Katerina Swanson
The capacity of a fuel oil tank varies depending on its size and design. Residential heating oil tanks typically range in size from 250 to 1,000 gallons, while larger tanks may be used for commercial or industrial purposes. The most common capacity for an above-ground heating oil tank is 275 gallons, but the range is 105 to 500 gallons. Underground tanks are commonly sized at 1,000 gallons and are usually filled to about 900 gallons.
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What You'll Learn
Common fuel oil tank sizes
The capacity of a fuel oil tank varies depending on its size and design. Residential heating oil tanks typically range in size from 250 to 1,000 gallons (946 to 3,785 litres). The most common size of heating oil tank is 275 gallons. However, the actual amount of fuel in a full 275-gallon tank is closer to 240 or 225 gallons, as some space is needed to allow for air and debris.
The 1,000-gallon cylinder is a common size for underground tanks, usually filled to about 900 gallons. The 275-gallon vertical oil tank is the most common for home heating oil. This type of tank is typically filled to a maximum of about 250 gallons to allow for expansion. The 330-gallon vertical steel tank is similar but is a foot longer. These tanks are generally filled to around 300 gallons.
The 275-gallon horizontal (flat) tank has the same shape as its vertical counterpart but lays flat for low-clearance installations. They are less common but are still used in crawl spaces and under decks. Other common tank sizes include 340 and 420 gallons. The size is often indicated on the side of the tank, although older models may not include this information.
The amount of fuel in a tank at a given time can be determined in two basic ways. The first and easiest method is to read the heating oil tank gauge, which is a clear glass or plastic cube marked with numbers like a gas gauge on a car. A red indicator shows the amount of fuel left. The second way is to manually check the fuel level with a six-foot-long stick or dowel and a pencil.
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How to measure oil in a fuel tank
The most common capacity for an above-ground heating oil tank is 275 gallons, but the range is 105 to 500 gallons. When full, a 275-gallon tank holds approximately 225 gallons, with the rest of the space left for air and debris.
There are two ways to check the level of oil in your tank: reading the gauge or physically measuring the amount of oil.
Reading the gauge
The heating oil tank gauge is a clear glass or plastic cube marked with numbers that look similar to a gas gauge in a car. A red indicator shows the amount of fuel left in your tank. If the marker is at the bottom of the gauge or not visible, the tank is empty or close to it. To check if the gauge is working, carefully remove the outer case and gently press the float down. If it bobs back up, the gauge is working.
Physically measuring the amount of oil
You can physically measure the depth of oil in tanks that have a vertical fill pipe by "sticking" the tank. You will need a stick that is at least six feet long. Remove the cap from the fill pipe and carefully slide the stick in until you reach the bottom of the tank. Keep the stick as straight as possible. Then, remove the stick and measure how many inches of oil are shown. Next, use an online calculator or a fuel oil tank chart to determine how many gallons of oil are in the tank.
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How much oil is left in a tank when it reads half full
The amount of oil left in a tank when it reads half full depends on the size and capacity of the tank. The most common size for a heating oil tank is 275 gallons, but the capacity of a heating oil tank can vary widely, typically ranging from 250 to 1,000 gallons.
When a 275-gallon tank reads as half full, it actually contains about 110 to 120 gallons of heating oil, not 135 or so. This is because every oil storage tank needs room for air and the debris that settles at the bottom of the tank. Practically speaking, a "full" 275-gallon tank will only contain around 225 to 240 gallons of heating oil.
The same principle applies to other common tank sizes. For example, a 330-gallon vertical steel tank is typically filled to around 300 gallons, while a 1,000-gallon underground tank is usually filled to about 900 gallons. Oil companies will generally fill a tank to about 90% of its rated capacity to allow for expansion.
To determine the exact capacity of your heating oil tank, you can usually find this information on a label or plate attached to the tank. This label may indicate the tank's capacity in gallons or liters. If the tank is not labelled, you may need to refer to any paperwork or documentation from when the tank was installed.
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How often to order fuel oil
The frequency with which you should order fuel oil depends on several factors. The size of your oil tank is one of the most important factors. The most common capacity for an above-ground heating oil tank is 275 gallons, but tanks can range from 105 to 500 gallons. When full, a 275-gallon tank typically holds around 225-240 gallons of fuel oil, as some space is needed for air and debris.
Other factors that influence how often you should order fuel oil include the outside temperature, the efficiency of your heating system, and the size and insulation of your home. For example, if outdoor temperatures average around 32° over a 24-hour period, a 2,500 square foot house will burn about six to seven gallons of heating oil per day. Therefore, if you have a quarter of a tank of oil left in your 275-gallon tank, you can estimate that you have enough oil to last about a week.
It is recommended to check the gauge on your tank more frequently during the winter, such as every couple of days, to ensure you do not run out of heating oil. Ordering fuel oil when your tank is about one-quarter full is a good practice to maintain a consistent supply and get the best price. Additionally, it is important to be aware of the weather forecast, as cold temperatures can increase demand for heating oil, and you want to ensure your order is placed before any potential rush.
To determine how much heating oil you currently have in your tank, you can use the oil tank gauge, which is typically located on top of the tank. If your gauge reads half full, you likely have around 110-120 gallons of heating oil left. It is also possible to measure the fuel level by removing a stick from the tank and observing the wet mark, or by using a Smart Oil Gauge that connects to your home's WiFi network and provides remote monitoring of your tank level.
By considering the size of your oil tank, the various factors influencing fuel consumption, and regularly checking your fuel levels, you can make informed decisions about how often to order fuel oil to maintain a comfortable and safe living environment.
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How to choose a new home heating oil tank
Home heating oil tanks come in a variety of shapes and sizes, and choosing the right one for your needs can be a challenging task. Here is a comprehensive guide to help you select a new home heating oil tank:
Know Your Current Tank
Before choosing a new heating oil tank, it is helpful to understand the specifics of your current tank, including its size, capacity, and any unique features. This knowledge will provide a baseline for selecting your new tank.
Determine Your Oil Requirements
Consider your household's oil consumption patterns and future plans. If you have a growing family, your energy needs will likely increase over time. Additionally, factors such as seasonal temperature changes and lifestyle choices (e.g., extended vacations or preferences for warmer temperatures) will influence your oil requirements. Understanding your oil usage will help you decide on the appropriate tank size and capacity.
Choose the Right Type of Tank
Heating oil tanks are available in various types, each with its advantages and drawbacks. Here are some common types to consider:
- Single-skinned tanks: These tanks are inexpensive due to lower manufacturing costs. However, they are prone to leaks and damage, have shorter lifespans, and are subject to strict regulations. If a leak occurs, the cleanup costs can be high.
- Double-skinned tanks: These tanks offer better security with an extra layer of protection. They often have a plastic inner tank and steel outer walls, providing higher capacity and improved leak prevention.
- Bunded oil tanks: These tanks have a secondary containment system, featuring an internal 'bund' or 'tank within a tank'. The outer tank provides an extra layer of protection, helping to prevent leaks and spills. Bunded tanks can be made of plastic, steel, or a combination of both materials.
- Underground oil tanks: These tanks are installed underground, saving space and potentially reducing the risk of theft. However, installing underground tanks can be complicated and may require planning permission.
Consider Common Options
The two most common home heating oil tanks in the market are the Roth DWT tank and the Granby steel tank. Granby steel tanks are widely available in sizes ranging from 138 gallons to 330 gallons and are generally less expensive. Roth tanks, on the other hand, offer a smaller footprint and a longer warranty, though they may carry a higher price tag.
Think About Additional Features
Consider adding a Smart Oil Gauge to your new tank. This device allows you to monitor your oil levels remotely and provides consumption data, helping you optimize your thermostat settings and conserve oil.
Consult Experts
When in doubt, seek guidance from professionals. Companies like Heatingoil.co.uk offer assistance in choosing the right tank for your needs and provide installation services with OFTEC-registered engineers.
Remember, the key to choosing the right home heating oil tank is understanding your unique requirements and selecting a tank that aligns with your oil consumption patterns, space availability, and budget.
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Frequently asked questions
The capacity of a heating oil tank depends on its size and design. Residential heating oil tanks typically range in size from 250 to 1,000 gallons.
The most common capacity for an above-ground heating oil tank is 275 gallons. However, the range is 105 gallons to 500 gallons.
A "full" 275-gallon heating oil tank will only contain about 225-240 gallons of heating oil. The rest of the space is left to allow for air and debris to settle at the bottom of the tank.
A 1000-gallon cylinder is a common size for underground tanks and is usually filled to about 900 gallons.
