You are talking about the glass inner container of the health pot, which is generally not sold. You can only find the manufacturer who sold you the health pot and see if they can sell you one. Generally speaking, the broken ones need to be completely replaced. I suggest you buy another one.

Some time ago, I bought a Bega health pot. The inner container is all made of glass, and there is no metal chassis. I feel much healthier than my previous metal heating plate. They gave me a new one for free before I accidentally broke the glass cover.