Profile: Siebring Manufacturing is a manufacturer of commercial greenhouse equipment, agricultural equipment, heaters and custom manufactured products. Our products include greenhouse heaters, waste oil heaters, greenhouse sprayers, soil sterilization units, greenhouse carts, hot & cold high-pressure washers and shop heaters. Our royal oil heater features include stainless steel baffling, adjustable air shutter on burner for better efficiency and designed to work with a horizontal airflow pattern in large buildings. Our hot high-pressure washers give the power to strip away dirt, oil, grease and grime.