Forum Thread

Dishwasher Plastic vs. Metal Tub

digitalme 111 61 April 12, 2016 at 08:27 AM
So, our very old basic dishwasher pump finally bit the dust after making various noises for a while. I see that the new lower end dishwashers come with a plastic tub. I read that the heating element can burn a hole thru the plastic tub. I would assume this happens in the extreme drying cycle when there is no water touching the element. We rarely (accidentally) let the old dishwasher run the dry cycle. So, i hope this doesn't happen, but if it starts to scorch the plastic tub I read that a hole is repairable with plastic weld. Would I be able to put some of this plastic weld on a bad scorch mark before a hole is burned all the way thru the plastic tub?

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#2
Quote from digitalme View Post :
So, our very old basic dishwasher pump finally bit the dust after making various noises for a while. I see that the new lower end dishwashers come with a plastic tub. I read that the heating element can burn a hole thru the plastic tub. I would assume this happens in the extreme drying cycle when there is no water touching the element. We rarely (accidentally) let the old dishwasher run the dry cycle. So, i hope this doesn't happen, but if it starts to scorch the plastic tub I read that a hole is repairable with plastic weld. Would I be able to put some of this plastic weld on a bad scorch mark before a hole is burned all the way thru the plastic tub?
I can't think of a reason why you couldn't do this but I believe that if you really needed to do it the dishwasher has serious safety design flaws and it should be returned for a full refund.Roll Eyes (Sarcastic)
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#3
Quote from dale_101798 View Post :
I can't think of a reason why you couldn't do this but I believe that if you really needed to do it the dishwasher has serious safety design flaws and it should be returned for a full refund.Roll Eyes (Sarcastic)
I would agree with this, it should not burn a hold into itself under normal conditions. If the model your looking at is known for that it might be worth the extended waranty to cover it for the additional 2-3 years. You can buy it from several different places.

That being said probably good to inspect it from time to time. I have the dishwasher the came with my house and I am going to assume it's about 15-20 years old, it also has a plastic tub, Most do and no burn marks.
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#4
That is good to hear and i do plan on keeping an eye on it.

The new dishwasher with it's plastic tub only weighs 54 pounds.
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#5
Dishwashers have had plastic tubs for decades. Metal tubs are a recent trend.
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#6
I would also note that one should consider looking for a model with stainless steel dish racks. I recently noticed the racks in my 9 year old dish washer starting to rust as the vinyl coating on them has started to go. Replacements run $100+ each which is obviously ridiculous as one will buy a whole new dishwasher for $500-600 before one drops $200 on newer racks. Fortunately I was able to use re-rack to patch up\repair them for the time being. Stainless steel would eliminate this as a potential problem and might be worth the added cost depending on the model you buy.
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#7
Quote from YanksIn2009 View Post :
I would also note that one should consider looking for a model with stainless steel dish racks. I recently noticed the racks in my 9 year old dish washer starting to rust as the vinyl coating on them has started to go. Replacements run $100+ each which is obviously ridiculous as one will buy a whole new dishwasher for $500-600 before one drops $200 on newer racks. Fortunately I was able to use re-rack to patch up\repair them for the time being. Stainless steel would eliminate this as a potential problem and might be worth the added cost depending on the model you buy.
Un-coated metal racks would be more prone to damaging dishes and would likely eventually rust.
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#8
Quote from jkee View Post :
Un-coated metal racks would be more prone to damaging dishes and would likely eventually rust.

Maybe...depends on the quality of the stainless steel as there are many different types. Many higher end dishwashers seem to have stainless steel racks so there has to be something to it. Either way you know the vinyl\nylon coated junk is going to go in 5-10 years depending on your use.

As to damaging dishes, I suppose but that is of course a function of the user and how he handles\stores the dishware into the the unit more than the product itself imo. And it is not like one usually puts fine china in a dish washer anyway. But if you like to really pile on the stuff in the dishwasher, then yeah you are right, one has to consider that.
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#9
Quote from YanksIn2009 View Post :
Maybe...depends on the quality of the stainless steel as there are many different types. Many higher end dishwashers seem to have stainless steel racks so there has to be something to it. Either way you know the vinyl\nylon coated junk is going to go in 5-10 years depending on your use
I just looked online at a few high end dishwashers often the most expensive ones and couldn't find any with stainless steel racks. All of the racks were coated, granted with silvery gray plastic instead of the more historical white. Maybe some of the really expensive ones have coated stainless steel racks, I didn't read that carefully (I doubt it).
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#10
Quote from jkee View Post :
I just looked online at a few high end dishwashers often the most expensive ones and couldn't find any with stainless steel racks. All of the racks were coated, granted with silvery gray plastic instead of the more historical white. Maybe some of the really expensive ones have coated stainless steel racks, I didn't read that carefully (I doubt it).

Actually you are right in that it appears the more expensive ones have a silver rack but it is not stainless steel (which I always assumed it was). It appears to be nylon (as opposed to vinyl coated steel). My guess is since most higher end dishwashers have a stainless steel tub, they make the racks out of gray\silver nylon to look better. And if they are 100% nylon (no metal), then they will never rust obviously. I have to check out my friend's dishwasher next time I go to her place. She has a high end one and I am now curious to see if it is stainless steel or nylon.
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#11
Quote from digitalme View Post :
That is good to hear and i do plan on keeping an eye on it.

The new dishwasher with it's plastic tub only weighs 54 pounds.
Link? Or list the make and model please? This can't be a full size unit.
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#12
Quote from YanksIn2009 View Post :
Actually you are right in that it appears the more expensive ones have a silver rack but it is not stainless steel (which I always assumed it was). It appears to be nylon (as opposed to vinyl coated steel). My guess is since most higher end dishwashers have a stainless steel tub, they make the racks out of gray\silver nylon to look better. And if they are 100% nylon (no metal), then they will never rust obviously. I have to check out my friend's dishwasher next time I go to her place. She has a high end one and I am now curious to see if it is stainless steel or nylon.
Most racks are nylon (or nylon coated). Stainless steel would scratch dishes.
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#13
Quote from LiquidRetro View Post :
Link? Or list the make and model please? This can't be a full size unit.
this is pretty much the weight of a basic dishwasher.
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#14
Quote from stufine View Post :
this is pretty much the weight of a basic dishwasher.
For a built in full size under the counter model?
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#15
I never use the dry cycle on mine..... if you open the washer right after it's done and make low effort to shake off excess water, the dishes should dry themselves in short order. Why the fark am I going to spend more money to run an electrical resistance heater, when there' enough latent heat in the dishes to dry themselves?

FWIW we usually do a timed dry cycle every other night such that it's done just before we leave the house in the AM. Dishes are dry by the time I get home,
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