What Is Heating Oil?

Heating oil is a refined petroleum product used to heat homes and buildings. It is one of the most common heating fuels in the Northeast, including Connecticut, because it provides dependable, powerful heat during long, cold winters.

Heating oil is similar to diesel fuel, but it is specifically refined and dyed for use in residential and commercial heating systems. It is stored in a tank on your property and delivered by truck. From the tank, the oil travels to your furnace or boiler, where it is ignited to produce heat. That heat is then distributed throughout your home either as warm air (through ductwork) or as hot water or steam (through radiators or baseboards).

How Heating Oil Works

When your thermostat calls for heat, the burner in your furnace or boiler sprays a fine mist of heating oil into a combustion chamber. The oil ignites, creating hot gases. In a furnace system, those gases heat air that is pushed through ducts into different rooms. In a boiler system, the heat warms water that circulates through pipes and radiators.

Heating oil burns very hot, which allows it to heat homes quickly and effectively—even during freezing temperatures. This high heat output is one reason oil heat remains popular in colder climates.

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Is Heating Oil Efficient?

Modern heating oil systems are highly efficient. Today’s oil furnaces and boilers can reach efficiency ratings above 85–90%, meaning most of the fuel is converted directly into usable heat for your home. In addition, advancements in burner technology and system design have significantly improved performance compared to older systems.

Many homeowners today also use Bioheat®, a blend of traditional heating oil and renewable biodiesel. Bioheat burns cleaner than standard oil, reduces emissions, and helps lower your home’s environmental impact—without requiring major equipment changes.

Is Heating Oil Safe?

Heating oil is considered very safe. Unlike natural gas, it is not explosive. It will not ignite unless it is heated to a high temperature and properly atomized inside a burner system. Additionally, because it is stored on your property, you are not dependent on a municipal gas line to receive fuel.

Modern storage tanks and delivery systems are designed with safety in mind, and routine maintenance helps ensure your heating system runs reliably all winter long.

Why Is Heating Oil Popular in the Northeast?

Heating oil is especially common in New England because of its reliability in extreme cold. Oil systems produce strong, consistent heat, making them ideal for harsh winters. Many homes in Connecticut and surrounding states were originally built with oil systems, and homeowners continue to rely on them for comfort and performance.

Another benefit is delivery flexibility. Homeowners can choose automatic delivery, where the fuel company monitors usage and schedules refills, or will-call delivery, where you request oil when you need it.