> Any it's a safety hazard in homes with small children; hot water temperature should never be hot enough to cause burns when someone turns on the faucet.
That’s a matter of forced mixing. The temp coming out of the hot water heater itself should have very little to do with the faucet temp in 2021. (Yes I realize it still does)
The device is called a tempering valve. It's already necessary if you want a child-safe temperature in the bathroom, because such a temperature is below the leigonella-inhibiting temperature of the storage.
