1-car detached garage at my condo. that I would love to have warm 24/7 this winter. Is there any type of electric heater out there that is safe to leave plugged in constantly? Thermostat of course so it'* not running all the time. Perhaps an oil-filled radiant style? I don' t pay for the electricity in the garage.
Just remember that ANY heater should be well away from walls, shelves, and anything else. Make sure there'* a clear spot in the garage for it. And if it'* a fuel-burner, make sure the garage has some sort of ventilation.
I dated a guy once who had a propane heater mounted on the back wall of his garage. Kept it at 50 some degrees all winter long unless he was working in there. If installed in an appropriate location and with the proper ventilation (if necessary-I wouldn't think an electric heater would need ventilation) there shouldn't be a problem.