We ran PEX pipe from the fresh water tank to the on-demand hot water heater, then to all units needing water - shower valve, kitchen sink and bathroom sink. It's all run above the ground in hopes to be able to use it in colder weather, as not to have the pipes freeze. The material expands so it's supposed to prevent cracks in case the system does freeze, it's a much more modern plumbing system than what the original trailer was supplied with. In choosing a shower system, we h