Space heaters in general have their limitations. Several years back I was in search of such a critter and evaluated many options - LP, kerosene, radiant, etc. What it all came to in the end was not much as I never did anything. If my memory serves me, every fuel source had its problems.
The least problematic for me was electricity, but others may have a different need. The amount of heat you can generate from electricity is a function of the wattage. I don't have the formula handy, but IIRC, heating 1000CF of space with a 15A circuit was very iffy. Too many factors came to play - the insulation of the room (mine was none), how often the air was exchanged, the amount of cast iron (heat sink), etc. I am leery of claims that seem too good to be true - they usually are.
When I looked at the site for this heater they had a video of the heat distribution in a room. Really neat marketing tool. I think that the heat is likely distributed with a fan inside the unit - thus the heat is transferred through convection - just like your electric oven. Biggest problem with heating any room on a temporary basis is the inevitable condensation that will ensue upon cooling. I have a hard enough time keeping the rust down in my garshop without adding more headaches. This was what ultimately kept me from adding heat.
My problem was always my hands and not the tools nor the material. I found that keeping my head covered with a watch cap and wearing my Carhartt did wonders for the hands. Good luck with whatever you decide!