Oil-fired Agas and Rayburns are the heart of many rural homes, providing cooking, space heating, and hot water from a single appliance. But they are also significant fuel consumers. Understanding what they burn, how much they use, and how to manage costs is important for anyone running one.
Oil-fired Agas and Rayburns run on 28-second kerosene: the same fuel as a standard oil boiler. A traditional two-oven Aga running continuously uses around 4 to 5 litres per day, or 1,500 to 1,800 litres per year. At current prices that is roughly £1,650 to £1,980 per year in fuel costs for the Aga alone.
Oil-fired Agas and Rayburns burn 28-second kerosene, also known as C2 grade kerosene, Class C2, or simply heating oil. This is exactly the same fuel used in a standard domestic oil boiler. You do not need a special grade or additive: ordinary kerosene from any supplier is correct.
Some older models were designed for 35-second oil (gas oil), but this is now rare in domestic installations. Check your appliance manual if you are unsure. The vast majority of domestic Agas and Rayburns installed in the past 30 years run on 28-second kerosene.
Oil consumption varies significantly between models, age, and how the appliance is used. Here are approximate daily consumption figures for common models running continuously:
| Appliance | Daily consumption | Annual consumption | Annual fuel cost* |
|---|---|---|---|
| Aga 2-oven (traditional) | 4.5–5.0 L/day | 1,640–1,825 L | £1,800–2,000 |
| Aga 4-oven (traditional) | 6.5–7.5 L/day | 2,370–2,740 L | £2,600–3,000 |
| Rayburn 200 series (cooker only) | 2.5–3.5 L/day | 910–1,280 L | £1,000–1,400 |
| Rayburn 300/400 (cooker + heating) | 5.0–8.0 L/day | 1,825–2,920 L | £2,000–3,200 |
*Based on 110p/L for 1,000L orders. Actual costs depend on current prices and ordering volume.
These figures assume continuous operation. Many Aga and Rayburn owners run their appliance seasonally: switching off or to a low-temperature setting in summer: which reduces annual consumption significantly.
An oil-fired Aga running continuously is an expensive appliance to operate. At 110p per litre, a two-oven Aga costs roughly £5.00 to £5.50 per day in fuel: around £150 to £165 per month. The four-oven version costs more like £7.00 to £8.50 per day.
However, this cost covers not just cooking but also a significant contribution to space heating and domestic hot water in most installations. In a farmhouse or older rural property where the Aga is the primary heat source, comparing the all-in cost against an oil boiler plus electric cooker plus water heating gives a fairer picture.
Traditional Agas run at constant temperature 24 hours a day. Newer models: the Aga 7 series and some Rayburn variants: can be set to slumber or low-power modes overnight and in summer, reducing consumption significantly. If you have an older continuous-running model, an upgrade to a slumbering version typically pays back in fuel savings within a few years.
Many Aga owners shut their appliance down completely from April to September and use a separate cooker and water heater during the summer months. This can cut annual fuel consumption by 30 to 40% and is the single most impactful thing you can do to reduce costs if your Aga is not your primary summer heat source.
A well-serviced Aga runs more efficiently than a neglected one. The burner nozzle, filter, and combustion chamber should be cleaned and checked annually by an OFTEC-registered engineer. An inefficient burner can increase fuel consumption by 10 to 15%.
Because Agas consume oil year-round rather than just in winter, the opportunity to buy at summer prices is particularly valuable. A family running a four-oven Aga might order 2,500L in July at a summer price: saving £150 to £250 compared to ordering the same volume piecemeal through winter. Set a price alert on PriceTank for your target price and order a full tank when conditions are right.
Because consumption is high, Aga and Rayburn households benefit more than most from volume discounts. Ordering 2,000L at once rather than four orders of 500L each can save 5 to 7p per litre: around £100 to £140 per year at typical consumption levels.
Given the high consumption of an Aga, a larger tank is strongly advisable. A 1,000-litre tank will last only six to eight months for a two-oven Aga: meaning two orders per year and missing the opportunity to take a full summer order. A 2,500-litre or larger tank allows you to fill in summer and carry through the winter without running short.
See our guide to heating oil tank sizes for full capacity recommendations by consumption level.
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