Heating Oil Lock, Cap or Will-Call Contracts

A heating oil contract answers one question: who carries the price risk between the day you sign and the day the truck arrives. With will-call you carry all of it, with a fixed price the dealer does, and with a cap the dealer carries the risk of a rise while you may still benefit from a fall. Across 36 winters of EIA national prices, a lock at the first October reading, with no dealer premium, cost less than buying the same 402 gallons month by month in 25 winters and more in 11.

On the stated household, buying month by month at mid-month prices cost an average of $971 a winter against $938 for a no-premium October lock, and a cap struck at the lock price would have returned an average of $68, with no value in 7 of the 36 winters. Connecticut and Massachusetts rules, set out below, decide how much of that protection a household actually gets.

Five contracts, sorted by where the money moves

Dealers use a mix of names for similar products, and Connecticut's statutes list them: "fixed price", "full price", "lock in", "capped" and "price cap" can describe a guaranteed price plan. The cleaner way to sort them is by what is promised and when the consumer pays.

The Massachusetts guide adds two practical points to the definitions. A cap is a variable price program with a guaranteed ceiling for a defined period, such as October to April, and cap contracts are more complicated to manage than fixed-price ones, so there is sometimes a set-up fee that varies widely between dealers. And when the market price falls below the cap, the guide says, in some contracts the customer pays the lower price and in others continues to pay the cap price. That last sentence is the single most important term in a cap contract, and it is the one a customer can check in writing before signing.

What the law requires, in two states

Contract protections are state law. Connecticut has the most detailed statute among the sources this page could verify, and Massachusetts relies on consumer guidance. Neither state sets the price.

Connecticut's Department of Consumer Protection restated several of these in a September 22, 2026 consumer alert: consumers are not required to pre-buy, prepaid contracts should be negotiated and signed by October 31, a fixed price locks the rate while a cap sets a maximum that may drop if the market does, and pay-as-you-go means calling ahead and paying the market price at delivery. The department cautions readers to ask how prepaid funds are secured against insolvency, whether there are exit penalties or automatic rolling provisions, and what surcharges apply to off-hour or emergency deliveries. It says plainly that it does not set or regulate prices for oil and gas products. Massachusetts' state energy office, for its part, notes that oil heat dealers are not required to be licensed in the state and suggests asking whether the dealer has already purchased the gallons it is committing, what happens if supply runs short, and how the dealer's prices compared last winter.

The household and the prices behind the arithmetic

To compare contracts on the same footing, this guide uses a single stated household and a single price series. The household burns the EIA's expected gallons for an oil-heated home for November to March 2026-27, 402 gallons, split by month as in the household use guide. The price is the EIA national average residential No. 2 heating oil price per gallon, excluding taxes, from the weekly survey that runs October through March.

Three simplifications deserve plain statement. A real will-call household fills a tank in lumps, not in perfect monthly pieces, and a real dealer quotes a fixed or capped price above the wholesale level to cover its hedging cost, which the EIA series cannot show. The comparison therefore describes what the market price did relative to the early-October price, and the premium a dealer charges for a promise is exactly the thing the history cannot reveal. It is not a prediction of next winter.

One winter worked through: 2025-26

The market started the season at $3.555 and was $5.169 in mid-March. Buying month by month cost $1,625, a fixed price at the October reading $1,429 and a cap at 10 percent above it $1,517. The fixed price saved $196 against will-call, and the cap saved $108 before any fee. The cap gave up $88 of the fixed price's saving in exchange for keeping the benefit of any fall, which in a winter of rising prices was none. A single winter shows how the arithmetic works. The next section shows how often it came out that way.

Thirty-six winters

Reading the table: the lock was cheaper in 25 of 36 winters, with an average saving of $93 in those winters, and dearer in 11, by $104 on average. The best winter for a lock was 2021-22 (saving $267) and the worst 2008-09 (costing $497 more). Averaged over all 36 winters the lock came out $33 ahead, about 8.2 cents a gallon. The winters where the lock lost are the ones in which prices fell after the first week of October, as in 2008-09, when the average price paid over the season was $2.427 against an early-October $3.663. The five largest lock savings (2007-08, 2010-11, 2020-21, 2021-22, 2025-26) came in winters when the market rose after the first week of October.

What a dealer premium does to the count

The lock in Table 5 has no premium, which no real contract offers. Adding a premium per gallon to the early-October price shows how quickly the result changes, and how often a lock would still have won.

A premium of 10 cents a gallon (about $40 on this household) would have cut the count of winters the lock won from 25 to 16, and 20 cents to 13. At 40 cents a gallon it would have won in 5 winters. The premium that equalizes the average outcome is about 8 cents a gallon, the lock's average saving. A quoted price within that range of the market is, on this history, paying about its average value; the history cannot say whether a given winter is average.

Does the timing of deliveries change the picture?

The monthly will-call assumption is generous to the buyer, who always buys exactly what is burned. A household that fills three times a winter, 134 gallons around November 15, January 15 and February 15, buys earlier and in larger lumps. Under that pattern the early-October lock cost less than will-call in 26 of 36 winters, against 25 with monthly buying, and the mean difference was -$32 against -$33. The direction of the finding survives a change in the delivery pattern, and its size does not stay fixed. The result also depends on how early in the autumn the lock is struck, which the page does not vary, and on filling the tank in the summer, when the EIA collects only one price a month and this analysis has no series.

What a cap would have been worth

A cap behaves like insurance whose payout is concentrated in a few winters. At the early-October price it would have saved nothing in 7 winters and a mean $68 overall, driven by large payouts such as $267 in a single winter. A cap set 20 percent above the early-October price would have paid out in only 9 winters, with a mean of $11. The higher the strike, the lower the average value and the rarer the payout. The figures are a way to read a quoted fee: this history paid out about 17 cents a gallon on average for a cap at the early-October price, so a fee far above that would have cost more than the cap returned in an average winter. They do not say what a particular dealer's cap will cost or whether this winter will pay out.

The fee table shows a cap's skewed shape. Even at 5 cents a gallon, the cap paid more than the fee in only 20 of 36 winters, because most winters pay little; but the winters that paid, paid a lot, so the mean stayed positive until the fee passed about 17 cents. Whether that profile suits a household depends on its tolerance for a large bill in one bad winter, not on the average, which is why the guidance from both states stresses reading what the cap does when prices fall.

Questions to settle in writing

Limits of this comparison

The EIA price is a national average, while a household faces a regional price and its dealer's margin, which the heating oil prices guide breaks down. The winters are not independent draws, and 36 of them include several regimes; the heating oil price history shows the sequence. The household is an average one. Rules in other states differ, and this page verified only two. Nothing here predicts what prices will do this winter; how the winter outlook and the futures curve are read is the subject of the Winter Fuels Outlook guide and the contango and backwardation guide. Choices about equipment, such as furnace replacement or a heat pump, are covered on EnergyBS.

Data and sources: Connecticut General Assembly, General Statutes chapter 296a, sections 16a-23m and 16a-23n, checked October 23, 2026. Connecticut Department of Consumer Protection, Consumer Alert: What to Look for When Purchasing Home Heating Oil This Fall (September 22, 2026), checked October 23, 2026. Mass.gov, Heating Oil Contracts Guide (Massachusetts Department of Energy Resources), checked October 23, 2026. EIA weekly residential No. 2 heating oil price (W_EPD2F_PRS_NUS_DPG) from the Heating Oil and Propane Update series, EIA petroleum bulk data file updated October 22, 2026, checked October 23, 2026; EIA Winter Fuels Outlook 2026-27 gallons as in the household use guide on this site. Costs, differences, cap values and averages are this page's arithmetic.