The system never went through a visible cycle. There was nothing evident in the tank nor did my numbers ever vary to show something was going on. This is the first thing that's happened since it's been up. I remember your thread on the ATS and have given it some hard thought. I thought you did a really nice job with it. Space is at a premium right now unless I figure out how to get water up to the attic without cooking it during the summer and turning it cold during the winter.