This 515,500 to 1,000,000 BTU indirect-fired heater is diesel powered and built with heavy-duty materials. This towable heater for sale is capable of 3,200 to 9,600 cubic feet per minute (CFM) of airflow, ideal for large industrial spaces. Our high-volume heater weighs 3,700 to 4,600 lbs. depending on model and can provide heat for a large building. Brands include reliable manufacturers like Allmand and Frost Fighter.