Steel oil tanks vs bunded plastic tanks
Bunded plastic tanks have an integral outer skin designed to contain a leak from the inner tank, which is now the standard specification for most new domestic oil storage. Steel tanks, particularly older single-skin versions, can corrode from the inside or outside over time and generally need a separate bund structure if not already double-skinned.
Understanding steel and bunded plastic oil tanks before you spend money
Modern bunded plastic tanks resist the rust and corrosion that eventually affects steel, and their integral bund satisfies the containment requirement common near watercourses or boundaries without a separate wall being built. Steel tanks remain in service across many older properties and can perform well if inspected regularly for corrosion, but replacement is usually with a bunded plastic tank once condition or siting compliance becomes a concern.
Steel and bunded plastic oil tanks: engineer's shortlist
- Bunded plastic tanks include integral leak containment as standard
- Steel tanks are prone to corrosion, particularly at welded seams
- Siting near boundaries or watercourses often requires bunding
- Older single-skin steel tanks are increasingly being replaced
- Tank capacity and siting distances follow OFTEC guidance in both cases
Where we deal with this
Relevant registrations
- Gas Safe registered for domestic gas boiler work
- OFTEC registered for oil boiler work
- Worcester Bosch Accredited Installer
Straight answers on steel and bunded plastic oil tanks
Our advice: Bunded plastic is now the practical default for new installs; older steel tanks simply need closer, regular inspection.
Jamie Crawford Heating is based at 24 Bristol Road, Radstock, BA3 3EE.
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Questions we get asked
- Is my old steel tank still safe to use?
- It should be inspected regularly for corrosion; visible rust, weeping seams or pooling oil are reasons to plan replacement.
- Do all new tanks have to be bunded?
- Most siting situations require bunding, though the exact requirement depends on proximity to boundaries and watercourses.
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