I built a home in 2005 and installed a tankless, gas, water heater. I spent $1100 as I recall and never had one problem with it in the 10+ years I owned the home. I never flushed it, but did check the filter. I was on a well and that may have made a difference. I am not sure that it saved me any $$$ over the years, but there was no water heater tanks to be concerned with either!
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