This thing MIGHT run like a champ but I never found out. Why? because there was not a suitable location to vent the water heater in my inside-of-group rowhome. It can't be vented into an existing chimney like the old tank heater that only drew 30,000 BTU's of gas. The vent has to be 4' from a door or window and the basement windows and first floor rear door didn't have the clearance. Also, check your gas service if you are using NG to be sure your service and meter will support the 140,000 BTU gas load. Mine would not. The gas company would do the upgrade free of charge but it would entail digging up the front yard and replacing the gas meter. Installing this thing unless you live in the boonies is a job for a licensed plumber/gas fitter.
- How accurate was the on site description of the product? poor