Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Is the cover made of glass or plastic?
Document: I cant. Believe this oven was not made out of glass. Ive had mine for almost 1yr and the plastic.dome is totally cracked. Big giant cracks that my boyfriend had to wrap. Gorilla tape all around it. Super depressing could be a really great kitchen aplliance
I'd like to tell you how this appliance performed as an oven (very enticing in the ads), but I never made it that far. It's made of plastic!! I should have known -- as soon as you turn it on, the whole room reeks of the smell of plastic! I highly doubt it's healthy to breathe, let alone eat whatever gets into the food. Stick with glass and steel. I found a nearly identical product available that is constructed of glass and steel, which works wonderfully.
My husband and I absolutely loved our NuWave Oven. It was amazing how it cooked from frozen! But, it is not durable at all. We had to get the racks replaced.... It is not stainless, just coated, so you have to be very careful how you clean it and you cannot soak it. Then, the plastic cover cracked...eventually all the way around! Luckily, we had purchased SquareTrade warranty, so we were able to get our money back.
If you go online you will see that this New Wave oven has a major defect. The plastic cover will crack eventually. I used it once a week for about a year and the crack happened, rendering this piece of junk useless. You can also NOT wash this in the dishwasher because the cover will stain. I received this as a gift and felt compelled to tell Amazon customers about this in the effort to save you money.
I purchased my nuwave oven off of an infomercial, during a blizzard. It was the best thing I ever purchased!I have been using mine now for four years. My only complaint involves the plastic cover, which has cracked twice. Fortunately, a used replacement (new ones aren't available) runs about $25. Since I stopped washing it in the dishwasher, it has not cracked again.I use this for meats, rolls and biscuits, frenchfries, just about everything.
The bottom line is that any horrible ordeal that you may suffer through is better than cleaning a conventional stove or wall oven by hand. Having said that, my NuWave plastic dome crumbled after a dozen uses or only a few hours of cooking. I sent Hearthware my Macy's receipt with a $14 check for shipping; then waited 32 calendar days for the replacement. Otherwise most of what is said is true. If you cover the bottom with foil the interior will clean up with a wipe.
For the money spent on this product, it should have been reinforce glass not thin plastic rings. I will have to return, because I'm not willing  to take a chance on thin  heated plastic that will crack eventually,
I previously used Flavorwave oven for many years and when my plastic cover cracked I tried to order from them and they do not have a replacement part. I just happened to see Nuwave ad on catalog and decided to try. I order through Amazon, was delivered just in time for our Thanksgiving day. I cooked 13 pound turkey and came out better than I have ever seen. Unit stayed clean during the cooking time and so easy to clean afterward. Love it and will recommend this to anyone!
Ask yourself why they don't install on the original unit. You ask why did I buy a second unit. My first unit lasted about 1 1/2 years before the cover cracked (one year warranty). The second unit cracked after about 6 months. I like the way it cooks but the company sucks for customer service and the product is not made very well.. Don't spend the $130 on this unit.....
I've owned one of these for about 3 years now. It has been a Great Oven and I would recommend getting the Extender Ring, The Ring came in handy when I did my Turkey, Which turned out perfect.Recently my Mother In-Law wanted Mr. T's Flavorwave, Which intrigued me because it has a Tempered Glass bowl rather than the Plastic one of the NuWave, However as we were ordering it, It became very Clear why the Nuwave is better.
Answer: Dear Jack-It's not glass, but some kind of plastic that stands up to extreme heat. The unit (at the top) and plastic dome gets very hot. If you have small children keep it way back on the counter where they cannot pull it down on top of them.