By default, Create Aeronautics hot air burners run freely on redstone signal alone. This mod requires the burner to be fuelled — without fuel it produces no hot air and shows no animation.
Fuel types: Solid — any standard furnace fuel inserted into the burner's item slot Liquid — any fluid tagged #aero_burner_fuel:hot_air_burner_fuels, stored in a 4 B internal tank
Fuel efficiency is data-driven: JSON files under hot_air_burner_fuel_efficiency/ assign custom efficiency multipliers per item, item tag, fluid, or fluid tag. Higher efficiency means more burn ticks per item/mB consumed.

