How Often Should You Get Heating Oil Delivered?
The right delivery frequency depends on three things: your tank size, your consumption rate, and whether you want automatic delivery or prefer to call when you need oil. Here's how to calculate it.
Step 1: Know Your Tank Size
Most CT homes have either a 275-gallon or 500-gallon tank. Check the label on the tank itself, or look for your installation documentation. The gauge on top shows fill level as a fraction — not gallons — so knowing tank size converts that fraction to an actual number.
A 275-gallon tank showing 1/4 full has approximately 69 gallons remaining. A 500-gallon tank at 1/4 has approximately 125 gallons.
Step 2: Estimate Your Daily Usage
Heating oil consumption varies by home size, insulation quality, setpoint temperature, and outdoor temperature. Rough guidelines for a CT winter:
| Home Size | Estimated Annual Use | Peak Winter Daily Use |
|---|---|---|
| Under 1,500 sq ft | 500–700 gallons | 3–5 gal/day |
| 1,500–2,500 sq ft | 700–1,100 gallons | 5–8 gal/day |
| 2,500–3,500 sq ft | 1,100–1,600 gallons | 8–12 gal/day |
| Over 3,500 sq ft | 1,600+ gallons | 12–18 gal/day |
These are estimates for a typical oil-heated CT home at 68°F setpoint. Newer, well-insulated homes will be on the lower end. Older homes with poor insulation run higher.
Step 3: Calculate Your Delivery Interval
Safe operating rule: Don't let your tank drop below 1/4 full. Running below 1/4 risks pulling sediment and water from the tank bottom into the supply line, causing system problems. Most automatic delivery programs refill at the 1/4 or 3/8 mark.
For a 275-gallon tank at 7 gallons/day peak usage:
- Full tank: 275 gallons
- Refill at 1/4 (69 gal): approximately 206 gallons used before refill
- Days between deliveries: 206 ÷ 7 = ~29 days during peak winter
In milder weather (spring and fall), usage drops to 1–3 gallons/day, extending that interval to 70+ days.
Automatic Delivery vs. Will-Call
On automatic delivery, your dealer's system calculates your usage based on degree-days (a measure of how much colder than 65°F each day is) and your historical usage rate, triggering a delivery before you run low. You don't call; they just come. This is convenient but means you take delivery when the dealer schedules it — not necessarily when prices are favorable.
On will-call delivery, you call or order online when you want oil. You control the timing and can shop around for the best price on each delivery. The risk is running low if you forget to order or get delayed service during a cold snap.
OilOutpost works best for will-call customers who want to shop each delivery. Automatic delivery locks you into one dealer; will-call lets you compare bids on OilOutpost before each delivery and get the best available price.
The Right Buffer
Whatever your delivery interval, maintain a 2–3 week safety buffer. If your tank will hit 1/4 in 4 weeks at current usage, order when you have 6–7 weeks remaining. This gives you flexibility to wait for a price dip, avoid emergency delivery surcharges, and not panic during a cold snap when every other household is also calling for emergency service.
Order Oil on Your Schedule, at the Best Price
Get competing bids from CT dealers before every delivery — will-call done right.
Get Bids →Related: Automatic Delivery vs. Will-Call Heating Oil: Which Is Better? · Degree Days and Heating Oil: How Your Dealer Predicts Runouts