Hello Chris, There are three problems with having a powerful shower in a touring caravan, Firstly you have to bring lots of water to the caravan, then you have to heat enough of it so dose't go cold halfway through, then you have to get rid of the waste water. Instatntaneous heaters are not an option as there is not enough electrical power to do the job, and the limiting factor will be the regulator if you try to use gas. Caravan showers are a compromise, but certainly better than nothing.