An Expert Guide to Heating Oil Storage

Tuffa bunded heating oil tanks

Read An Expert Guide to Heating Oil Storage for information, advice and industry insights covering everything from the basic question “what is heating oil?” to the money-saving “how can I get the best price for heating oil?”. What makes us experts? We’ve been manufacturing oil tanks for over 30 years and in that time we’ve gathered a huge amount of knowledge which we are now sharing with you in this one-stop expert guide.

You can also download the PDF version by clicking on the image below.

Tuffa Tanks - Expert guide to Oil Tanks

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What is heating oil?

What are heating oil storage tanks used for?

What are the advantages of using heating oil?

What are the disadvantages of using heating oil?

What types of heating oil storage tanks are available?

What size heating oil storage tank do I need?

When should I buy heating oil?

How do I get the best price for heating oil?

Which heating oil storage regulations apply to me?

How do I check and maintain my heating oil storage tank?

What do I look for in a new house with a heating oil storage tank?

How do I prevent fuel theft?

What is heating oil?

Heating oil is a liquid fuel used in boilers and furnaces for heating and/or cooking in domestic and commercial settings. Kerosene is a by-product of crude oil is the most common heating oil in the UK. However, with strict emission targets looming, fossil fuels are being phased out and it looks increasingly likely that biofuels like HVO will play a part in decarbonising UK heating.

Hydrotreated Vegetable Oils (HVO)

While the vast majority of UK homes currently run on kerosene, carbon emission targets and government legislations such as the “Clean Growth Strategy” (2017) will phase out high carbon fossil fuels – such as kerosene -for heating. HVO is currently commercially available in the UK as a biodiesel but is being trialled as a drop-in replacement to kerosene. The biofuel benefits from being a fossil-free, sustainably produced, and a renewable paraffin derived from waste such as used cooking oil and vegetable oil. While the government is backing low carbon solutions such as air source heat pumps, the oil industry is levying for HVO to be recognised and incentivised as a low cost and simple solution to reduce carbon emissions. Find out more about HVO in our article HVO Heating Oil – a Drop-in Alternative to Kerosene? Or, for more about the benefits of HVO and its use as a low-carbon alternative to diesel then view our Expert Guide to HVO Fuel Tanks.

What are heating oil storage tanks used for?

Heating oil is generally used as an alternative to gas in properties that are not connected to the national gas network. Oil tankers deliver the oil to heating oil storage tanks for transportation to boilers and furnaces where the fuel is ignited. Uses vary between domestic and commercial applications.

non-domestic heating oil tank
Large steel oil tank at an NHS site

Domestic heating oil

Usually heating oil is used to fuel a boiler for hot water and central heating. Around 1.5 million properties in the UK use oil for home heating. Although it’s less common, heating oil can also be used for cooking in oil-fired Agas.

Commercial heating oil

In a commercial setting, heating oil is used to fuel machinery for construction, agriculture and horticulture. It can also be used to fuel furnaces, generate electricity, produce steam for industrial machinery, and heat commercial buildings including holiday homes.

What are the advantages of using heating oil?

While for most homeowners using heating oil is more of a necessity than a choice, there are still definite advantages:

  • Heating oil actually burns hotter than gas and warms a house quicker than gas or electric-powered heaters.
  • HVO is a low-carbon alternative to gas heating. Unlike heat pumps, HVO can be used effectively in homes with poor EPC ratings.
  • Heating oil is the cheapest alternative to gas at a cost of around 5.5 pence per kWh. Comparatively gas is 5.1 pence per kWh and electricity is 20.7 pence per kWh. (NottEnergy 2019)
  • Modern heating oil systems are more efficient than gas or electric meaning that less fuel is wasted and more fuel is converted into heat. Heating oil furnaces exceed 90% efficiency whereas gas heating furnaces is around 75% and electric 30%.
  • Heating oil gives you much more control of your fuel supply. You can choose when you want to fill your heating oil storage tank, who fills it, who supplies it, and you can shop around for the best deals.
  • Most heating oil suppliers give you the option of paying monthly making your heating payments the same as if you were paying for gas.

What are the disadvantages of using heating oil?

  • Prices for heating oil fluctuate and you may have to spend time to get the best deal. However, this can work to your advantage.
  • Heating oil requires delivery which can be inconvenient compared to gas.
  • Kerosene is a fossil fuel and is therefore non-renewable and has a higher carbon output. However, HVO is a low-carbon alternative to kerosene and avoids these issues.

What types of heating oil storage tank are available?

Heating oil storage comes in a variety of types and sizes with different capacities suitable for domestic and commercial applications. They can be manufactured in steel or plastic (polyethylene), and are available in single skin or bunded. Tuffa Tanks are also the only UK manufacturer of steel and plastic Fire Protected Oil Tanks. These are factory-fitted with an integral fire rated material enabling compliant installation adjacent to buildings and boundaries or even inside.

You can find out the differences between these tanks and the benefits of each below:

Single skin heating oil tank

Single Skin Oil Storage Tank
Single skin heating oil tank – 1400 litre

Single skin oil tanks have a single layer of steel or plastic. The reduced manufacturing costs in producing a single layer of material makes this tank the cheapest of all the options. However, single skin oil tanks are subject to stricter regulations as oil spills risk polluting land and water sources. Therefore, new heating oil storage tank installations sited near water sources or with a capacity to store over 2,500 litres in capacity are required to be bunded. Bunded oil tanks are also a requirement for commercial installations and new installations in Wales.

Bunded heating oil tank

Bunded oil tanks have two layers – an inner tank and an outer tank (bund) which acts as a secondary containment (a tank within a tank). Regulations state that the bund must be able to hold at least 110% of the contents of the inner tank. In the event of a leak, the outer tank will contain the oil which would otherwise risk contaminating the local area. Having a bund is a usually a requirement for any new oil tank installation with a capacity to hold more than 2,500 litres.

Fire protected oil tank

Integrally fitted fire protected oil tanks contain a flame-retardant material offering 30 or 60 minute fire protection. This is a requirement under British Standards for oil tanks located near buildings and boundaries or even inside. The fire rated material is designed to allow sufficient time to evacuate the area while a fire is controlled and extinguished. Find out more info on our Expert Guide to Fire Rated Oil Tanks.

steel bunded heating oil storage tank
Steel bunded heating oil tank – 900 litre


Steel oil tanks can be single skin or bunded and bunded tanks can be fitted with fire protection. Usually steel tanks are made to order meaning they can meet bespoke requirements, capacities and dimensions. This makes steel tanks popular with people who are replacing old tanks as they can sit inside the same space. Steel tanks are more expensive than plastic tanks but they offer greater durability with a designed life expectancy in excess of 30 years.


Plastic oil tanks can be single skin or bunded and bunded tanks can be integrally fitted with fire protection. The plastic used is a polyethylene, a recyclable material known to be extremely hard-wearing. Our plastic tanks are roto moulded which makes a single unit without seams or joints which can create weak points. Tuffa’s bunded plastic tanks have a designed life expectancy of 20 years or more and are a cheaper alternative to steel oil tanks.

Manufacturing and Quality Standards

All heating oil storage tanks should meet British Standards and trade association standards. At a minimum, tanks need to comply with BS EN ISO 9001, should be made of a material suitable for the oil stored with sufficient strength to ensure it won’t burst or leak with ordinary use and are expected to last at least 20 years with proper maintenance. Rotationally moulded polyethylene tanks must also meet BS EN 13341 standards and be CE marked to indicate conformity with health, safety and environmental protection standards. Steel tanks must meet BS 799 standards. Your manufacturer, supplier, or installer should advise you on whether a tank meets these standards.

What size heating oil tank do I need?

As a rule of thumb, we recommend that domestic heating oil tanks have a capacity of at least 500 litres per household bedroom. However, there are cost advantages to getting a larger tank than necessary. Use the table below to find Tuffa manufactured tanks suitable for your usage:

How much heating oil will I use?

The amount of heating oil you use depends on the usage: the size of the house, how often you’re at home and whether it’s used for heating, cooking or both. However, to get a basic idea of heating oil consumption, a typical three bedroom household using kerosene for heating only, and mostly on weekends and evenings, will use around 1,600 litres of oil annually. Using kerosene for heating and cooking will bring that up to 1,750 litres annually.

When should I buy heating oil?

Kerosene prices vary dramatically so doing researching the best time to purchase and shopping around to get the best price is well worth the time spent. The graphs below highlight just how much money can be saved on heating and cooking bills if kerosene is purchased at the right time.

Average price of kerosene by month

The monthly price of kerosene suggests that purchasing your oil during the summer months could save you around £30 per 1000 litres with June to August being the best time to buy and September or February the worst.

Price of kerosene over 10 years

When we look at the price of kerosene over 10 years we can see that there is a huge overall variance in fuel prices even in the same month; the cost of 1,000 litres of heating oil in February 2021 was just £466 compared with February 2022 at £696 – that’s £230 or around 50% more. This variance occurs because the price of heating oil is dependent on a whole range of factors from exchange rates to conflict in oil producing countries, and crude oil prices. Here we see the lack of demand for oil caused by COVID-19 reducing prices in 2021, while in 2022 tensions with Russia has increased prices dramatically.

How do I get the best price for heating oil?

While purchasing fuel at the right time is important, it isn’t the only way you can get the best price for your heating oil. While gas and electric companies tie you into long-term contracts with a single supplier, heating oil does not require a contract – although you can choose to pay monthly. This means that when it comes to refuelling your tank you can compare heating oil prices from different suppliers and pitch competitors against each other.

Another way you can reduce the price of your fuel is by joining a “heating oil club” – communities of people who have banded together to buy their heating oil in bulk to lower the overall cost and get a better deal for each member of the community.

heating oil club
Join a heating oil club and save by bulk buying with others

Our top tip for getting the best price on heating oil is buying the biggest oil tank you can practically keep. The cost difference between a small 1,350 and a larger 2,500 litre heating oil tank is fairly minimal. However, the additional 1,150 litre capacity can provide you with substantial savings if you buy at the right time.

The larger the tank you have, the more you can save by bulk buying heating oil when the prices are low. Also, most heating oil suppliers will offer you incremental discounts when you purchase a large amount of fuel. Normally purchasing 500 litres will give you a standard rate with a small discount for every 100 litres above 500 litres that you purchase. Of course, bulk buying reduces the number of deliveries required per year – a service that always charges even if the costs are hidden. Finally, this tactic allows you to store more fuel, with the ideal scenario being purchasing enough oil during the summer months to last you through the winter months when you need heating the most but fuel prices are the highest.

Which heating oil storage regulations apply to me?

Everyone storing oil in a container with a capacity to store over 200 litres must follow oil storage regulations. The regulations you are required to follow depends upon the usage of the tank and its location – both the proximity of the tank in relation to other structures and the country in which the tank resides. Read on to find out which regulations apply to you.

Domestic oil storage regulations

The England Control of Pollution (Oil Storage) Regulations (2001) state that an oil tank is considered domestic if it has a capacity of 3,500 litres or under and it’s used to heat a domestic building e.g. the primary use can’t be for commercial purposes. New domestic oil tank installations in England with a capacity under 2,501 litres aren’t required to have a bund unless it’s sited in any of the following places:

  • Where oil spills could run over hard ground and reach coastal waters, inland fresh waters or a drinking water source.
  • Where oil spills could run into an open drain or a loose manhole cover.
  • Where the tank vent pipes cannot be seen when the tank’s being filled, for example, because the delivery tanker is parked too far away.
  • Within 10 metres of coastal waters or inland fresh waters like lakes or streams.
  • Within 50 metres of a drinking water source, for example, wells, boreholes or springs.

While in these circumstances a bund isn’t compulsory, we still recommend bunding all tanks as good environmental practice. Additionally, not all insurance companies accept single skin tanks and you will face the risk of regulation updates making your tank no longer compliant.

Commercial oil storage regulations

Commercial oil storage regulations must be followed if your business (including marinas and public sector premises) stores oil in a tank with a capacity of 201 litres or higher, or if your domestic premises stores oil in a tank with a capacity over 3,500 litres.

If your oil tank falls into this category then your tank must contain a secondary containment to reduce the risk of spillages. This secondary containment usually takes the form of a bund – an outer layer capable of holding at least 110% of the inner tank’s capacity. This bund can be constructed from masonry or concrete, or can be ‘integrally bunded’.

Tuffa’s oil tanks are integrally bunded meaning that the bund is fitted during the manufacturing process.

Wales, Scotland and Northern Ireland

With an increased focus on protecting the environment oil storage regulations are becoming increasingly strict and regulations in Wales now require all new oil tank installations with a capacity of over 200 litres to be bunded. All new oil tanks installed in England, Scotland and Northern Ireland must be bunded when the tank has the capacity to store above 2,500 litres in capacity.

To find out more about oil storage regulations in your country click on the appropriate link:

England – Control of pollution (oil storage) regulations 2001

Wales – Control of pollution (oil storage) regulations 2016

Scotland – The Water Environment (Controlled Activities) Regulations 2011

Northern Ireland – Control of pollution (oil storage) regulations 2010

Do I need a bunded oil tank?

Whether you require a bunded oil tank depends on four factors:

  • The location of the tank and proximity to water sources.
  • The country the oil tank is sited in.
  • The capacity of the tank.
  • The usage. Note that heating oil tanks used for farmhouses count as domestic usage.
do i need a bunded oil tank?

Building regulations – fire separation distances

As well as oil storage regulations, heating oil tanks that are connected to a furnace or boiler must also comply with building regulations. These regulations state fire separation distances – minimum distances that your heating oil tank must be from boundaries and structures. These regulations are in place to reduce the risk of fires igniting the kerosene. Under these regulations your tank cannot be located:

  1. Within 1.8m of a non-fire rated building or structure.
  2. Within 760mm of a non-fire rated boundary.
  3. Within 1.8m of non-fire rated eaves.
  4. Within close proximity to a balanced flue.
Building regulations – fire separation distances

The base of a tank must be solid enough to support the weight of the tank with a wide enough perimeter to act as a barrier from foliage or anything else which can carry a fire. Regulations state that a tank must be sited on a hard, non-combustible surface of an appropriate thickness. For domestic installations we recommend:

  • Concrete at least 100mm thick
  • Paving stones at least 50mm thick positioned close to each other on level ground
  • Stonework at least 50mm thick

Want to site your tank next to or even in a building?

If you are struggling to comply with these regulations, or you simply wish to hide your tank, then you can use a fire-rated barrier to store a heating oil tank adjacent to or even in a building.


With a 30 minute fire protected oil tank your domestic heating oil tanks can be sited adjacent to buildings and boundaries including your home, shed, garage and trellis.

Illustration of a fire rated oil tank with 30 minute protection

With a 60 minute fire protected oil tank your domestic heating oil tank can be sited within an uninhabited building.


Commercial heating oil tanks and tanks with a capacity above 3,500 litres require at least 60 minute fire protection to site a tank adjacent to a building.

How do I check and maintain my heating oil storage tank?

Oil tank maintenance is the responsibility of the homeowner in domestic properties. Oil spills and leaks are detrimental to the environment and the charges for cleaning contaminated land can be extremely costly.

Checking your oil tank

It’s recommended that you check your oil tank intermittently every 6 months and after any episodes of extreme weather. Some of the visible signs you should look for on the tank include:

  • Cracks and splits
  • Rust
  • Bulging
  • Faulty gauges
  • A sudden increase in oil usage
  • A stronger smell of oil

If you notice any damage then have it repaired immediately. You should also check the base for subsidence and ensure that there is no foliage within a close range of the tank.


As well as checking your oil tank every 6 months we recommend that you use a competent technician to maintain your tank every year. Your technician should check the tank, bund and pipework and remove any condensation water. Upon completion, you should receive a written report on the state of the tank and any work done. This service can be performed by members of Oil Firing Technical Association (OFTEC) or the Association of Plumbing & Heating Contractors (APHC).

Cleaning your oil tank

Condensation inside tanks causes sludge which can clog fuel lines and filters. However, by making sure your oil levels don’t get too low you can reduce the chance of sludge being able to enter the fuel lines. It’s often the fuel delivery technician who notices the build-up of sludge and they may be able to advise you on when to clean your tank. However, we recommend you clean an oil tank roughly every five years to keep it in good working order and to prevent oil contamination.

Tank cleaning is performed by a professional tank cleaning service as without the professional tools it’s a laborious and complicated job and will likely lead to spills.

What should I do with oil spillage and what insurance do I need?

Oil spills from your tank can be caused by cracks, splits, over-fueling, theft and human error. Spilt oil will contaminate the earth and can reach ground water causing pollution and damaging the environment. This can also be very costly to clean up and requires appropriate insurance.

Oil spills

To reduce any impact to the environment that oil spills have it’s important you keep a spill kit near the tank containing commercial sorbent products, sand and earth. In the event of a spill you should take immediate action and soak up the spilt oil with contents of your spill kit. If the spill is likely to reach waterways then you should report the environmental incident on the 24-hour emergency hotline 0800 80 70 60.


As well as properly maintaining your oil tank you should check your home insurance to ensure it covers you for cleaning up oil spills. Make sure your policy covers you for:

  • Expenses for cleaning up oil on your own property.
  • Environmental cleanup for accidental oil loss.
  • Liability expenses to cover neighbouring land and boreholes.

What do I look for in a new house with a heating oil storage tank?

Viewing or buying a new house and discovering that it’s heated an oil-fired boiler can be alarming for those not familiar with liquid heating. However, there is no reason that it should put you off buying a house. Check out the diagram below to familiarise yourself with the layout of a heating oil tank.

Bunded heating oil tank
A typical set up of a bunded heating oil tank

As you would do before moving into any new property, it’s worthwhile doing a few basic visual checks to ensure everything looks okay:

  • Check the condition of the heating oil tank looking for any signs of deterioration – look at the “Checking your oil tank” section in the previous chapter to find out what to look for. You can expect a tank to have a few minor scrapes but if there are any signs of leaks and cracks then you will need a new tank – this might affect how much you offer on the house.

  • Perform a basic check to see if the heating oil tank is obviously in breach of building regulations regarding fire separation distances. Basically, the tank should be 1.8m away from most boundaries and buildings and should be sited on a solid concrete base which extends 300mm past the outer edges of the tank. If that’s not the case then ask for the tank’s paperwork to see if it’s fire protected (and can therefore legally be sited near boundaries and buildings).
  • Check the condition of the boiler and any visible pipes.
  • Check the fuel level gauge to ensure you have heating oil ready for when you move in – delivery can sometimes take a week or two so book early or be prepared with alternative heating.
  • Be sure to read the rest of this guide to familiarise yourself with heating oil and to get the best price for kerosene.

How do I prevent fuel theft?

With domestic heating oil tanks capable of holding well over £1,000 worth of kerosene it’s no great surprise that oil tanks are a target for thievery. To add insult to injury, heating oil theft can also lead to spillages, an uncomfortable phone call to the environment agency and the possibility of clean-up fees. This is a real problem in the UK and in 2018 there were over 25,000 confirmed fuel thefts equating to losses of over £1.75m. The best way to stop theft is to prevent thieves from even trying to steal from your tank. However, if that fails it’s always worthwhile having additional protection on your tank.

plastic heating oil tank


Preventing fuel theft usually involves installing glaringly obvious visual deterrents to stop thieves from targeting you. Or, simply hide your fuel tank away so thieves don’t know you have one.

On the cheaper end of the visual deterrent scale, you can install motion-detection security lighting which alerts you to a presence in your property and is often enough to discourage intruders. With a little extra money, you can install CCTV (or even dummy CCTV) placed in a position where intruders can see they are being filmed but can’t reach the camera. Visual deterrents are also a great way to let intruders know they are dealing with someone who is security conscious – this is often enough to make thieves choose an easier target.

The location of the oil tank itself can help to reduce fuel theft – if you can’t see the tank from the road then most people simply won’t know it’s there. Obstacles such as sheds, fences, trellis and foliage can be used to ensure tanks aren’t visible from the road. Hiding a tank is made more achievable with integrally fitted fire protection oil tanks as they allow you to site your tank next to or even inside buildings. Internally sheltered tanks or tanks screened from above have the added benefit of making your oil tank impossible to see from Google’s satellite images – a tool that criminals are known to use while locating valuable items in people’s properties.


As well as simply preventing heating oil theft, there are products available which can physically protect your tank or alert you when theft is occurring. Also, if you are looking to purchase a new heating oil tank then it’s worthwhile considering which type of tank offers the most protection.

Lockable lid

Some heating oil tanks (including our bunded and fire protected ranges) are equipped with a lockable lid which can be fitted with a padlock. This offers the fill points protection from siphoning. We recommend using round-shackle padlocks as they leave little room for bolt cutters to grip the lock and because they are not spring loaded they will not unlock if the key barrel is drilled into.

bunded heating oil tank
Lockable lid on our 2500 litre bunded tank

Lockable fill points

The easiest way to steal heating oil is to siphon it from a fill point or inspection hole in the tank. If your tank doesn’t have a lockable lid then tank arms (which acts like a steering wheel lock) and security locks can be used instead to offer extra protection to these vulnerable points.

Tanks alarms

A tank alarm such as a Watchman Alarm is used to alert you when there is a sudden drop in oil in your heating oil tank. A leak in your tank or someone stealing fuel will trigger an alarm in the monitor which can be fitted inside your house or office.

Steel tanks

Unsurprisingly steel is more difficult to penetrate than plastic and often tools are required to drill into the tank which can alert tank owners. Comparatively, plastic is easier to penetrate and makes much less noise when being drilled. There have even been reports of thieves heating metal rods to melt holes into plastic tanks. These factors also make steel tanks a less attractive target than their plastic counterparts.

Bunded tanks

Bunded oil tanks make stealing fuel more complicated as thieves have to penetrate both the outer tank and inner tank. They also often come with lockable lids which hide fill points.

kerosene tanks
All of our oil tanks come with a 10-year guarantee when registered

If you have any more questions about heating oil storage tanks, or if you would like to enquire about prices, then please contact our sales team on 01889 567700, by emailing [email protected] or complete the enquiry form below.

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