I have a garage with a heater and a drain in the floor.
I don't mean to hijack or anything here, but rather add-on...so here goes:
I had a SWEET heated garage (my old one). It was nearly 36' long and 14' wide inside with a 12' high ceiling; had a 10x10 garage doors on either end with one way glass and insulated panels. I had a commercial heater installed (similar to one's you'd see at costco, but a touch smaller), that put out 150K BTU/hr. Looked close to this one (top right in first pic, below)
The only thing was, with my old garage, you'd wash a vehicle in there just fine (wooden cabinets protected my $80K cigarette inventory), but the drain in the floor was 14' long covered over with a thick metal mesh screen (see photo), and the drain was a pipe, on the SIDE toward the top, so a lot of times the suds would run all over the ground since the water level would be 1" from the top of the grate, lol. It was OK if you used very little soap. Anyway, these photos are a few years old now and I no longer own this garage or the Dodge Spirit, but you'll get the idea of how much space I had.
After a 2' snowfall in -30C temps, the garage heater would completely dry my vehicle off in under twenty minutes!