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28 Aug 2003 at 4:31 pm
#295032
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It can grow at 107F which is the bottom tank temperature of a 120F water heater. http://medic.med.uth.tmc.edu/path/00001519.htm
The low water temperature helps prevent scalds and inmproves combustion efficiency, however, it also promotes growth of various organisms. Move the water temperature up and use a quality tempering valve to lower the outlet temperature.