Does his run on electric, or natural gas? I have heard that you don't want one that is electric, but mine runs on natural gas, and I cannot be happier. Cannot go back to a tank once I have had tankless. We have a two person jacuzzi in the master bath, and you would need a 75 gal tank just for it. Mine is an 8 gpm Rinnai and I can run the hot water in two showers and the dish washer at the same time, go on vacation, and when I return home, the water is still running hot. Haven't had the first second of problem. I highly recommend one.