I purchased to use in my shop, wood shop 20x35 ft, cement floor, enough holes in the metal to leak like a sieve. 1st heater I bought and run in the shop. I use red diesel or off road diesel, lower price no tax for roads. Relatively fuel efficient. I thought this one would be nice since I can install pieces and parts to fit my needs. decided I like the all-in-one style, will most likely buy 2 more for this winter. I haven't fixed all the holes yet. arrgh