Apparently pre-rinsing confuses the dishwasher or something. Not doing it leaves me with residue all over the other dishes though π€·
this post was submitted on 13 Oct 2026
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Do you run the water in your sink until itβs hot before turning on the dishwasher? Most kitchens are set up so they use the same water line, and starting with cold water if you donβt do it will make it clean worse.
That's a thing with diswashers in North America, but not in Europe. In Europe, dishwasher are almost always connected to the cold water line only. OP seems to be posting from New Zealand, I don't know how they handle it.
It's handled like that in North America, because their mains electricity doesn't output enough juice to operate a water boiler at a reasonable speed:
https://en.wikipedia.org/wiki/Mains_electricity_by_country
So I imagine, in pretty much the rest of the world, it works like you described for Europe...
Confirming, connected to cold water here in NZ.
Ah, hello fellow Technology Connections viewer!
Interestingly, where I live I have never, ever seen a dishwasher installed with a hot water line. Even the cheapest dishwashers heat their own water, and around here we apparently always plumb them to the cold water for some reason, even though I'm sure plumbing to hot water would at least save time if not get better results.
I'm the opposite. All I've known is direct connection to the household hot water tank. The dishwashers all have a "Heat Boost" option which activates an element inside to add more heat if you want, but generally hot water tanks are kept about 57Β°C, I've never in my life used the heat boost setting. That's for sterilization.
I just watched through the video someone else posted, and connecting to the hot water line seems to be a North America thing. Presumably due to the 110v power supply taking a really long time to heat.
Obligatory obstinance: if that was important to the process why does the machine not handle it?
That said, I do run the water until it is hot. Typically to wash the dishes that require hand washing like my nonstick pans.
It can, but the water heater in your building/house is a better heater than the dinky one built in to the machine
I think they're asking why does the machine not purge the line to make sure there's hot water. Why do I have to run the hot water faucet until it's hot when the machine could just do that and then drain the cold water?
It can depend on your dishwasher.
Fancier ones have heating elements to control the temperature.