Listed equipment sold and installed via authorized distribution including installed mcewing birthdate a plumbing professional would be labeled. The Do-It-Yourself person may be able to handle many small household jobs, but the installation of a water heater could create a dangerous situation if performed incorrectly. There are many local codes and safety requirements that pertain to water heater installation and operation; without understanding these requirements you could be breaking the law as well as endangering yourself and your family. Internet sale sites offering BWs direct to consumers or a "plumber" who is not an authorized BW dealer are always questionable.
I love the art in that book. Do you still play. I really miss my Dungeon Master. He was the best man at my wedding, actually.