Coleman Furnace, 100,000 BTU updraft style, like in houses, 25-30 years old, have some B-vent if needed, some new parts, fan works. $50 obo
I never got around to installing it in my garage, not enough space, instead i caved in & went with a rebuilt calcana heating unit which is off the ground.
live in the furthest S.W. corner of the city