If you want to heat a shop the Sedore is the best bet in my opinion. I heat my 60' x 40' uninsulated shop with the 3000 and it does well at -20 to -30 F we get here. The stove also works good on sawdust, wet or dry so heating costs are minimal. Around here I can get sawdust and wood chips for free minus the transportation.
www.sedoreusa.com
www.sedoreusa.com