I went with Electric. I have a triple garage, with two bays. Connected in the corner. So a double and a single and a half size wize. I use one of the double bays to work in, so I needed the heat there. It was going to cost me $2800 to put in a 60000 btu reznor unit heater in the back corner. Based on location and having to run gas and venting that was the quote, give or take, depending on company.
I ended up getting two Stelpro Spider heaters. 4000w each. They both run on one breaker. Have their own switch so I can run just one at a time. And I got a 240v thermostat installed. The thermostat has a 4 degree Celsius freeze protection, so even if it's off, if it gets really cold out, it will kick in. My garage is pretty well insulated, so I really only need one of the heaters, but I kick both on if I'm going to go and work in there. I'm pretty happy with the setup. It was under $1300 all in.
I'm not sure this is the most cost effective if I wanted it running constantly, but for my needs, it works great.
A good cheap option is a 4800w construction heater. You need a 30amp plug installed, and you are good to go.
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