“How much propane does an RV furnace use?”
RV furnaces can use a surprising amount of propane, especially during cold weather camping. The exact amount depends on the furnace size, outside temperature, insulation, and how often the furnace cycles on and off.
In general, most RV furnaces burn between:
- 20,000–40,000 BTUs per hour
- Roughly 0.2–0.4 gallons of propane per hour of continuous operation
That means an RV furnace can empty a propane tank faster than many RV owners expect during freezing temperatures.
Average RV Furnace Propane Usage
Here is a general idea of propane consumption by furnace size:
| Furnace Size | Approximate Propane Use |
|---|---|
| 20,000 BTU Furnace | ~0.22 gallons/hour |
| 25,000 BTU Furnace | ~0.27 gallons/hour |
| 30,000 BTU Furnace | ~0.33 gallons/hour |
| 35,000 BTU Furnace | ~0.38 gallons/hour |
| 40,000 BTU Furnace | ~0.44 gallons/hour |
These estimates assume the furnace is running continuously.
In real-world use, the furnace cycles on and off, so actual daily propane usage varies greatly.
How Long Will a 20 lb Propane Tank Last?
A standard 20 lb propane tank holds about 4.7 gallons of propane.
In moderate cold weather, many RV owners get:
- 2–5 days of furnace use from one 20 lb tank
In very cold temperatures, propane usage increases dramatically and tanks may empty much faster.
What Causes High Propane Consumption?
Several factors affect how much propane your RV furnace uses:
Cold Outdoor Temperatures
The colder it gets outside, the longer the furnace runs.
Poor RV Insulation
Drafts, single-pane windows, and poor insulation force the furnace to cycle more often.
Furnace Size
Larger furnaces naturally burn more propane per hour.
Thermostat Settings
Keeping the RV at 75°F uses significantly more propane than maintaining 65°F.
Weak Battery Voltage
Low 12V voltage can cause inefficient furnace operation and short cycling.
Is It Normal for an RV Furnace to Burn Through Propane Quickly?
Yes — especially in winter camping conditions.
Many RV owners underestimate how much propane an RV furnace uses because furnaces are one of the largest propane-consuming appliances in an RV.
If your propane seems to disappear unusually fast, however, you may also want to inspect for:
- Propane leaks
- Furnace running continuously
- Poor door/window seals
- Thermostat problems
- Improper burner operation
Tips to Reduce RV Furnace Propane Usage
You can often extend propane tank life by:
- Lowering thermostat temperature overnight
- Using insulated window covers
- Sealing drafts
- Adding skirting around the RV
- Using an electric space heater when hookups are available
- Keeping batteries fully charged for proper furnace operation
Common RV Furnace Sizes
Some common RV furnace BTU ratings include:
- 16,000 BTU
- 20,000 BTU
- 25,000 BTU
- 30,000 BTU
- 35,000 BTU
- 40,000 BTU
Popular furnace brands include:
- Suburban RV furnaces
- Dometic / Atwood RV furnaces
FAQ
How much propane does an RV furnace use per hour?
Most RV furnaces use approximately 0.2–0.4 gallons of propane per hour of continuous operation.
How long will a 30 lb propane tank last running an RV furnace?
A 30 lb propane tank holds roughly 7 gallons of propane and may last several days depending on weather and furnace runtime.
Do RV furnaces use a lot of propane?
Yes. RV furnaces are typically one of the largest propane-consuming appliances in an RV.
Why is my RV furnace using propane so fast?
Cold temperatures, poor insulation, high thermostat settings, and continuous furnace cycling are common causes.
Does battery voltage affect propane usage?
Indirectly, yes. Low voltage can cause inefficient furnace operation or ignition problems.