If I had to use heat (speaking of the intake tract here) to aid in vaporizing the fuel I would much prefer to do it with coolant.
I ASSume that’s why Chrysler had some wildly popular water heated intake manifolds. In fact, I’m sure there were several of those types of manifolds made over the years.
IMO, exhaust heat is just not consistent enough to use to aid in vaporization. Coolant (heated coolant) would be much more consistent, although you wouldn’t get much help from it on cold starts until the engine temp came up.