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The manual will say something like Flushing the heat exchanger with a descaling solution if mineral build up is evident. Scale build up will shorten the life of the water heater, descale heat exchanger thoroughly and repeat annually depending on mineral content of ground water. (From Bosch 2400E NG user manual) or maybe something like Periodic ...


In situations like this, I generally find that the manufacturer is a more reliable source of accurate information than an installer, especially an installer whom you are not using (but then again, you might be wise not to use them, too.) Some installers learned "a particular way" which is either outdated for current equipment or was simply wrong in the first ...

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