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...
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.
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.
Spot on with 110v. Using an electric kettle in NA is slow af
Ah, hello fellow Technology Connections viewer!
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?
would make things more complicated - you now have to add an extra pathway from the waterline directly to the drain with an extra thermal sensor, or else you flush the pre-wash detergent down the drain.
That would significantly increase the amount of water the machine utilizes, which would push it out of alignment with efficiency regulations. There are a ton of people who don't care about this and who wouldn't want to use the extra water
It wouldn't waste more water, just more would go through the machine. If the pre-heating is necessary for it to work properly, the regulations need to take that into account, since that water is being wasted whether the operator runs it from the tap or the machine does it automatically.
Most people don't run their hot tap prior to running their dishwasher. It's really only if you notice an issue with your dishes being fully cleaned that you would even need to do it
That's why I said "If"
But if you build it into the appliance, then the appliance will waste that water for literally every load, regardless of whether the person cares about making the water hot first
Right, but it'll work properly. Appliances should work properly.
The variables are too numerous for you to say it's not working properly if it starts with cold water
I didn't say it's not working properly with cold water, I said if it needs pre-heated water to work properly as the video contends, the efficiency regulations need to take that into consideration.
Your previous comment did not say "if;" it said "should."
Incorrect.
The only time I said "should" in this exchange is when I said appliances should work properly. I'll assume you don't disagree.
Dude, my entire point is pre-heating is not always necessary for it to work properly
That's why I said "if"
So building this feature into the machine would unnecessarily waste water
It can depend on your dishwasher.
Fancier ones have heating elements to control the temperature.