How much is a 500 gallon propane tank? The tank alone typically costs about $1,200- $1,500 before installation, site preparation, and other project expenses.
As with most propane services, its 500-gallon rating refers to total water capacity, not the amount of propane it normally contains — a common source of confusion for an average home shopping for the first time. At the standard 80% fill limit, the tank holds approximately 400 gallons of propane—providing a substantial on-site fuel supply for homes that use propane for heating, cooking, and water heating.
What to Know About 500-Gallon Propane Tank Capacity
A 500-gallon propane tank has a capacity of 500 gallons, but it is normally filled to about 80%. The remaining space allows the liquid propane to expand as its temperature changes, leaving approximately 400 gallons of propane when the tank is full.
That expansion space is an important safety consideration. According to the Propane Education & Research Council, liquid propane expands to approximately 270 times its original volume when released into the air and converted into vapor.
A typical horizontal tank is about 10 feet long and 37 inches in diameter, although dimensions vary by manufacturer. A 500-gallon tank can be installed above ground or as one of several underground models, depending on the property, available space, delivery access and local requirements. Underground installations typically require a concrete pad or similar anchoring to keep the tank stable.
For homeowners, the key distinction is simple: 500 gallons describes the tank’s total capacity—not the amount of propane it normally holds.
Buying vs. Leasing: Which Costs Less Upfront?
Buying requires more money upfront, but you own the equipment and generally have more flexibility when choosing a propane supplier.
Leasing can reduce the upfront cost. McCraw offers propane tanks for purchase or lease, with service and delivery options for residential customers.
The right arrangement depends on your budget, how long you expect to use the tank, and who you want responsible for the equipment.
Could a 500-Gallon Propane Tank Meet Your Home’s Needs?
A 500-gallon home propane tank is often a great choice for a home using propane for several major appliances, offering a relatively compact footprint compared with larger sizes. However, square footage alone should not determine tank size.
| Home size | Typical propane uses | Possible tank size |
|---|---|---|
| Under 1,500 sq. ft. | Cooking + water heating | 250 gal |
| 1,500–3,500 sq. ft. | Heating + cooking + water heating | 500 gal |
| 3,500–5,000 sq. ft. | Full-home propane use | 500–1,000 gal |
| 5,000+ sq. ft. | Full home + generator | 1,000 gal |
A 500-gallon tank can work well for a typical 2–4 bedroom home and several propane appliances, depending on total demand. Your actual needs can change based on:
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Home heating demand
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Number and type of appliances
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Water heaters
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Stoves and ranges
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Clothes dryers
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Fireplaces
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Pool or spa heating
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Backup generators
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Seasonal usage
McCraw’s guide to residential propane tank sizes also recommends considering usage patterns and energy demand rather than choosing a tank based on square footage alone. Commercial buildings and businesses with similar appliance loads can apply the same logic when sizing a tank.
Above Ground or Underground: Choosing the Right Installation
When planning a 500-gallon propane tank installation, you can choose an above-ground or underground setup. The right option depends on cost, visibility, property layout, delivery access, and local installation requirements.
Above-ground 500-gallon tank
An above-ground tank is generally simpler to install and easier to access for inspection and maintenance, offering reliable convenience for most homeowners. It also typically costs less to install, but the tank remains visible on your property.
Underground 500-gallon tank
An underground tank is less noticeable, which can be useful when you want to minimize the tank’s appearance. However, installation requires excavation and appropriate corrosion protection, which can increase the overall installation cost.
What Does a 500-Gallon Tank Installation Require?
Both above-ground and underground tanks must meet applicable safety, clearance, and placement requirements. In Texas and Oklahoma, the requirements can depend on the tank and the property.
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Tank location: The available space and location of the tank can affect where it may be installed.
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Clearances: Required separation distances can vary based on tank capacity and whether the tank is above ground or underground.
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Delivery access: The propane delivery truck needs safe, practical access to the tank.
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Tank support: The tank must be properly supported according to applicable installation requirements, with the gauge easily accessible for reading fuel levels.
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Local requirements: State and local regulations may affect permits, placement, and other aspects of the installation.
If you’re installing a 500-gallon propane tank in Texas or Oklahoma, confirm the site requirements before installation rather than relying on a generic setback number found online.
500 vs. 1,000 Gallon Propane Tanks: Which Size Fits Your Usage?
The main difference is how much propane each tank stores and how much space it takes up.
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500-gallon tank: Holds about 400 gallons at the standard 80% fill level and may suit a moderate-sized home with several propane appliances.
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1,000-gallon tank: Holds about 800 gallons at the same fill level and may suit a larger home or property with higher heating demand, a large generator, pool or spa heating, or several propane appliances.
Space and cost
A 1,000-gallon tank requires more space, including greater length, and typically costs more to purchase and install. Your home’s heating needs, appliances, generator size, available space, and expected propane use should all factor into the decision.
Frequently Asked Questions
How long does a 500-gallon propane tank last for a house?
There is no fixed answer. A 500-gallon tank holds about 400 gallons when filled to the normal 80% level, but how long that supply lasts depends on your home’s size, weather, heating demand, and appliances. For some households, it may last several months before refilling is needed; three to six months is a common estimate, but actual usage can be shorter or longer.
Do I need a permit for a 500-gallon propane tank in Texas?
It depends on the installation and jurisdiction. Texas regulates LP-gas installations through the Railroad Commission of Texas, and local requirements may also apply. The Texas Railroad Commission’s LPG installation guidance explains permitting requirements for regulated installations.
Can I buy my own propane tank instead of leasing?
Yes. Customer-owned tanks are an option, and McCraw offers propane tanks for purchase or lease. Buying requires a larger upfront investment, while leasing can reduce the initial cost. Ownership can also give you more flexibility when choosing a propane supplier, while those who’d rather rent than own can lease instead.
How often do I need to fill a 500-gallon propane tank?
It depends on how quickly your home uses propane. McCraw’s on-demand delivery option recommends calling when the tank reaches about 30%, while its automatic delivery program can schedule deliveries based on your needs.
Because a 500-gallon tank is normally filled to about 80%, a full tank contains roughly 400 gallons of propane rather than 500.
What is the lifespan of a propane tank?
A tank’s service life depends on its condition, corrosion, installation, and maintenance. Stationary ASME tanks do not follow the same requalification schedule as portable DOT cylinders, so there is no single recertification interval that applies to every 500-gallon tank.
Regular inspection and maintenance can help identify corrosion, damage, or other issues that need attention.
Get a Tank Recommendation Based on Your Property and Usage
If you’re still asking how much a 500-gallon propane tank is, remember that the tank price is only part of the decision. Installation, ownership, propane use, and your property’s layout can all affect the final cost.