I agree, it doesn’t look like the installation instructions even mention an anode. But the user guide does show an anode where the plug is and goes into depth describing how to use a 1 1/8″ socket to remove it. But manuals can be out of date too. I almost just gave up and had Bob Howe plumbing install a Rheem for $1000. I’ll try a full drain and multiple small flushes this weekend to see if it cleans out and maybe check the hot nipple for an anode. I even borrowed a boroscope to check the inside so maybe I’ll look for that anode then after I drain and remove the drain shutoff. Thanks.