Choosing the Best Bunded Oil Tank for Home Heating

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We’re often asked what the best bunded oil tank for home heating oil is. Every property is different, but this guide will help you assess your oil storage needs and choose the most suitable oil tank for your home and heating system.

What Size Should My Oil Tank Be?

According to OFTEC guidelines, your oil tank should hold enough fuel for a year’s supply. In practice, most homeowners prefer smaller capacities that fit their space and usage. A simple rule of thumb is 500L per bedroom plus 500L. You should also consider any additional heating demands, such as an oil-fired range cooker like an AGA or Rayburn, which typically uses around 7L of oil per day (approximately 2500L per year).

For convenience, you can install a remote fuel gauge to monitor oil levels easily from indoors.

Typical Oil Tank Sizes by Property

Oil Tank Size and Typical Property
CapacityTypical PropertySlimline TanksVertical TanksHorizontal Tanks
650L–1000L1–2 Bedroom House, Holiday Cottage, Park HomeDeso SL650BT
Harlequin 650HQI
Deso SL1000BT		––
1000L–1550L2–3 Bedroom House, Small Commercial PropertyDeso SL1250BT
Deso SL1400BT		Atlantis V1340BT
Harlequin 1450HQI		Harlequin 1400HQI
1650L–2500L3–4 Bedroom House, Commercial Premises, Village HallTitan ESSL2000Deso V2455BT
Titan ESV2500		Harlequin 2000HQI
Deso H2500BT
Over 2500LLarger Homes, Schools, Commercial Buildings–Tuffa 3500VB
Tuffa 6000VB		Harlequin 3500HQI

Oil Tank Shapes and Materials

Slimline tanks are narrow, ideal for properties with limited access or tight spaces. Vertical tanks offer the best value per litre and suit corners or compact spaces, while horizontal tanks are perfect for larger gardens or replacing older steel models.

Most domestic tanks are made from high-quality MDPE (medium-density polyethylene). Plastic bunded tanks have a seamless inner layer and a secondary containment bund to meet environmental safety standards. For heavy-duty or bespoke installations, steel bunded tanks are also available.

Oil Tank Regulations and Standards

All UK tanks should include a Declaration of Conformity and CE marking (EN13341). OFTEC-approved tanks carry an OFCERT number and comply with OFS T100 (plastic) or OFS T200 (steel) standards. Always buy from trusted manufacturers listed on the OFTEC-approved register.

Bunded vs Single-Skin Tanks

Bunded tanks include a protective outer layer that prevents leaks and environmental damage. They’re required in most domestic and commercial installations, especially near watercourses or hard ground. Single-skin tanks are only suitable when an external bund is already in place, and while cheaper, they pose higher contamination risks.

Installation and Regulations

Installing an oil storage tank isn’t a DIY job. It must comply with building regulations and OFTEC standards. Always use a registered technician qualified under the OFTEC 600A scheme. Some installations may require planning permission, particularly in conservation areas or near public highways. When in doubt, check with your local authority.

Our Recommended Bunded Oil Tanks

ModelWhy We Recommend ItDimensions
CLA1000Slim and compact — ideal replacement for older 300-gallon tanks or narrow access spaces.Length 1.9m
Width 0.65m
Height 1.4m
SL1250BTCompact yet high-capacity design with narrow 650mm width — perfect for tight installations.Length 2m
Width 0.65m
Height 1.66m
H2500BTSquare design with galvanised steel frame for maximum strength — compact 2500L tank for larger properties.Length 2.3m
Width 1.25m
Height 1.45m

Frequently Asked Questions

1. Do I need a bunded oil tank?

Yes, in most cases. If your tank is over 2500L or near drains, streams or hard surfaces, a bunded oil tank is legally required for environmental safety.

2. What’s the difference between plastic and steel bunded tanks?

Plastic tanks are lighter, corrosion-resistant and ideal for domestic use. Steel tanks offer increased durability and can be built to bespoke sizes for commercial applications.

3. Can I install my own heating oil tank?

No. Installation must be carried out by a competent person, typically an OFTEC-registered engineer, to ensure compliance with safety and building regulations.

4. How long does an oil tank last?

With proper installation and maintenance, a quality bunded oil tank can last 15–20 years or longer. Regular inspections help extend lifespan and prevent leaks.

5. Do I need planning permission for a new oil tank?

Usually not, unless the tank exceeds 3.5m in height or is closer to a public highway than the main building. Always check with your local planning authority for confirmation.

Still not sure which bunded oil tank is right for your property? Call our friendly team on 01722 442446 or use our contact form for expert advice.