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Trusted by over 500,000 customers for 20+ years
Order online or call
01480 775454
Sign in
Trusted by over 500,000 customers for 20+ years
Written by
Shaun Curtis
on 05 Sep 2022
and updated on
02 Apr 2026
Categorised in
Tips and Advice
If you're installing a new oil storage tank, whether it's a replacement for an old one or for a new build, chances are the conversation will turn to 'what size oil tank' you need.
Oil storage tanks come in all shapes and sizes and can be plastic or metal, single-skinned or double-skinned, and designed for domestic and commercial buildings. So, deciding which type and size of oil tank you need can be a bit of a conundrum. Let's bring some clarity to the situation.
There are different oil storage tanks to suit different requirements, but the first thing to mention is that you need to make sure it has been manufactured in accordance with OFTEC standards:
You may also find it is mandatory to have a bunded oil tank (double-skinned) if it is going to be sited near any controlled water system, such as a river or a well.
Generally, oil tanks last for around 20 years, as long as they are serviced annually by an OFTEC registered engineer. They will be able to advise you if you need to replace your oil tank. Your oil supplier may also notify you of any issues, such as a leaking valve, and may refuse delivery if there are any safety concerns.
Before deciding on the size of oil tank you need, consider the following:
For example, a one-bedroom property would typically be well served by a 1,000-litre oil tank, providing more than enough capacity for standard usage. In contrast, larger homes with four or more bedrooms may require a tank of 2,000 litres or more to meet higher demand.
This is often linked to bedrooms, but not always. For example, a couple sharing one bedroom may still need at least a 1,000 litre tank, while children sharing rooms can increase overall usage. If you're unsure, it's usually best to opt for a slightly larger tank, provided space allows.
Estimating how much oil you use can be difficult until you've lived in the property for a full year, as consumption often varies significantly between summer and winter. If possible, it's helpful to ask previous owners about their usage or review past delivery records to get a better idea.
At many properties, the space available determines the size of the tank that can be installed. Most domestic oil tanks in the UK are positioned outdoors, although they can be placed underground or inside a building or basement. However, these alternative installations must comply with strict environmental regulations and often require specialized equipment.
Most domestic properties in the UK have oil tanks between 1,000 litres and 2,500 litres.
It's important not to choose a tank that is larger than necessary. If a household typically uses 500 - 1,000 litres per year, installing a significantly larger tank can create avoidable issues.
These include higher servicing costs, oil being stored for longer periods, and an increased risk of sludge or contamination affecting the heating system.
Selecting an appropriately sized tank helps maintain efficiency and reduces the risk of maintenance problems.
When installing or replacing an oil tank, it's important to choose a safe and suitable location. The tank should be positioned well away from any sources of heat or fire.
As a guide, it should be:
This spacing helps reduce fire risk and ensures the tank can be safely accessed and maintained.
You'll also need to ensure there is enough access for oil deliveries, as well as space for engineers to carry out servicing and maintenance. The tank should be protected from extreme weather conditions and installed on a strong, level base, such as concrete, to ensure stability and longevity.
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