Solid Fuel Generator/3/de
From Unofficial Stationeers Wiki
Notes
The generator is not on-demand, meaning if you put in 50 coal, it will burn 50 coal with the power potentially vanishing. An area power controller(APC) will allow you to charge a battery to help capture some of the wasted energy. The APC you will only charge 1KW of power to the connected battery (plus any downstream loads), effectively wasting about 95% of your coal.