Choosing the right propane tank size is one of the most important decisions you’ll make for your home, farm, or business. Buy too small and you’ll run out of gas constantly. Buy too large and you’ve wasted money on a tank you don’t need.
This guide breaks down every common propane tank size so you can make the right call.
Quick Reference: Propane Tank Sizes by Use Case
| Tank Size | Best For | Approx. Heating Capacity |
|---|---|---|
| 120 gallon | Fireplaces, pool heaters, small appliances | Up to 1,200 sq ft |
| 250 gallon | Small homes, backup heat | Up to 1,500 sq ft |
| 500 gallon | Whole-home heating, most residential | 1,500 – 2,500 sq ft |
| 1,000 gallon | Large homes, commercial, farms | 2,500+ sq ft or high usage |
| 2,000+ gallon | Agricultural, light commercial | Multiple buildings |
| 10,000+ gallon | Industrial, fleet fueling, bulk storage | Commercial/industrial |
120-Gallon Propane Tank
The 120-gallon tank (also sold as the “420 lb” DOT cylinder) is the most common residential supplemental tank. It’s ideal for fireplaces, water heaters, dryers, and pool/spa heaters in moderate climates. It is not sufficient as a primary heating source for a full home in cold climates — you’d refill too often.
250-Gallon Propane Tank
A 250-gallon tank works well for small homes under 1,500 square feet in mild climates, or as a dedicated tank for cooking + water heating in a larger home. Many homeowners use a 250-gallon as a secondary tank for cooking and hot water while a larger tank handles heat.
500-Gallon Propane Tank
The 500-gallon tank is the most popular residential size in the U.S. It comfortably handles whole-home heating for most homes up to 2,500 square feet. If your home is all-propane (heat, water heater, stove, dryer), a 500-gallon tank typically requires 2–3 refills per year in northern climates.
1,000-Gallon Propane Tank
A 1,000-gallon tank is the right choice for larger homes over 2,500 square feet, homes in very cold climates, or properties that also power a generator, pool heater, or agricultural equipment. You’ll typically only need one refill per year, which lowers per-delivery costs significantly.
Above Ground vs Underground: Does It Affect Size?
No — all common residential sizes (120 to 1,000 gallons) are available in both above-ground and underground configurations. Underground tanks are preferred where aesthetics matter or where a tank must be installed near a structure. They require a riser and anode bag for corrosion protection.
How to Calculate the Size You Need
A simple rule of thumb: multiply your home’s heated square footage by 1.5. That gives you the approximate annual propane usage in gallons. Then choose a tank that holds at least 80% of that amount (tanks are typically filled to 80% capacity).
For example: a 2,000 sq ft home × 1.5 = 3,000 gallons per year. A 1,000-gallon tank refilled 3 times per year covers that comfortably.
Shop by Size
At Propane Tank Traders, we carry every size from 120-gallon residential tanks to 30,000-gallon industrial storage bullets — all ASME or DOT certified, with $350 flat-rate freight shipping to all 50 states.