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Originally Posted by XCR-700
So how does this work for tankless heaters? Can there be no growth if there is no tank? Interesting this information is not more widely communicated. Begs the question why,,,
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I agree. I was very surprised to learn about this. The first article I linked explains why more people don't know about this: lowering the temperature to 110 degrees was recommended and even required by state codes to save energy, on the grounds that no one really needs 140 degrees for daily needs. When studies found that a higher temperature was needed to kill Legionnaire's bacteria, the government did not correct its earlier recommendation.