In article ,
Ignoramus7637 wrote:

http://igor.chudov.com/projects/Garage-Heater/

Iggy, the right question is:

Which is cheaper - a UL listed heater, or a homebrew that might offer
your insurance company an out (excuse not to pay) if there's a fire?

Creative home-made stuff is all very well, but sometimes it's not a
great idea. I suggest that this is one of those times. Perhaps in extra
doses given your Chicago-area location...I seem to recall that they have
all sorts of extra restrictions on wiring dating back to Mrs. O'Leary's
cow.

That said, you want a lot more fan, probably a big squirrel-cage blower
rather than a wee muffin.

--
Cats, coffee, chocolate...vices to live by