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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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...
We don't need high voltage actually. By pumping cold water through the block of an honest American diesel V8, it can be heated quickly. Every house includes one for this purpose. I love the sound of it starting in the morning to heat water for my shower.
You havenβt lived until you showered from a v12!
I mean you could get a 240V line to your dishwasher in North America since a split phase 240V is what comes into the house. I'd rather the 240V water heater just do it instead.
We also have a lot of cheapish, natural gas in northern climates, so you can heat your dishwasher with gas that way if it's cheaper.
Confirming, connected to cold water here in NZ.
Different electrics, so their in-built heaters can (and are built to) operate from the cold water line.
NA dishwashers do have a heating coil, but most are only hooked to the hot water line, so that the wimpy heater doesn't have to do quite as much work or at least doesn't have to work as quickly.
We use the the same heating element that runs the drying cycle to add extra heat to the incoming water. It works, but it isn't enough to add all the heat needed to start from cold fast enough.