Water heater temperature
My Rheem heat pump water heater has the ability to change temperature based on a schedule. It was originally set to 120 F, but I changed it so it was 110 F (the lowest setting) except when we normally need hot water. This has resulted in a 1/3 reduction in the power usage.
However, it is recommended that water heaters be run at 140 to kill any bacteria, including legionella.
Since mine can be programmed, I would like to find an optimal setting to get the best of both worlds, efficiency and safety.
I am thinking something like, run the water heater at 140 x number of times a day for y number of minutes too kill bacteria, 120 around showers and such, and 110 the rest of the time.
Has there been any research in this area or any guidelines?
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