Description
Thaumcraft Nitor support for kettles and cauldrons would be nice, so that they can be used instead of fire to boil them.

There's already Crafttweaker integration for that.

[Witch's Cauldron] Integration to register or un-register Blocks underneath the cauldron that can act as a heat source. Supports fluids

It doesn't mention the kettle, though. I assumed it was included in that, but I could be wrong.

Correct, Cauldron has CT integration for heat source, Kettle does not (yet)