Update from over the pond. We're well into our 2nd year of NR-210A ownership. I did an annual flush of the system before I deployed (NOV '11). My wife asked me about the servicing recently and said that she wanted to learn in case ... well ... you know. Since I clearly marked incoming/hot water, bought/cut the service lines/bucket, it was all there. I just pointed her to a YouTube video and she nailed it first time. I think she'll be OK. So far, we haven't had to call anyone concerning our hot water needs. I feel pretty comfortable with our experience. As I go back to wonder why my experience is different from others, I believe that it's still the quality of the installation, it's certainly not a DIY job. TY'all for my learning experience.