The unit is exactly as advertised, and includes complete instructions in case one has not done this before. The included gas valve was a plus. Although the unit arrived with a small dent in the side, that was easily repaired so the cover panel seals just fine now. The only negative I can see is the wall hanger is fairly flimsy-looking, but since most of the force on that bracket is vertical, it seems to hold OK. This heater is quite heavy, so I recommend a partner when lifting it onto its bracket. Continuous hot water at the correct set temperature is the result, and I highly recommend this particular model if 199,999 BTU is the right range for your water heating requirements.