You don't say what part of the country you live in, but I've been using an
old Dearborn heater in my shop for years and would highly recommend them.
The newer ones even have a thermostat on them
the one pictured is similiar to the one I have. There is no need to vent
them and they'll keep it toasty.
they are very efficient and the unit never gets hot. Hell, I've got
magazines and a fax machine sitting on top of mine
"Units produce both radiant and convection heat to warm the farthest corners
of a drafty room without over heating near the unit. Easy to install and
provide built-in safety features for your confidence as well as comfort."
I have to open my door occasionally and it doesn't take too long to warm it
Do you not have a side door to use? If you can find a used one , they
usually go for about $100-150 bucks.
The only other suggestion I can give you is to find an old vertical house
heater, put it on a stand and have a plenum<sp> made for the top with a
couple 8"-12" elbows run off it
Again, the OP doesn't say where he is or why he wants to heat his garage.
I assumed he wanted to work in the garage not to keep his cars warm.
I have side door to my garage that I enter through, but don't try to drive
the cars through.
And a bullet kerosene stink like hell and give me a headache. YMMV
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