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Edit: okeedokee I'm wrong.
GE Appliances: Dishwasher - Correct Water Temperature
Ummm...what are all the USA people in here talking about?
I've installed and replaced my own dishwashers 4 or 5 times over the years and helped friends and family members many times. They only last about 5-7 years so it happens often enough for it to be routine for me.
The water supply is connected to the cold water. The dishwasher has it's own heating element. It heats the water to "sanitizing" levels. There's even a sanitize button.
That water gets so hot that I can't open the door mid-cycle with my reading glasses or they'll get completely fogged up.
The sanitize button is not a new development...
They aren't all designed to connect to your cold water line. In fact, most seem to specifically instruct you to connect to your hot water intake. You are right that most in the US have water heaters, but that doesn't mean that the machine's cycles will heat the water effectively for the full duration of the wash.
Maytag, Whirlpool, GE, and LG all recommend you connect to hotwater. Bosch (EDIT: Spelled this like the drug company not the appliance company) recommends cold. Depending on your machines cycles as well, the heating element may not get the water hot enough to make effective use of the pre-wash cycle. If your machine is connected to the hot water line and you purge the cold water from the line, you will see a more effective pre-wash (and thus more effective wash) than if you let it run cold.
North America vs Europe, North America cannot heat the water fast enough due to the limit of being on a 120V and 15 A circuit.
They have 120 volt electricity, it can't heat quickly enough, so the wash cycle will begin with less than optimal temperature and take a while to get to sanitizing temperature.
So they feed it water from the hot water tank, which isn't hot enough usually but the heating element can get it up to temp much faster at 120v.
Many modern dishwashers only have a cold water inlet so it literally does not get water from the hot water tank.
120V really doesn’t matter that much as they are commonly on their own 20A breaker. At 1500W of power it can heat 1.5L of water from 60F to 168F in 1 minute.
Where are you getting your information? Can you find an example of a dishwasher where the installation manual says to use cold water?
And the claim that 120v doesn't matter is baseless.
Lol no it can't, are you nuts? That's physically impossible and mathematically incorrect by a factor of more than 4.
My information is based on installing 3 dishwashers in the US that all said to either connect to cold water or give an option for cold water or hot water
Voltage doesn’t matter for heating what matters is overall power. 1500W at 120V and 1500W at 450V both heat at the same rate. The advantage of higher voltage home systems is they usually allow higher power since current is generally the limiting factor but they make higher current breakers for 120V
I was off on my conversions and did calories instead of joules. Either way it takes 4 minutes to get from 60 to 160 which is still trivial on a multi hour cycle
Here is one that allows either connection but emphasizes increased efficiency with hooking up to cold water. I admitted I was wrong on my conversions will you admit you are wrong that they have to hook up to hot water?
https://us.mieleusa.com/MieleMedia/docs/operatinginstructions/Old-Archive/Residential/Dishwashers/English_manuals/Installation_Instructions/Full_Size_install.pdf
"For fastest possible wash times, with slightly higher energy consumption, connect the dishwasher to a hot water source. Hot water supply specifications: Recommended temperature: 120 °F (49 °C), max 140.
I never said that.
So weird. You want to be right? Okay, you're right, you don't have to hookup to a hot water, it's recommended and commonly done... I don't think I claimed you have to... The reason it's recommended to hook to hot water is because it's slower at 120v. They all allow you to do whatever the hell you want, but American tap water (which doesn't sit in a rooftop tank that gets warm as it sits around, but that doesn't apply much in the northern hemisphere) is typically not ideal.
You want your dishwasher to take longer? hook it up to cold water and save some electricity, you do you.
Why would I use 1500W at 240V? My dishwasher has a 2100W heating element, which heats 40% faster, that's not negligible. You can get higher wattage models.
You installed 3 dishwashers? That doesn't make you an expert on international dishwashers, it just makes you a homeowner. Jesus, you don't have to just argue for the sake of arguing, just say "I learned something dumb today" and move on with your life.
You said "Many modern dishwashers only have a cold water inlet so it literally does not get water from the hot water tank" and then provided an example that says what I said, if you want a faster wash use hot water.
The reason most of the world uses the cold tap for dishwasher hookup is because they use a higher wattage heating element, which they can operate safely because they use 220V power. I didn't come up with the 1500W limit, you did, don't move the goal posts.
You probably have higher voltage and more power going to that heating element, so the cold water line is fine. In the US, the heating elements in our dishwasher can't draw enough power for cold water, so it needs to start with hot water.
Also, 5-7 years is... Pretty bad. It's not uncommon for dishwashers to last multiple decades here. I'm pretty sure mine is at least 20 years old (and ugly lol)
I run the dishwasher every night, even if there's just a few dirty dishes, so I'm pretty hard on my dishwasher. I use the heck out of it.
It's caused lots of wailing and gnashing of teeth in my family but I can't stand unloading a dishwasher packed to the gills with a week's worth of clean dishes. Just get it done as part of a daily routine.
Not USA but North America and we ours is hooked to hot water. Has to do with having a shitty heating element since they wanted it to be plugged into 120 15A circuit.
I checked under my cabinet just recently, and the dishwasher is indisputably connected to the hot water line.
It was like this in the last place, too, and my sibling’s place.