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I went through this process, looking at natural gas vs. a big heater, and finally I bought this cheap 240v heater for $120 and installed a 240 outlet.https://www.amazon.com/gp/product/B003XOZN7AWorks well for such a small unit. Heats up my 2 car garage to 65+ in about 10-15 minutes. And I only use it when I'm working.However, I also insulated the garage and added wall board. And a concrete floor makes a huge difference, as it retains the heat.I live in Southern New England, so it gets down to the 40s 30s and sometimes 20s in the winter.I didn't notice any huge jump in my electric bill.
might be the perfect opportunity to build a "popcan heater". All you require is a bunch of empty beer cans (sure you have some), some black paint, a hot glue gun, an old window, and some ABS or PVC pipe. Cold air out of the garage through the lower air intake, into the heater... swirls through the black cans, out the top and piped into the garage space through the upper air outlet. If you wish to store some of that heat, build a thermal-mass battery inside the garage and route your air outlet piping through it before it vents into the garage.
My shop isn't huge, but one of those oil-filled 110v electric radiant units heats it easily (in the middle of the lowest range). Efficient and safe...
If it's an outside shop a small air tight wood stove works great if you have aces tona little wood, it don't take much. You can find them real cheap and sometimes folks will give them to you just to get them to you just to get them moved. A few sections of wood flue lined properly installed will finish up the job.
Reznor.
Love me an airtight in an unheated workshop. Damn things will get hot enough to sweat you out of a trapper's tent in -40.
Yep. Years ago I had a commercial loft in a cement building with 10' walls of leaky windows. Heat went off on Friday afternoon and didn't come back on until Monday morning and it was like a meat locker in there with all that cement. Installed a Reznor gas fired heater with a thermostat and that place would get toasty in a blink. And no fumes.
Tried the upright oil-filled elec heater yesterday during the apocalyptic nor'easter, and after about 2 hrs you could sense the temp increase, and the wall thermometer said it rose about 5 deg (up to 40 deg). Might have done better if I had a fan circulating the air, but I think I'm going to scour CL for a decent Kerosene heater.