As the tile says, the Exoflame doesn't seem to recognize the Alchemical furnace from thaumcraft as something it can fuel. The alchemical furnace burns on everything normal vanilla furnaces do, so I think it should be able to be fueled with mana.

"The Exoflame will now ignore other mods' Furnace blocks unless they specifically opt in with the API interface." Azanor's side.

Oh, I wasn't aware this was changed. When did this happen actualy? I do remember it working before. Thank you anyway.

Looks like v 171.

If you still need it, have this: http://www.curse.com/mc-mods/minecraft/238061-tcbotaniaexoflame