this post was submitted on 10 Nov 2025
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Today I Learned (TIL)
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Wouldn't all the dishes and utensils be exposed to lead when you use the dishwasher then? Or is it negligible as long as it's not directly ingested?
Did a bit of research and there is a lot of disagreement on whether dishwashers should be connected to hot or cold supply lines. Might depend on the model somewhat.
I can't speak for outside the US, but in the US your dishwasher needs to be hooked up to a hot water line. The detergent won't dissolve properly under 120ºF - 140ºF and they are restricted from using enough energy to get from "cold" to that temperature. Most of the manufacturers will even print in the manual that the water temperature coming in needs to be 120ºF so it can get hot enough to perform all functions.
If you hook up a US residential dishwasher to a cold supply line, you will be hand-washing all of your dishes.
Outside the us a lot of us have 230V power, so all of the dishwashers I've ever seen have their own heater and only hook up to cold.