What You’ll Learn
What size propane tank do I need for my whole-home generator?
Your generator burns 2-3 gallons of propane per hour, which means a 500-gallon tank can keep it running for 6-7 days straight.
But size isn’t the only factor—where you put the tank matters just as much for convenience, maintenance, and peace of mind.
In this blog:
This blog was updated February 2026.
The lights flicker. Then everything goes dark.
Your new whole-home generator kicks on automatically—just like you planned. For now, you’re comfortable. But a question nags at you as the storm rages outside: how long will the propane last?
The answer depends entirely on the tank feeding it. Choose wrong, and you’re rationing power. Choose right, and you ride out the outage without a second thought.
Understanding Propane Consumption for Your Whole Home Generator
Whole-home generators burn 2-3 gallons of propane per hour and last 6-7 days under continuous use.
Modern whole-home generators are equipped with load management systems that adjust power output based on the electrical load. These systems help optimize fuel consumption by avoiding unnecessary high loads and conserving propane during lower-demand periods.
They’re also designed to be more fuel-efficient, conserving propane and reducing operating costs.
Propane Supply for Occasional Generator Usage
A compelling reason to choose a 500-gallon underground propane tank for your whole-home generator is its ample propane storage for occasional generator usage.
Extended Outage Readiness
A 500-gallon underground propane tank provides a substantial propane supply, ensuring your whole-home generator is ready for extended outages.
Whether it’s a severe storm, an equipment failure, or any other reason for a power outage, you can rely on your generator to keep your home running smoothly without worrying about running out of fuel.
Tank Monitors for Peace of Mind
Kauffman Gas offers tank monitors as part of their services for customers with underground tanks.
These monitors send real-time data to your supplier when your generator turns on and consumes fuel, ensuring that your tank is always at an optimal level with proactively scheduled refills.
With a larger underground tank, you can be sure your generator will run for an extended time.
This is particularly important during prolonged outages when access to electricity is uncertain. During an emergency, you won’t have to monitor your propane levels or constantly scramble to order refills.
Aesthetic Appeal
Homeowners primarily opt for an underground propane tank for aesthetic reasons, particularly when they have a whole-home generator.
- Visual Harmony: The aesthetic appeal of underground propane tanks stems from their ability to blend into the surrounding landscape seamlessly.
- Landscaping Freedom: Whether you want to create a beautiful garden or install a new patio, the absence of an above-ground tank makes your landscaping projects easier to plan and execute.
Low-Maintenance
One significant advantage of a 500-gallon underground propane tank is that it requires minimal maintenance. Once properly installed, it becomes a hassle-free component of your whole home generator setup, allowing you to save time and effort.
Corrosion Resistance
Underground propane tanks are well-protected from the elements, reducing the likelihood of corrosion.
The earth acts as a natural insulator, shielding the tank from harsh weather, particularly damaging above-ground tanks.
This is particularly important for whole-home generator owners, as it ensures the tank remains in excellent condition, safeguarding your investment and ensuring it’s ready when you need it.
Structural Integrity
Above-ground tanks require periodic repainting to prevent corrosion and maintain their appearance. In contrast, underground tanks don’t need repainting, saving time and money.
Additionally, underground tanks are not exposed to structural stress from external elements, reducing the need for structural integrity checks.
Leak Prevention
Underground tanks are less prone to leaks, as they are buried and protected from accidental damage.
On the other hand, above-ground tanks are more exposed and vulnerable to damage from falling debris, vehicles, or other accidents.
This extra layer of security is paramount for whole-home generator owners, as it ensures the safety of both the property and the generator system.
Environmental Considerations
Underground propane tanks also have environmental advantages.
By keeping the tank buried underground, the risk of environmental damage from:
- natural disasters
- accidents
- vandalism
is significantly reduced.
Underground tanks have protective coatings and other safeguards to enhance their durability and prevent soil contamination.
These measures ensure that the environmental impact is minimized even in the unlikely event of a tank breach.
Underground tanks align with safety and sustainability goals, making them a responsible choice for homeowners.
Prepare for Your New Whole Home Generator with Kauffman Gas
When investing in a whole-home generator, choosing the right propane tank is a crucial decision that impacts aesthetics, maintenance, propane supply, and environmental considerations.
We recommend a 500-gallon underground propane tank because it offers the perfect balance of reliability, convenience, and peace of mind.
If you don’t already have one, Kauffman Gas can help. We’re an experienced propane supplier who can easily complete your underground propane tank project.
When you become a Kauffman Gas customer, you will receive a gallon-for-gallon credit for up to 200 gallons of the propane you’ve already paid for from your current provider.
Become a Kauffman Gas customer today without losing what you’ve paid for.
FAQs
How long will a 500-gallon tank power my generator during an outage?
A 500-gallon tank will run your whole-home generator for approximately 6-7 days under continuous use, since most generators burn 2-3 gallons of propane per hour.
Why would I choose an underground tank over an above-ground one?
Homeowners choose underground tanks for three main reasons: they’re invisible (no eyesore in your yard), they require less maintenance since they’re protected from the elements, and they free up landscaping space for gardens or patios.
Are underground tanks more prone to leaks or corrosion?
Actually, the opposite is true.
Underground tanks are protected from harsh weather, falling debris, and accidental damage.
The earth acts as a natural insulator, and protective coatings prevent soil contamination. They’re often safer than above-ground tanks.
Do underground tanks require a lot of maintenance?
No—that’s one of their biggest advantages.
Once properly installed, an underground tank requires minimal upkeep.
No repainting, no structural integrity checks from weather exposure, and no worry about falling branches or vehicles damaging it.