If based on instructions online, I would have given it a 3, but when we got it and tested the "water pressure" of our master, it didn't fill fast enough, so we are using in our lower level rental instead (yea, renters!) because we LOVE this toilet! I wish we had tried to install in master to just be sure and then moved it, but we were worried about it. Once installed, flushes great for being tankless, all the nozzles are great, heated water and seat are 100%