5kW Diesel Heater vs 5700 Cubic Ft Garage

My garage is just a 22'x22' two car, but it has an 11'9" ceiling. I added insulation to the garage door and am thinking the only other insulation is at the interior wall. I slapped up a 5kW diesel heater that is made for campers and trucks to see how well it can keep up. At first I'm skeptical, but now that it got to temp I'll measure consumption over a few days to find out for sure!

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