Heizöl is a type of fuel oil commonly used for heating residential and commercial buildings. It is derived from crude oil and is specifically designed for use in oil-fired heating systems. Heizöl is stored in tanks and is delivered to homes and businesses as needed, providing a reliable source of warmth during colder months. There are different grades of Heizöl, including Heizöl EL (extra light heating oil) and Heizöl S (standard heating oil). The choice of grade can affect efficiency and emissions. Proper storage and handling are essential to ensure safety and compliance with environmental regulations.