I read somewhere, most likely the makers web pages, that they are easily converted from the original style. I don't know how they compare in the RV world, but they are super efficient. I put a very small tankless (Noritz NR501) on the outside wall next to an outdoor shower I made for my Joy. I quizzed the guy at Noritz about running it on a grill propane tank. He told me I would only get a few showers out of it. He was so wrong. It works beautifully, turns on with very low water flow, and a grill tank will provide 30-50 showers.