How Do Bunded Oil Tanks Work?

Introduction

Bunded oil tanks are essential for safe and compliant oil storage, especially in the UK. Understanding how these tanks function is important for homeowners and businesses alike. In this post, we’ll explain the dual-layer system of bunded oil tanks, highlight their environmental benefits, and outline the regulations that govern their use. We’ll also look at typical installations and why bunded tanks are a superior choice compared to single-skinned models.

What Are Bunded Oil Tanks?

Bunded oil tanks consist of two layers: an inner tank and an outer bund. The inner tank holds the oil, while the outer bund acts as a secondary containment system to capture any leaks or spills. This design significantly reduces the risk of environmental contamination.

Because of this added protection, bunded oil tanks are often required by law in the UK. In fact, government guidance on oil storage clearly states that fixed oil tanks must include bunding, and the bund itself must hold at least 110% of the tank’s capacity.

Benefits of Bunded Oil Tanks

• Environmental protection – Prevents leaks that could contaminate soil and waterways.
• Regulatory compliance – Meets strict UK requirements for oil storage.
• Cost efficiency – Helps avoid fines or costly clean-ups linked to spills.
• Safety – Provides an extra layer of security against leaks or damage.

How Do Bunded Tanks Work?

The principle is straightforward. The oil sits in the inner tank. If the inner tank fails, the outer bund contains the oil and prevents it from escaping into the ground. This simple but effective design makes bunded tanks one of the safest ways to store heating oil.

Common Installations

You’ll find bunded tanks in many different settings, including:

• Residential properties for home heating.
• Commercial facilities that rely on stored fuel.
• Agricultural sites where large volumes of oil or diesel are kept.

For practical examples of installation layouts and requirements, visit our News & Insights blog hub.

Regulations in the UK

Bunded oil tanks are subject to strict environmental and building regulations. The Control of Pollution Regulations and Approved Document J of the Building Regulations set out clear rules around bund capacity, siting, and installation standards. For example, domestic tanks above 2,500 L must include a bund, and all tanks should be installed on a solid, non-combustible base with enough clearance from nearby structures.

You can review these rules in detail by visiting the heating oil storage regulations in the UK. Following these requirements ensures your system is safe, efficient, and compliant.

Choosing the Right Bunded Oil Tank

When selecting a bunded oil tank, consider:

• Capacity – Match the size of the tank to your usage needs.
• Material – Decide between plastic and steel, depending on site conditions.
• Location-specific rules – Check whether additional regional or environmental regulations apply.

To explore different models and capacities, browse our full Bunded Oil Tank Collection.

To Wrap Up

Bunded oil tanks provide essential protection for homes, farms, and businesses. Their dual-layer design prevents leaks, keeps you compliant with UK regulations, and reduces the environmental risks associated with oil storage.

Whether you’re upgrading an old single-skinned tank or installing new, choosing a bunded tank gives you peace of mind and long-term security.

Ready to take the next step? Visit our Bunded Oil Tank Collection today and find the right solution for your property.