i also went to american lg website and checked manual of cheapest dishwasher that they have. it doesn't instruct to run water either. it says that if water is not hot enough cycle will run longer.
anticipating comments that LG is not american enough, i went to GE and checked manual of cheapest (349) dishwasher. it doesn't instruct to run tap either. it does say just like LG that if water not hot enough, cycles that use hot water will take more time (because water needs to be heated)
as a concrete example, the video has a section in it where he shows that his doesn't so any sensing - hot or cold water have exactly the same timing on the heater's use (and resulting water temperature graphs).
so like. I agree with you that it should be true, it's simple and cheap to implement and it obviously works better. unfortunately it's not a sane reality for tens (hundreds?) of millions of people.
cheapest GE dishwasher that i found now - $349 heats water. of course, for video he could go and find some ancient dishwasher that doesn't heat water just to make a point (or maybe he has a broken one ? ), but i think it will be outlier today.
check your user manual. huge numbers of them tell you to run your nearby tap until it's hot before starting a cycle because of this exact reason. this is also part of the video, and it has been true for literally every washer I've lived with (I read essentially all manuals), including the "good" ones.
my dishwasher manual doesn't say to run tap. in fact it says "The dishwasher can be connected to a hot water supply for further economies. If the water is heated by for example, solar panels, this would be energy efficient. However, if your water is heated by electricity we would recommend connection to cold water. "
i also went to american lg website and checked manual of cheapest dishwasher that they have. it doesn't instruct to run water either. it says that if water is not hot enough cycle will run longer.
anticipating comments that LG is not american enough, i went to GE and checked manual of cheapest (349) dishwasher. it doesn't instruct to run tap either. it does say just like LG that if water not hot enough, cycles that use hot water will take more time (because water needs to be heated)
