275 vs 330 Gallon Oil Tank: What Size Do You Need?

Posted Sunday May 24, 2026

Replacing your oil tank or buying a home with oil heat? The most common question is what size tank you need. For most Long Island homes it comes down to 275 vs. 330 gallons — here's how to choose.

The Common Sizes

• 275 gallon: the standard for most single-family homes. Comes in vertical (275V, taller/narrower) and horizontal (275H, lower/wider) shapes to fit different basement spaces.
• 330 gallon: a larger option for bigger homes or households that want fewer deliveries per winter.
• Two tanks (e.g., two 275s): used by larger homes or estates that burn a lot of oil — doubles capacity without a single oversized tank.
• Smaller (under 275) or 550+ : less common for homes; 550-gallon and up are usually larger properties or light commercial.

How to Pick

Think about three things: how much oil you burn (a drafty older home or a cold winter uses more), how often you want deliveries (a 330 or two tanks means fewer fills), and the space and code for where the tank sits. If you frequently run low between deliveries on a 275, stepping up to a 330 — or adding automatic delivery — smooths things out.

Match the Tank to Your Habits

Whatever size you choose, the goal is to never run dry. Learn to read your gauge and reorder at a quarter tank, or skip the math entirely with automatic delivery and tank monitoring. If your current tank is old, also review the signs you need a new one.

Order Oil for Any Tank Size

Oilex Fuel delivers to 275s, 330s, and larger systems across Nassau County. Order online or call (516) 333-2703.