I have 2 reznor radiant heaters in my 40 x 60 x 14' shop on a hill in North Dakota where it can get -40 some times. I like them very much, only complaint is a little noisy when warming up and cooling down. I have had them for 14 years on the only problem has been the tiny orfice will get plugged and need cleaning on the electronic starter but it about a 10 min job to remove and use the tiny torch cleaning tip tool to clean out. The most important thing is to leave the heater on, I keep my shop at 55 degs and never shut it off, the heat stored in your floor, walls tools ect will keep the heaters from running when you get a quick temp drop outside. I use natural gas and my worst bill was 231.00 for gas in January in North Dakota, and I run vehicles and my S300 skid steer in the thaw off daily. Other than floor heat, radiant is the best and most efficent, but you CANT turn it off and on, you have to maintain even temps and you will save $$$ and always have a warm shop, also 55 degs with radiant is like 68-70 with forced air and you dont have cold and hot spots in your shop.
