Heating Oil Types in the UK: A Complete Guide

Heating oil is a vital energy source for more than 1.5 million households across the UK, particularly in rural or off-grid areas without access to the mains gas supply. It is used to fuel boilers and central heating systems, providing reliable warmth during colder months. However, not all heating oil is the same. There are different types of heating oil available, each suited to specific needs and systems.

This article explains the main heating oil types used in the UK and their benefits, helping homeowners and businesses make informed choices.

1. Kerosene (28-Second Oil)

Kerosene is the most common type of heating oil used in UK homes. It is a clear, thin, and highly refined fuel designed to burn cleanly and efficiently.

Key Benefits:

• Clean-burning: Produces minimal soot and carbon deposits, which helps maintain boiler efficiency and extends the systems lifespan.

• Efficient: Works well in modern condensing boilers and range cookers, such as AGAs and Rayburns.

• Cold-resistant: Its low freezing point makes it suitable for winter use.

• Cost-effective: Offers good value due to high energy output and lower maintenance needs.

Premium kerosene is also available. It includes additives that improve combustion, prevent sludge build-up, and protect the heating system. Though it costs slightly more, premium kerosene can reduce boiler servicing and fuel consumption over time.

2. Gas Oil (35-Second Oil)

Gas oil, commonly known as red diesel, is a heavier and less refined heating fuel. It is dyed red to show that it is a rebated fuel and not permitted for use in road vehicles.

Uses and Features:

• Mainly for commercial or agricultural use: Ideal for generators, machinery, and commercial boilers.

• Occasionally used in domestic settings: Some older heating systems still operate on gas oil.

• Less efficient than kerosene: Produces more soot and carbon build-up, which can lead to more frequent maintenance.

• Higher environmental impact: It is being phased out for domestic use due to its emissions and lower efficiency.

For most homes, gas oil is not recommended unless the existing system specifically requires it.

3. Hydrotreated Vegetable Oil (HVO) The Future of Heating Oil

With increasing focus on reducing carbon emissions, renewable alternatives like Hydrotreated Vegetable Oil (HVO) are gaining attention. HVO is a synthetic diesel made from waste vegetable oils and animal fats.

Advantages:

• Lower emissions: Reduces greenhouse gas emissions by up to 90%.

• Renewable: Made from sustainable waste sources.

• Compatible with many existing boilers: Minor system adjustments may be required.

• Cleaner burning: Produces less soot and extends boiler life.

Although HVO is currently more expensive and not yet widely available, it offers a promising path toward eco-friendly home heating.

Conclusion

Understanding the different types of heating oil available in the UK helps homeowners choose the best option for their needs. Kerosene remains the most efficient and widely used fuel for domestic heating. Gas oil is typically reserved for older systems or commercial use, while HVO presents an exciting low-carbon alternative for the future. As the UK transitions to greener energy, staying informed will help ensure both comfort and sustainability in your home.