Fortuanately, I tend to get away with a 30-min wash for most days, but someone please invent a 10-minute dishwasher please :)
- the mechanism is large compared to the capacity
- they are noisy
- they require lots of power
- they need to be pre-heated (so only make sense if you're running more than one load)
- they require more chemicals for the same load sizes
People have done it, but it's not that practical for most people, especially if you're only washing up for one or two people.
(The chemicals are probably also dangerous to the intestines, as seen on HN.)
I too would like to have a faster dishwasher. When we cook while the dishwasher is running, a queue builds up on the working spaces, and there's only so much space. It's a problem.
More pertinently, this isn't the first article I've read titled "nobody wants [x] — [conclusion]" that was confident and wrong about the starting premise. Is this the kind of thing women call mansplaining? Sounds like it.
You can. It’s just way less efficient, way noisier, and way more expensive. A Hobart conveyor dishwasher has a cycle time south of 3mn (and throughput of 3 racks/mn, with conveyor speeds reaching 6ft/mn). But it’d probably take most of your kitchen and blow up your electric panel (they need an exclusive 208V 3-phase, and if you plonk for the booster heater that’s a separate supply of the same).
It might also be less reliable, as it won’t really have the occasion to get up to spec (like only running a car for a few miles at a time and never getting it to temp before stopping).
Home dishwashers are designed to work with essentially random inputs (with acceptable results), work very efficiently, and last for long at relatively middling loads / cycling. The middle one is an especially big factor, modern home dishwashers use very little water and less power, so e.g. they’ll often cycle between top and bottom racks rather than have the water and power to run both.
Also you need much more electricity, because you need to make a lot of hot water in a very short time.
Commercial dishwashers also assume they’re installed in a location with lots of airflow and ventilation, so they can just dump steam into the room and trust the HVAC to remove it. A residential dishwasher may instead have a cool-down step during which the steam condenses, which avoids releasing steam into the kitchen.
Home dishwashers are:
delicate: do you want to replace all your dishware with horeca dishware?
quiet: nobody cares how loud commercials are , they aren't in the customers ear shot
energy-saving: commercial require 30A instead of 15A of home ones
aren't fast: how much it can clean for a 120 seconds?
SPECIFICATIONS
Capacities
Cycle Time (seconds) . . . . Light 120 / Normal 146 / Heavy 275
Racks per Hour . . . . . . . Light 30 / Normal 24 / Heavy 13
Tank Capacity – Gallons . . . 2.9
Motor Horsepower
Wash . . . . . . . . . . . 0.85
Rinse . . . . . . . . . . . 0.19
Water Consumption
U.S. Gallons per Rack (maximum use) . . . . . . . . . . 0.62
U.S. Gallons per Hour (maximum use) . . . . . . . . . . 14.88
Peak Drain Flow – U.S. Gallons (gallons per minute) . . 4.0
Temperatures °F
Wash . . . . . . . . . . . . . . . . . . . . . . . 150
Rinse . . . . . . . . . . . . . . . . . . . . . . . 180
Incoming Water Temperature (minimum recommended) . .55-80
https://cdn2.webdamdb.com/md_Ay2GESwcF7v9.jpg.pdf?1566411389
Commercial are for high throughput. Professional are for special needs, like labware or medical equipment, and have customizable cycles.
Typical cycles of 25-30 mins, and some with cycles as short as 3 mins.
But they're still about 5x the cost of a basic residential model, even if cheaper than commercial types.
Once you hit a sound rating of 44 dB, anything lower is not perceptibly different to human ears; there's a video with 55, 44, and 39 dB samples at:
* https://blog.yaleappliance.com/what-does-a-quiet-dishwasher-...
* https://blog.yaleappliance.com/quietest-dishwasher-by-decibe...
There's no sense paying for a unit that is quieter than 44 dB (though there may be other features you want to pay extra for, and you get the quieter operation 'for free').
elbow gease, is just a part of the routine. You cook, you eat and you clean.
The dishwasher tablets we use are $0.16 each. If we ran the dishwasher everyday, that’s under $60/yr. Rinse aid adds about $0.04 per load, so < $75/yr total for daily use. Are they wildly more expensive in other places?
The powdered detergents are even cheaper I think, but I’ve never had reason to consider further economizing as we run 3-4 loads per week for a family of 4.
To free time so we can pursue the things that could let us become rich.
> rich people buy one just to flaunt their wealth but dont use it
Yes, because they have people do the dishes for them
Try measuring your water usage with elbow grease.
An EnergStar-rating dishwasher has to use ≤15L on its normal cycle, even with a full load. Imagine how many dishes and pots and pans you can fit in a standard dishwasher.
* https://homeguides.sfgate.com/many-gallons-water-used-dishwa...