Waste oil is any petroleum-based oil that has become unsuitable for its original purpose due to the loss of original properties or presence of impurities. In the past, waste oil disposal meant paying someone to haul it away. Today, waste oil heaters provide customers with an economical alternative to disposing used oil. With waste oil heaters, the oil can be safely disposed of onsite while providing a secondary source for heating shop space. As energy prices climb, waste oil heaters are gaining ever-increasing popularity. PSI offers a wide range of waste oil heaters based on your needs.