Had 2 of these. 
First one broke after one use, tripping the house electrics. When I unscrewed the bottom the element which heats the pan had exploded!  I received a replacement.
The second one arrived, again used it once and it exploded, again on unscrewing the base, the element was totally blown apart. Could have been dangerous.
Sent it back to wayfair, who gave me a refund. They were great but product was not.