Tankless Water heater

I agree with Effy with one out. If your travels always have you in camp sites with full hook ups and you spend a lot of time in the coach, such as full timer of snow birding, it might be workable. To get hot water from a tank less system you need a moderate water flow. More flow is more water into the gray tank. Might not be the most ideal situation for a weekend or holiday camper.

Probably the best option for a coach is a two or three way tank heater. Propane, electric and engine heated. I have a two way heater and 95% of the time heat water with the electric rather than propane.