I have one, no complaints. I think you’re supposed to flush it every couple of years. We’ve lived in our house for around 9 and only flushed it last year but the guy said it looked fine.
I am going to retire an electric water heater that I installed at 1986. I am considering going tankless natural gas. It appears to be much cheaper to run. Does anybody have any experience with the tankless water heater systems? any help would be appreciated