A product I've been interested is one of the Zodi products. They have a single or double burner that uses small gas tanks or a camp model that operates off a 20# LP tank. That's the one I'm considering. It has a submersible pump that you just drop in to any water source and it pumps it out and heats it up (assuming of course you light the burner!!). My only criticism is that the flow is only about 1 GPM so it won't likely be a luxurious type of shower. I may get one to have here for emergency use (hurricane season) then take it to the woods to our camp. If I do I'll post my thoughts about it.