That’s some funny stuff.
These appliances have been out in the field for quite some time, they didn’t just arrive last week. Lots of them in service, and no one has taken a 2nd mortgage to “service” their water heater, nor have they called Geek Squad.
Most home owners around here simply ignore them until they stop producing hot water, which may take years.
(Try proof-reading your posts, they are a bit difficult to understand.)
Very true Dominic. Same thing with standard water heaters. very few people flush them monthly if ever! 
Refering to one of nachi training videos, (_Xdfvc4DJdQ/HNVCSQ29ECEW ) on this issue. It was filmed 3 years ago. I watch all my training videos on you tube.
I was just saying when the system needs to be serviced a technician needs to come and service the apparatus and regards to the computer stuff not the mechanical stuff like the piping the holding all that stuff I’m talking about the technical service