A new era in oil heat from Alvin Hollis. Sulfur Free BioHeat® heating oil is made from 95% sulfur free heating oil blended with 5% renewable energy materials. Sulfur Free BioHeat burns much cleaner that traditional oil, providing a 90% reduction in particulates emissions. It also keeps your heating system’s interior surfaces cleaner throughout the year, providing higher system efficiency and resulting in less maintenance and a longer system life.