Small 4x5x2 LV1 Steam Engine (Create 5.1.C)
its pretty jank but idk how much smaller these can get
TO START THE ENGINE:
Make sure you waterlog all the andesite stairs & add a bucket to the depot before powering it on!
wait until there is lava in one of the cauldrons, it should feed the blaze by itself.
after that, crank it the machine until the boiler starts.