
Fuel oil tanks, also known as heating oil tanks, are an integral part of a home heating system. They store the fuel required to keep a home warm and comfortable, especially during the colder months. These tanks are typically made of steel and come in various sizes, with the most common capacity being 275 gallons. Fuel oil tanks can be installed above or below ground, each option offering distinct advantages and considerations. For instance, above-ground tanks are more accessible for maintenance, while underground tanks save space and offer aesthetic advantages. Understanding the different types of fuel oil tanks, their maintenance, and safety measures is crucial for homeowners to ensure efficient fuel delivery and optimal performance.
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What You'll Learn

Fuel oil tank types: above-ground and underground
Fuel oil tanks are an integral part of any home heating system. They store the fuel that keeps your home warm and comfortable during the colder months. There are two basic types of fuel oil tanks: above-ground storage tanks (AST) and underground storage tanks (UST).
Above-ground storage tanks are installed above the ground, often in the basement of a home or outside. They are typically cylindrical or box-shaped and made of steel or fiberglass. They have a capacity of 275 to 400 gallons and are commonly used for residential heating purposes. Above-ground tanks are easier to install, as they do not require any excavation work. They are also more accessible for inspection and maintenance. However, they are exposed to the elements, such as heavy rain, snow, and extreme temperatures, which can lead to wear and tear and potential oil leaks. Above-ground tanks may also be considered an eyesore and can take up space in your yard.
Underground storage tanks are installed below ground level and are used to store oil for residential purposes. They are typically buried under concrete, soil, or vegetation to provide protection and insulation. Underground tanks have a larger capacity, typically holding up to 1,000 gallons of oil, and need to be refilled less frequently. They are not visible, which makes them more aesthetically pleasing. Since they are buried, they are protected from extreme weather conditions, reducing the risk of wear and tear and potential leaks.
However, underground tanks are more difficult to access and require specialized equipment and expertise for maintenance and repairs. They are more susceptible to corrosion from soil and water, which can lead to leaks and costly repairs. Underground tanks also require more complex installation procedures, resulting in higher costs than above-ground tanks.
It is important to note that proper installation, maintenance, and compliance with safety measures and regulations are crucial for the efficient and safe operation of any fuel oil tank. Regular inspections and maintenance can help prevent issues and ensure the longevity and optimal performance of the tank.
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Installation and placement
Fuel oil tanks, also known as heating oil tanks, are an integral part of a home heating system, storing the fuel that keeps your home warm. There are two basic types of fuel oil tanks: above-ground storage tanks (AST) and underground storage tanks (UST).
When it comes to installing and placing your fuel oil tank, there are several important factors to consider:
Size and Capacity:
Choose a tank that fits the capacity you need for your home. Ensure that it has enough space for sending, storage, and expansion of oil. Check your local codes and regulations, as they may place restrictions on the size of the oil tank.
Location:
Select a safe location for placing the tank, either indoors or outdoors. Most experts recommend installing fuel oil tanks indoors, as outdoor tanks are exposed to the elements, which can cause corrosion and damage. Basements are often ideal due to their solid cement foundation. If installing outdoors, pick a flat location in your yard that can support the weight of a full oil tank and is easily accessible for installation, maintenance, and refueling. Avoid installing near water lines, septic systems, or plants that may be damaged by fuel leakage.
Compatibility:
Ensure that the materials and fittings you choose are compatible with your fuel type. Some tanks are only suitable for heating oil, while others may also be compatible with diesel or gasoline.
Compliance and Regulations:
Comply with local building codes, fire codes, and safety requirements. Check with your homeowner's insurance provider to determine if they have any restrictions or requirements for above-ground oil tank installations. Ensure that your installation site allows for all-around inspection of the tank. Position the tank at least five feet away from any fuel-powered equipment or fuel-fired appliances.
Installation Process:
Once you have selected the appropriate tank and location, follow these steps:
- Install metal legs onto the oil tank if they are not already attached. The legs should measure approximately 11 inches at the outlet end and 12 inches at the other end, providing a slight slope for the shutoff valve and filter.
- Level and stabilise the tank. You may need to dig a hole or secure the tank with anchoring devices.
- Connect all pipe fittings, including the regulator, vent pipes, supply lines, and shutoff valves, according to the manufacturer's instructions and local codes.
- After installation, have your local fire department inspect and approve your tank before use.
- Open all valves and fill the tank slowly, monitoring the level to ensure it does not exceed 95% full, leaving room for expansion.
- Connect the tank to your oil supply and any appliances requiring fuel oil.
By following these guidelines for installation and placement, you can ensure the safe and efficient operation of your fuel oil tank.
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Maintenance and safety
Fuel oil tanks are an integral part of any home heating system, storing the fuel that keeps your home warm during colder months. They are typically made of steel and can be installed above or below ground.
Installation and Placement
Proper installation and placement of your fuel oil tank are of utmost importance. It is recommended to hire certified technicians to ensure compliance with local regulations and safety standards. Above-ground tanks are generally more accessible for inspection and maintenance, while underground tanks offer space-saving benefits. However, underground tanks are less encouraged due to environmental and financial concerns.
Regular Inspections and Maintenance
Regular inspections and maintenance are vital to identify and address potential issues early on. This includes checking for leaks, monitoring tank and fuel levels, and cleaning filters. Be vigilant for signs of corrosion, leaks, or fuel odours, and address them promptly. Regular maintenance will also help prevent fuel wastage and ensure the efficient use of your fuel oil tank.
Safety Measures
Familiarize yourself with safety measures and regulations, such as proper venting, fire protection, and spill prevention. Water is one of the biggest factors that can damage your tank, so it is crucial to detect and remove water and contaminants regularly. Use water-sensitive fuel filters and periodically sample fuel from different areas of the tank to detect water presence. Ensure workers have access to personal protective equipment (PPE) such as earplugs, respirators, gloves, and eye protection when accessing the tank.
Tank Compatibility and Fuel Composition
It is important to ensure your tank is compatible with all compositions of ethanol and to be aware of changing fuel compositions. For example, new requirements have increased the amount of ethanol and biodiesel required to be blended into the fuel supply. This can impact how you maintain your tank and the potential for water bottoms, which occur when water condenses and collects at the bottom of the tank.
Size and Supply Considerations
When selecting a tank, consider factors such as consumption rate, supply reliability, and the size of your home. Consult with professionals to determine the appropriate tank size and establish a reliable supply contract to avoid issues with fuel supply.
By following these maintenance and safety guidelines, you can maximize the longevity, efficiency, and safety of your fuel oil tank.
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Common issues and solutions
Fuel oil tanks are essential for oil heating systems, providing a secure method to store fuel. However, they can encounter various issues, including leaks, clogs, and corrosion, which can lead to reduced performance and even engine failure. Here are some common problems and their solutions:
Water Intrusion and Condensation
Water intrusion is a frequent issue with fuel oil tanks, leading to condensation and potential freezing. Water can enter the tank through various means, such as rainwater, condensation from moist air, or groundwater for underground tanks. This can cause operational issues as water freezes at 0°C (32°F), obstructing oil supply pipes and potentially causing system failure.
Solution: Regular maintenance and inspections are crucial. Use water-finding paste to detect water, and if present, have a professional remove it. Keep the tank full to reduce condensation risk, and consider optimal placement to minimise exposure to external moisture.
Sludge Build-up
Sludge, a by-product of bacterial growth in water-contaminated tanks, can clog pipework and damage the heating system.
Solution: Regularly inspect and clean the tank to prevent sludge build-up. Ensure timely oil deliveries and store oil appropriately to minimise water intrusion, a precursor to sludge formation.
Leaks and Corrosion
Leaks can result from corrosion, which is often indicated by cosmetic damage like rust spots or dents.
Solution: Proactively check your tank for signs of corrosion and address them early. Regularly inspect, maintain, and replace parts as necessary. Consider using additives to protect against corrosion, especially in summer when leaks are more likely.
Clogged Filters
Clogged filters can restrict fuel flow, leading to poor engine performance or failure to start.
Solution: Regularly replace fuel filters according to the manufacturer's recommendations. Clean the fuel system and use fuel additives to maintain optimal performance.
Faulty Fuel Pumps
A failing fuel pump may exhibit signs such as loud electrical noises when the engine is running, or the engine being hard to start.
Solution: Consult a certified mechanic to diagnose and repair the issue. Use high-quality components for any replacements to ensure longevity and prevent further issues.
Remember, regular maintenance and proactive inspections are key to preventing major issues with your fuel oil tank. Adjust maintenance routines seasonally to account for winter and summer conditions.
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Sizing and capacity
The sizing and capacity of a fuel oil tank are crucial aspects to consider when choosing one for your home. The size of the tank you require is influenced by factors such as the size of your home, family size, climate conditions, heating system efficiency, and lifestyle preferences. For instance, larger homes require bigger oil tanks due to the increased space that needs to be heated. Similarly, as your family grows, your energy consumption increases, impacting the size of the tank you need. Climate conditions also play a role, as colder climates may require a larger tank to meet higher heating demands.
Residential heating oil tank sizes typically range from 220 gallons to 1,000 gallons. The average size used in homes is often quoted as 275 gallons, with the second most common size being 330 gallons. However, it's worth noting that tank sizes can vary depending on whether they are installed above or below ground. Above-ground tanks are generally more accessible for inspection and maintenance, with common sizes including 288, 340, 420, 500, 550, 675, and 1000 gallons. Underground tanks, while providing space-saving benefits, are discouraged within the heating, financial, and environmental industries.
The capacity of a fuel oil tank is typically measured in gallons and can be determined in a few ways. Newer tanks usually have their capacity listed on the tank's nameplate. However, if you have an older tank without this information, you can estimate its capacity based on its dimensions (height, width, and depth). Additionally, you can fill an empty tank with water to accurately determine its oil-holding capacity.
When considering the sizing and capacity of a fuel oil tank, it is recommended to consult with heating professionals or reputable heating oil suppliers. They can provide guidance based on your specific needs and help you make an informed decision to ensure an adequate fuel supply for your home.
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Frequently asked questions
A fuel oil tank is a container that stores fuel to keep your home warm.
There are two basic types of fuel oil tanks: above-ground storage tanks (AST) and underground storage tanks (UST).
If your home has a basement or exposed pipes underneath, you can follow the pipes to see if they lead to an outside wall. You can also look for a fill cap, which is usually flush with the ground, or use a metal detector to locate the tank.











































