Quick answer: Most homes that heat with propane need a 500-gallon tank, which holds about 400 usable gallons and can run a furnace along with everyday appliances. Homes that use propane for only one or two appliances often do fine with a 120- or 250-gallon tank, while large or all-propane homes may need 1,000 gallons. The right size comes down to your appliances, how cold your winters get, and how often you want deliveries.
Choosing a propane tank is really a question of demand. A tank that is too small means frequent refills and a higher chance of running low on a cold night. A tank that is too large costs more up front and takes up more of your yard than you need. Here is how to match the tank to your home so you get reliable heat without overpaying or crowding your property.
What Determines the Right Propane Tank Size?
Three things drive the decision: which appliances run on propane, how much you rely on propane for heat, and how often you want a delivery truck at your home. A house that uses propane only for a cooktop and a water heater has a small, steady appetite. A house that heats every room with a propane furnace, plus a water heater, dryer, and fireplace, burns far more, especially across a Virginia winter. The more appliances you connect and the colder your climate, the larger the tank you want so you are not scheduling refills every few weeks.
“Propane is also used throughout the year for water heating, cooking, and clothes drying.”
U.S. Energy Information Administration
That year-round load matters. Even in summer, when the furnace is off, your water heater and range keep drawing from the tank, so sizing only for peak winter heat can leave you short the rest of the year.
What Are the Common Residential Propane Tank Sizes?
Residential propane tanks come in four common sizes. Because a tank is only filled to about 80 percent (more on that below), the usable amount is always less than the number on the label. The usable figure, not the rated size, is what you should plan around.
| Tank Size | Usable Propane (at 80%) | Approx. Dimensions | Best For |
|---|---|---|---|
| 120 gallon (upright) | ~96 gallons | 4’6″ H × 30″ dia. | 1–2 appliances: water heater, range, dryer, or fireplace |
| 250 gallon | ~200 gallons | 7’10” L × 30″ dia. | Supplemental heat or a couple of appliances; smaller homes |
| 500 gallon | ~400 gallons | 9’11” L × 37.5″ dia. | Whole-home heating; the most common residential size |
| 1,000 gallon | ~800 gallons | 16’2″ L × 41″ dia. | Large homes, all-propane homes, or homes with a pool heater |
Which Propane Tank Size Is Right for Your Home?
A 120-gallon tank works for homes that use propane for one or two appliances, such as a water heater, a range, a clothes dryer, or a gas fireplace. It is compact enough to sit close to the house and is a common choice when propane is a convenience rather than the main heat source.
A 250-gallon tank fits homes that use propane for supplemental heat or a couple of larger appliances. It is a reasonable middle option for smaller homes, or for a home that heats another way but wants propane for a generator, pool, or secondary heater.
A 500-gallon tank is the workhorse for whole-home heating and the size most Virginia homes land on. With about 400 usable gallons, it can run a propane furnace along with a water heater and other appliances, and it holds enough fuel that you are not waiting on a delivery in the middle of a cold snap.
A 1,000-gallon tank makes sense for larger homes, homes where every major appliance runs on propane, or properties with a high-demand item like a pool heater or a standby generator. The extra capacity means fewer deliveries across the year and a bigger buffer during an extended freeze. Davenport Energy installs and leases residential propane tanks in these sizes and can help you match one to your home.
Why Doesn’t a Propane Tank Fill All the Way?
You may notice your gauge tops out around 80 percent after a fill. That is intentional and required for safety. Propane is stored as a liquid, and like most liquids it expands as it warms. Propane expands much more than water for the same rise in temperature, so tanks are deliberately left about one-fifth empty to give the liquid room to grow on a hot day without over-pressurizing the tank. This is why a 500-gallon tank holds roughly 400 gallons, and why usable capacity is the number that matters when you size a tank.
Where Can a Propane Tank Go on Your Property?
Tank placement follows safety codes, chiefly NFPA 58, plus any stricter local rules. The required distances grow with tank size:
- A 120-gallon tank can generally sit close to the home, though fill points and vents must stay at least 10 feet from any door, window, or ignition source.
- A 250- or 500-gallon aboveground tank must be at least 10 feet from your house and 10 feet from your property line.
- A 1,000-gallon tank pushes those distances out to 25 feet from buildings and property lines.
Underground tanks follow their own set of rules. Because local jurisdictions often adopt requirements stricter than the national baseline, placement and installation should always be handled by a qualified installer who knows your local code. Davenport Energy’s team sizes, sets, and connects tanks so the installation meets code the first time. If a furnace, water heater, or other appliance needs service, that work should go to a qualified heating technician.
Should You Lease or Buy Your Propane Tank?
Both options are common. Leasing a tank from your propane supplier keeps the up-front cost low and puts maintenance, inspections, and repairs on the provider, which is why many homeowners lease. Buying a tank gives you ownership and the freedom to shop suppliers, but you take on the cost of installation and upkeep. If you are just starting propane service, leasing is often the simpler path. Davenport Energy offers tank installation and leasing, and once your tank is in, automatic delivery keeps it filled so you rarely have to think about your level.
Propane Tank Size FAQs
What size propane tank do I need for a whole house?
Most homes that heat with propane use a 500-gallon tank, which holds about 400 usable gallons and can run a furnace along with a water heater and other appliances. Larger or all-propane homes may need a 1,000-gallon tank.
How many gallons does a 500-gallon propane tank actually hold?
About 400 gallons. Propane tanks are filled to roughly 80 percent to leave room for the liquid to expand as temperatures rise, so usable capacity is always less than the tank’s rated size.
How far does a propane tank have to be from my house?
Under NFPA 58, a 250- to 500-gallon aboveground tank must sit at least 10 feet from your home and property line, and a 1,000-gallon tank at least 25 feet. Local codes can be stricter, so a qualified installer should confirm placement.
Is it better to lease or buy a propane tank?
Leasing keeps up-front costs low and puts maintenance and inspections on your supplier, which is why many homeowners lease. Buying gives you ownership but adds installation and upkeep costs. Davenport Energy offers tank installation and leasing.
What size propane tank do I need for just a stove or water heater?
A 120-gallon tank is usually enough for one or two appliances such as a range, water heater, dryer, or fireplace. A 250-gallon tank adds room for supplemental heat or a second large appliance.
Propane Tank Service in Southern Virginia
Davenport Energy has delivered dependable fuel across southern Virginia for four generations. If you are adding propane service or replacing a tank, our team can size the tank to your home, install it to code, and keep it filled with automatic delivery. Reach out through our contact page to get started.
Davenport Energy
120 S. Main Street, Chatham, VA 24531
Call: (434) 432-0251