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@siege777 Double check the laws of your state and too. I can't say for sure if what your doing would have to be done under a license, i doubt it, but it worth being sure. Also, leaving a tankless descale alone for an hour can be risky. I've seen where those isolation valves don't shut off all...

@siege777 (Licensed plumber) Manufacturers recommend just once a year. Also, manufacturers will recommend not using vinegar, but rather a descale solution (flow aid) If you can learn to clean the flame rods it would set you apart and can easily be fit during the time it takes to do the descale...