Diesel Heaters from Equipmentland. A full range of diesel forced-air heaters from 40,000 BTUs to one million BTU/hr diesel heater trailer from the leading manufacturers. This page includes all models of diesel heaters; also view by Direct Fired Diesel Heaters and Indirect Fired Diesel Heaters. Not sure what you need? Give us a call at 1-800-2141649 for help.