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Two things I want to add here.
First, back in the 1970's Ohio State University found that water heaters at 115 degrees f were prone to incubate Legionaire's disease. They also found that 120 degrees f would not support the disease. So keep the temp at 120 degrees as a low temp limit.
Second, In Alabama, the power co. (Alabama Power) and the gas co. (Alagasco) have a running feud. The gas co. will give you a gas water heater and install it for free if you currently have an electric water heater. And the electric co will give you an electric water heater and install it for free to replace a gas water heater. So check and see if the same climate exists in your locale.
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