1. The short answer
A fixed price contract locks in what you pay per gallon or litre of heating oil before the season starts, and a pre-buy or cap price plan works the same way but with slightly different downside protection; none of them are a bet on where the market goes, they are a way to buy certainty at a price the dealer sets today. With Brent at 104.07 USD/bbl on 17 September 2026, still up 54.3% over the past year (Trading Economics), and German heating oil at 181.0 cents/litre the same day, up 16.8% week on week (Tecson), the appeal of paying a known price now is obvious. What is less obvious is what you give up, and what the dealer charges you for taking on that risk.
This entry treats a fixed price agreement as a transfer of price risk from you to the dealer, priced into a fee or a slightly higher rate, not as insurance in the strict sense and not as a market bet either. It also touches the closely related spot versus futures pricing question that sits underneath every one of these contracts.
2. The three contract shapes, and who decides the terms
Three contract shapes are documented for US heating oil dealers: pre-buy, cap price, and the plain fixed price agreement, and each shifts risk differently. In a pre-buy, you pay a fixed rate per gallon before the season for a set volume; the price never moves again for that oil, whether the market rises or falls (shipleyenergy.com, retrieved 18 September 2026). A cap price sets only a ceiling: if the market price falls below your cap, you still pay the lower market price, and the dealer charges a separate service fee to cover that one-sided risk (shipleyenergy.com). The New Hampshire Department of Energy illustrates this with an example: a 100 USD cap fee on 1,000 gallons breaks even only if the market price averages about 10 US cents a gallon below the cap over the season, an example, not a market average (energy.nh.gov, retrieved 18 September 2026).
Who decides the terms is the dealer, not a regulator, in most of the country; your real negotiating room before signing is volume, term length, and whether a cap or a straight fixed price fits your budget. A related way to lock in favourable terms without a season-long commitment is a group buying arrangement; it can lower the price per order, but it does not provide price certainty for the season, and no documented price comparison between the two routes exists. It also does not address what happens if the dealer cannot deliver at all, a situation some contracts handle under force majeure.
3. The numbers: one worked example against the legal backdrop
The table below sets out the only figures documented for this entry, each with its own date and source; no general market markup is shown because it does not exist as a published figure.
| Item | Figure | Date | Source |
|---|---|---|---|
| Cap price break-even example | 100 USD fee on 1,000 gallons, breaks even at about 10 US cents/gallon average discount to the cap | Retrieved 18 September 2026 | NH Department of Energy |
| Pre-buy insolvency safeguard | New Hampshire requires pre-buy providers to post a surety covering the prepaid volume | Retrieved 18 September 2026 | NH Department of Energy |
| German civil law position | Dealer carries supply and calculation risk; cancellation “regularly to be denied” under § 313 BGB | 12 March 2026 | Verbraucherzentrale Hessen, confirmed by t-online, 13 March 2026 |
| Heating oil price backdrop, Germany | 181.0 cents/litre for 3,000 L, up 16.8% week on week | 17 September 2026 | Tecson |
| Crude oil backdrop | Brent 104.07 USD/bbl, third consecutive daily decline | 17 September 2026 | Trading Economics |
Two rows above describe an example from a single US state agency and a single German advocacy body, not a nationwide average; treat them as illustrations of how the fee and the legal protection work, not as the price or protection you should expect elsewhere.
4. Why there is no honest percentage markup to quote
No source reviewed for this entry documents a general, market-wide markup in percent or cents for a fixed price or pre-buy contract compared with the spot price, in the United States, Germany, or anywhere else, and this page does not invent one. What is documented is one worked example and one legal position: a dealer builds a margin into the cap fee to cover the risk of falling prices, and in Germany a signed fixed price binds the dealer regardless of how the wholesale spot price moves afterward.
You can find your own markup with two numbers: the fixed or capped rate the dealer quotes you, and the day's spot or rack price for the same delivery area on the same day, which price reporting services such as Tecson in Germany publish daily. Divide the difference by the spot price to get your own percentage, and repeat the comparison over a few days before committing, since a single day's quote can move sharply, as German heating oil did with a 16.8% weekly rise to 17 September 2026 (Tecson). This is arithmetic you do yourself, not a number this page can supply for you.
5. Who needs the certainty, who is better off staying flexible
A fixed price or pre-buy contract suits a household that wants one predictable heating bill and can accept giving up any benefit if prices fall; a household that can absorb a bad month, or that expects prices to soften, is usually better off staying on the market price and buying by the tank as needed. Planning certainty has a cost, built into the cap fee or into a slightly wider margin on the fixed rate, and only you can weigh that cost against the value of not having to think about the market again this winter.
Before signing, check three things. First, what happens to the exact amount you prepaid if the dealer cannot deliver, including insolvency; only New Hampshire is documented here as requiring a surety bond for this specific risk, so ask directly what protects your prepayment where you live (energy.nh.gov). Second, what happens to unused volume at the end of the contract term, since this is explicitly flagged as a point to clarify rather than assumed to be refunded (energy.nh.gov). Third, whether the cap or service fee is shown as its own line, so you can compare it against the spot price yourself rather than take the dealer's word for it. Our heating oil, buy now or wait entry weighs the timing side of this same decision. You can run your own numbers through our fuel cost calculator before you sign anything.
See what a fixed price versus staying on the market price would mean for your own numbers.
Run the calculator6. What this term does not mean
A fixed price contract is not a wager on where oil prices are headed, and it is not the same thing as a budget or instalment plan. A pre-buy or cap price fixes what you pay per unit of fuel; our budget plan and instalments entry covers a separate product that only spreads a bill you would have paid anyway across monthly payments, with no effect on the underlying rate.
A second misconception is that locking in a price also locks in supply, in the sense of how many days you can run before the next delivery; our days of supply entry covers that separate, physical measure of how long your tank or a region's inventory lasts. A third, and the one this page corrects most directly: outside the New Hampshire example above, no insolvency protection for prepaid heating oil was documented in the sources reviewed for this page, in either direction. For Germany, the Verbraucherzentrale describes a customer of a failed company as an ordinary unsecured creditor; for every other market here, the position is simply not documented, which is itself a reason to ask before prepaying rather than to assume either answer. That is a risk worth weighing against the size of any pre-buy order, a topic our partial fill and order size entry also touches from the volume side.