My wood/workshop is 1/2 of a two car garage. For years I used a Kerosene pot heater -- they're about 20" square and 4' tall, and mine was "fed" vis a copper line from a 55-gallon drum just outside the rear wall. That said, it works/worked awesome 'cept for 1/ It takes about 1/2 hr running before its heat radiates sufficiently to work; 2/ It is kind of a pia to keep buying Kero and topping off the 55 gallon drum; 3/ Like my neighbor who has a wood stove in his shop, at the time I'm done working -- all my tools, etc., are just at the right temp...
Hence -- I picked up a 230V electric heater from Northern Tool. Within 30 seconds after turning it on, the fan blows heated air, and I swear it heats the shop in 1/2 the time of the kerosene unit. Secondly, I've noted no real significant increase in electricity use bill -- certainly less cost than kero or propane would have run. And third -- I "sleep so much better" not dealing in any way with open flames -- in a garage with sawdust, lacquer vapors, and God knows whatever flammables present. I turn off and unplug the heater; wipe off table and band saw tables, drill press, etc. -- and by then it it cool.
Last -- in my locale, where regular below-zero Fahrenheit temps are the winter norm... it works.
geo