RV

Crowe wrote:
We also have tankless in our house. Never again. It wastes tons of water to get hot-much more inefficient than heating a tank. The up side is we don't have this big tank in our basement, but that's about it.

Tankless is less efficient in terms of using additional water. I agree it takes a bit longer to get hot water at the faucet. THe amount of time it takes to actually have heated water Depends on how far away the faucet is from the tank. A recirculate line can solve the wait and waste issue.
However tankless is way more efficient vs. keeping 40 gallons of water hot 24/7/365.