Dyna-Glo 180,000 Btu
If you operate a heater with running motors (or equipment that emit fumes), you probably prefer to keep the door unlocked. If this is the case, we are afraid to tell you that nearly all of the items on this list would be ineffective. For such scenarios, you will need significant air movement, which means that only a high-Btus item can fulfill your demand in an open-air environment.
That is why we believe the Dyna-Glo 180,000 Btu heater is the best option for you. The Dyna-Glo 180,000 Btu heater operates on kerosene (or diesel fuel) and has a maximum heating capacity of 4,000 square feet.
In truth, this item is not suitable for confined or small-scale locations, since it is very loud, needs extensive ventilation, and generates moisture that might condense on your gear. However, with an opened overhead door, all of these mentioned disadvantages will vanish in a blink, leaving a significantly warmer work atmosphere for you to carry out your tasks.
Ratings: 4.6 stars (from 1518 reviews)
Price: $560
Buy it at: https://www.amazon.com/dp/B0146E0OYC