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If you have a toilet that, when flushed, turns your shower into lava, adjust the toilet filler valve so it's barely open and you'll have much less of a problem.
Also, if the water coming out of your faucet is hot enough to harm you, turn down the temperature of your water heater. You will save quite a bit of money too.
Edit: and check the anode in your water heater every 5-ish years. So much cheaper and easier to replace that than the entire tank. Pay attention to your water heater.
Just commenting to say you cannot simply lower the water temperature. If you go too low there is a risk of legionella and nobody wants that. So please, before you lower your water temperature, do some research.
I believe 60 degrees is basically the lowest you can go safely. Different sources seem to indicate that.
What about on demand heaters?
Absolutely correct. However, I've lived in apartments where I couldn't control the water heater temperature and other people might be in the same situation who might benefit.