Rollie Systems tank heaters are used in waste oil, waste veggie oil, diesel, biodiesel, and #2 heating oil applications. Rollie's tank heaters install in minutes and are constructed of corrosion resistant 6063 aluminum alloy. Rollie Systems Heaters Are Made to Last -Corrosion Resistant 6063 Aluminum (Stainless Steel for DEF)-Safe, Dual Thermostat-Indoor/Outdoor-Ready-120 & 240 VAC Models-350 Watts – 1000 Watts Available