Cast Iron Teapot-3 Colors

Are these stove top safe?

People on Amazon seem to heat water and pour into the teapot.

Where are they made - is there any chance they have a lead content, if from China?

If you go to that is the best place to find a warmer for under the pot, I have a cast iron system already. I was looking to get one of these for my daughter in law since she loves mine so much and I have multiple warmers (I go room to room).

They are made in China but there is NO lead content.