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How to set your hot water heater to the most efficient temperature...

First, turn it down a little bit.

Then wait a few a days to see if anyone complains.

If nobody complains, turn it down a bit more.

Repeat until somebody complains.

That’s the perfect setting.

(Did you know that in the summer, depending on several factors, you may not even need to turn on your hot water heater at all!)

See also:
https://qoto.org/@Pat/107948799721263487

(Image public domain per https://upload.wikimedia.org/wikipedia/commons/8/85/Handyman_project_to_disassemble_hot_water_heater_1.JPG)