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by novia 2740 days ago
The temperature of a typical hot water tank is 120-140 degrees Fahrenheit, which is significantly less than the boiling point of water, 212 degrees Fahrenheit. If the water tank temperature is just a little lower, at 115 degrees, it's the prime temperature for these buggers.

Also, this might be a fun read for you: https://en.m.wikipedia.org/wiki/Thermophile