Understanding Your RV's Propane System
Most RVs use propane for some combination of cooking, space heating, water heating, and refrigeration. Understanding which appliances use propane in your specific rig is the foundation of good propane management — because it determines how fast you'll use it and what will go out first if you run low.
The two main tank types in RVs are:
- DOT cylinders — portable tanks (typically 20 lb or 30 lb) used on most travel trailers and fifth wheels. You detach them to have them filled at a propane station. Many rigs have two cylinders connected by an automatic changeover regulator that switches to the second tank when the first is empty.
- ASME tanks — permanently mounted tanks on most motorhomes, ranging from 25 to 100+ gallons. These are filled in place by a propane truck or at a propane station that has a fill hose. They're larger capacity and don't need to be detached.
Knowing which type you have matters for refilling logistics and for understanding your capacity. A pair of 30 lb DOT cylinders holds about 14 gallons total. A 40-gallon ASME motorhome tank holds about 32 gallons when full.
How Long Does RV Propane Last?
This depends almost entirely on what appliances you're running and the outside temperature. RV propane usage breaks into two very different categories:
Summer / warm weather camping (cooking only)
If you're camping in warm weather and using propane only for cooking — burners 30–45 minutes per day — a pair of 20 lb cylinders (about 9.4 gallons total) might last 3–6 weeks. Cooking is actually one of the lower propane uses in an RV.
Spring / fall camping with nighttime heating
This is where propane consumption spikes dramatically. An RV furnace burns approximately 0.1–0.3 gallons per hour depending on its BTU rating. If the furnace runs 4–6 hours overnight to keep the RV warm, that's 0.4–1.8 gallons per night — just for heating. Add cooking and hot water, and a pair of 20 lb cylinders can be gone in 4–7 days.
Winter camping or cold-weather use
In cold conditions where the furnace runs heavily all night and much of the day, a 20 lb cylinder can empty in 1–3 nights. Full-time winter RVers or those camping in snow conditions typically use significantly more propane than they expect for their first cold-weather trip.
The practical takeaway: always bring more propane than you think you'll need for cold-weather trips, and log your readings in PropanePal across different trips to learn your actual usage patterns under different conditions.
Finding Propane Refills on the Road
Refilling options vary significantly depending on where you're traveling. Here's what to look for:
On-site propane stations (best option)
A dedicated propane dealer, propane supplier, or U-Haul location with a propane fill service will fill your tank to its actual capacity — typically to 80% of the tank's volume per safety regulations. This is usually the cheapest per-gallon option and gives you more propane than an exchange.
Exchange kiosks (Blue Rhino, AmeriGas Exchange)
Exchange kiosks at hardware stores, grocery stores, and gas stations let you swap an empty cylinder for a pre-filled one. They're convenient and widely available, but there are important trade-offs: exchange tanks are typically filled to only 15 lbs (not the full 20 lb capacity), and you pay a flat rate regardless of how much propane was left in your old tank. If your old tank had 5 lbs left, you're leaving that propane behind.
Campground propane
Many RV parks and campgrounds sell propane, often at a premium. It's convenient when you're already there and low on propane, but compare prices if you have a choice.
Tips for finding propane on a trip
- Search "propane near me" or "propane refill" when you know you'll need one in the next day or two
- Ask at the campground office — they usually know the nearest fill station
- Plan a fill before heading into remote areas with no services for several days
- Note your gauge before departure every morning on long trips
RV Propane Safety Basics
A few non-negotiable safety habits for RV propane use:
- Turn off propane before driving. In most RVs, the main propane valve should be closed while the vehicle is in motion. The exception is propane refrigerators — some RVers run these on propane while driving, but be aware that this varies by campground and jurisdiction rules.
- Never run a generator inside the RV. This applies to gasoline and propane generators alike — CO is lethal in an enclosed space.
- Have your CO and propane detectors tested regularly. RVs typically have combination CO/propane detectors. Test them monthly and replace them per the manufacturer's schedule (typically every 5–7 years).
- Have your system inspected annually. A qualified propane technician should inspect your RV's propane system — regulator, lines, connections, and appliances — each year or whenever you notice any sign of a problem.
If you smell propane: Open windows, turn off all flames, exit the RV, do not operate any electrical switches, and call 911 and your propane supplier from a safe distance. Never re-enter until cleared by a professional.
Tracking RV Propane With PropanePal
PropanePal works well for RV propane tracking because it works completely offline — no cell service or WiFi required. Log a gauge reading before each trip and after each refill. Over time, the app builds a usage history that lets you see exactly how much propane you typically use per day under different conditions.
For RVs with dual DOT cylinders, add each cylinder as a separate tank entry in PropanePal (Premium) and track them independently. For motorhomes with a single ASME tank, add one tank entry with the tank's total capacity.
The most useful habit for RV propane management: log the gauge reading right before you leave for a trip, log any refills when they happen, and log the gauge reading when you return. A season of this gives you a reliable picture of what any given type of trip costs in propane.