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

Input:
Question: I am confused. Some people said theirs was stainless steel on the inside -- others said it was black plastic (with just the heating element metal).
Document: I sent this kettle back because it was plastic inside as well as outside.I prefer a tea kettle that is metal; stainless steel is best.It would have been helpfull if the product description had stated it was all plastic.
I ordered this because the description said it was stainless steel inside. Only the bottom warmer is stainless, the entire housing is plastic. Plastic releases toxins on a molecular level when heated. It is damaging to your health to drink from hot plastic containers. Does anyone know of an electric tea pot, that only uses stainless steel or glass where water contact is an issue?
I guess I should have paid more attention to the reviews about it being plastic. I just assumed that the outside of the kettle was covered in plastic and thought it wasn't a big deal. I didn't realize the inside was plastic too except for the heating element. Still - that should be disclosed in the item description. I am returning it having not even tried it out.
I thought I loved this product, but i was wrong. But there is the problem with the stainless steel heating element located in the bottom of the tea pot. If you do not empty the contents it pits and there is tiny steel shards that get into your drink. But other than that this product works wonderfully. I liked it so much that I purchased another one. The heating element on this one pitted and put out time steel shards even faster than the last one did.
The Presto Tea Kettle heats up very quickly and I am happy with this product. The only drawback is that the inside is plastic except for the bottom, but I guess one would have to pay more for a stainless steel insides.
*The inside is stainless steel, so you don't get that weird plasticky smell/taste in your tea. *Keeping the kettle clean, I have not had difficulty with staining or scale build-up. *Takes the guesswork out of green and white tea brewing.The cons:*While I understand the cord is short for safety reasons, I do wish it was a bit longer. I also wish it was retractable. *No whistle.
I've read in a few reviews that the timer didn't beep. In this case either the battery is dead or it's defective and can be exchanged by the manufacturer.The pot is plastic with a stainless steel bottom. Per the instructions for first boil, I boiled about 3 pot-fulls of water before using it for tea.
I love this kettle it has the same type of built in thermometer as my cuisinart stove top kettle. This presto kettle is very accurate i checked  it  with a thermometer  to make sure of the temp right on the money! I don't mind that the walls are plastic and bottom stainless steel. I also bought a switch to plug into the kettle so  you can turn it off at the desired temp. because this kettle has no off switch.
Everything seems great about this, but if you are looking for an electric kettle that is all stainless steel on the in side, this is not your kettle. The bottom and the infuser are stainless steel, but the walls are plastic. If you're like me and like to stick away from anything plastic when dealing with high temperatures, this is not the kettle for you. If you don't mind it, then this is a great purchase at a great price.
I don't use the steeping basket I use it to heat water & poor it into a cup containing a pouch of loose tea. It has worked great for months except the battery in the timer died after 3 weeks. I haven't bothered to change it I just use the kitchen timer.Update: After over a year of being used multiple times a day I forgot & left it on. I don't think much of the boil dry setup it did shut down the heating element, but only after the water was gone.
Answer: I called Presto today, 03/06/2014, and the clerk said the interior is anodized aluminum.