Exactly How Hot Is Hotter Than Hell?

Just how hot does it need to be in order to be "hotter than hell"?

First, let's try to figure out just where Hell is located. Most religions describe Hell as existing deep underground. Presumably, Hell is the same distance from New York as it is from Beijing as it is from London, so, for argument's sake, let's stick it at the center of the Earth, in the planet's super-hot, iron core.