Oil Tank Chart

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How Long Your Heating Oil Will Last

Several factors determine how quickly you will need your next heating oil delivery. Your tank size is the starting point. Most homes in our area use a 275-gallon tank, but how long that fuel lasts depends on the size of your home, the quality of your insulation, and your heating habits. A well-sealed home set to 68°F will stretch a tank much further than a drafty home set to 72°F. The efficiency of your heating equipment also matters. Older systems often burn significantly more oil to produce the same amount of heat compared to a modern, well-maintained system.

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How to Estimate Your Heating Oil Consumption

Heating oil usage changes with outdoor temperatures across Delaware, Maryland, and Pennsylvania. These averages can help estimate how quickly your supply may be used.

• Above 50°F: 2 gallons or less per day (minimal usage)
• 40°F to 50°F: 3 to 4 gallons per day
• 30°F to 40°F: 5 to 7 gallons per day
• 20°F to 30°F: 8 to 10 gallons per day
• Below 20°F: 10 or more gallons per day during peak winter cold

To estimate your burn rate, divide the amount of usable fuel in your tank by the daily estimate. For example, if you have 200 gallons remaining and the average temperature is around 35°F, your supply may last about 40 days.

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Tips to Make Your Heating Oil Last Longer

• Smart temperature control: Use a programmable thermostat to lower temperatures at night or when no one is home.
• Seal the home: Weather stripping and caulking help prevent heat loss around windows and doors.
• Professional tune-ups: A clean and properly serviced heating system runs more efficiently. Hillside offers service plans with annual maintenance to help prevent wasted fuel.
• Supplemental heat: Fireplaces, space heaters, or a ductless mini-split system can help warm occupied rooms while reducing the workload on your main heating system.

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When Should You Order Oil?

Running out of oil can be inconvenient and may cause heating system issues. To stay ahead of cold weather and delivery schedules, Hillside recommends ordering before your tank level gets too low. The ideal time to order is when your gauge reads between ¼ and ⅓ full. This gives you a comfortable buffer during cold snaps and helps avoid pulling sediment from the bottom of the tank.

• 275-gallon horizontal tank: Order at 10″–12″ (about 90–120 gallons remaining)
• 275-gallon vertical tank: Order at 12″–14″ (about 60–80 gallons remaining)

If your gauge is in the bottom red zone or reads under 8 inches, call for a delivery right away.

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