What size RV furnace do I need
Henry Morales
Published Apr 23, 2026
The average RV furnace uses between 20,000 and 50,000 BTUs. However, the actual amount of propane an RV furnace uses depends on its size. The larger the unit, the higher the BTUs and the more propane used and heat produced.
How big of an RV furnace do I need?
General rule of thumb for an RV furnace is 1k BTU/hr per foot of trailer. Each human adds about 100 watts. A 1.5 kw heater is about 5k BTU/hr (as noted). A 26′ trailer by the rule of thumb would need 5 of those standard 110v heaters.
Can I put a bigger furnace in my RV?
Going with the biggest is not always best. You should stay close to the same output unit that the manufacturer supplied. A furnace too small will stay on longer which will not be efficient and a furnace too big will cycle on and off too frequently. Both will lose efficiency.
How many BTUs do I need for my RV heater?
One rule of thumb for calculating BTUs needed to heat an RV is to estimate 1,000 BTUs per linear foot of the rig. So, a 30,000 BTU furnace can adequately heat a 30-foot trailer.How long will an RV furnace run on a 12 V battery?
If there is no other draw on your batteries, you can expect your heater to run continuously for about 12.5 hours.
How long will RV furnace run on propane?
It might only need to run for a total of 8 minutes each hour to keep you warm. That means the furnace will kick on for 2 minutes about every 15 minutes. And at that rate, one gallon of propane will heat your RV for about 24 hours.
Does RV furnace run off propane or electric?
While your RV’s furnace may utilize electricity to ignite or to control the thermostat, almost all onboard RV furnaces are primarily run on liquid propane — which is a pretty efficient fuel source, all things considered.
How much propane does furnace use?
The average home furnace runs on roughly 100,000 BTUs, and one gallon of propane equals 92,000 BTUs. That means the average home furnace burns roughly one gallon of propane per hour.How much propane does an RV furnace use in winter?
The average sized-RV heater would use ⅓ of a gallon of propane/hour to heat an RV in the winter. Most RVs use 20 lbs or 30 lbs propane tanks, which would last you for 10, respectively 16 hours of continuous use.
How much propane does a 40000 BTU heater use?40,000 BTUs patio heater with a 20lb tank will burn for 9.752 hours. 50,000 BTUs patio heater with a 20lb tank will burn for 7.80 hours.
Article first time published onHow can I heat my RV without propane?
- #1 – Wear Warm Clothes. Dressing in comfortable layers can keep you warm and toasty, both inside and outside the RV. …
- #2 – Pile on the Blankets. …
- #3 – Use an Electric Blanket. …
- #1 – Ceramic Space Heater. …
- #2 – Catalytic Propane Heaters. …
- #3 – Heat Pumps. …
- #4 – Portable Propane Heater. …
- #5 – Wood Stove.
What is an RV furnace?
An RV furnace is usually a forced air system that is powered by both propane and electricity. Propane heats the system and electricity makes the fan move.
Can you run an RV furnace without electricity?
Do RV Propane Furnaces Use Electricity? Yes, but not that much. The furnace needs electricity to ignite the flame and run the fans.
Can I run my RV furnace on 15 amp?
It’s safe to run your RV furnace on 15 amps. … RVs that plug into single phase 120 volt outlets can run on a 15 amp circuit, but just barely if the appliances, such as the refrigerator and furnace, are in use simultaneously.
Will my RV furnace work without a battery?
Your RV needs a minimum of one power source in order to function and supply power to your appliances. If you are already connected to shore power source, you do not need a battery, as long as the converter is working properly.
What powers RV furnace?
RV furnaces use liquid propane to generate heat. But the igniter switch and blower use electricity to operate. So both are typically necessary to operate an RV furnace. So if you’re boondocking you’ll want to use your generator or battery to handle the electric side of things to keep your RV’s heating system going.
What happens when RV furnace runs out of propane?
If a valve or gas line is open when the propane supply runs out, a leak can occur when the system is recharged with propane. Air and moisture that penetrates an empty tank can cause rust build-up inside the tank. Rust decreases the concentration of the odor of propane, making it more difficult to smell.
How can I make my RV furnace more efficient?
Set your RV’s furnace to 52–54 °F (11–12 °C) at night. Rely on your blankets and layers of clothing to keep you warm at night instead of your furnace. Lower your thermostat to this temperature range before you go to bed, so it will only turn on occasionally when it gets really cold during the night.
How long does a 20 lb propane tank last in an RV?
On average, a 20-pound propane tank will run your RV furnace for about three hours of continuous use.
How long does a 30 lb propane tank last in an RV?
That means that a 30 lb. propane tank can run our appliances for 16 hours before running out.
How long will a 20lb propane tank last on a 30000 BTU heater?
A pound of propane has 21,591 btu. So if you had a 21,500 btu heater it would run basically 20 hours on a true 20lb bottle. With a 30,000 btu heater you multiply 21,500×20(pounds)=430,000 and divide by your heater size of 30,000btu. Which gives you 14.34 hours if you run it at full all the time.
How long does a 20lb propane tank last at 50000 BTU?
Lifespan Of 20 lb Propane Tank At 50,000 BTU Output We know that such a tank contains 420,679 BTU and that a heater burns 50,000 BTU worth of propane every hour. That means that in ideal conditions, a 20 lb propane tank at 50,000 BTU lasts for 8.41 hours (8 hours and 16 minutes).
How long will a 500 lb propane tank last for heating?
House Size (Square Footage):How Long Will A 500-Gallon Propane Tank Last?500 sq ft14 Months and 4 Days
How long will a 100 lb propane tank last for heating?
At a consumption rate of 26,000 BTU per hour, your 100-pound bottle will fuel your propane fireplace for about 84 hours, equivalent to 3.5 days of continuous 24/7 operation.
How long will a 100lb propane tank last on a 30000 BTU heater?
So take the BTU’s in the tank and divide it by the BTU’s per hour of your unit and you’ll get the hours of operation until your tank is empty. For example if your unit is 30,000 BTU’s then your tank would last about 72 hours of burn time.
How efficient is propane furnace?
High-efficiency propane furnaces, however, are rated anywhere between 90 and 98 percent efficient. … Although a high-efficiency propane furnace will be at least 90 percent efficient and can lower utility bills and enhance comfort, many homeowners pay the most attention to the initial cost.
How long will a 15000 BTU propane heater last?
Features a soft nose P.O.L. and adjustable regulator with three heat settings – 10,000, 12,500 and 15,000 BTUs. Mounts directly to a 20 lb propane tank with up to a 29 hour run time on high.
How many square feet will 30000 Btu heat?
Heating Output:Square Footage (Standard Climate)Square Footage (Very Cold Climate)15,000 BTU333,3 sq ft250 sq ft20,000 BTU444,4 sq ft333,3 sq ft25,000 BTU555,5 sq ft416,6 sq ft30,000 BTU666,6 sq ft500 sq ft
How much LP will a 30000 BTU heater use?
A gallon of propane weighs approximately 4.2 lbs. A gallon of propane has a burn rate of approximately 100,000 BTUs (British Thermal Units) per hour. This means that if you run your heater continuously (30,000 BTUs) you will be consuming propane at a rate of about 1/3 gallon per hour.
How do you keep your RV warm in the winter?
There are several ways to insulate them: foam insulation boards, bubble insulation, solar blankets, etc. For extra warmth, line your windows with heavy-weight thermal curtains. You may also want to go over your RV windows and doors with a layer of RV sealant or caulk, just to ensure they’re nice and weather-tight.
Are there RVs that don't use propane?
The “all-electric” term refers to using no lp-gas for cooking, heating or operating refrigerators. There are, however, so-called all-electric” RVs that employ residential refrigerators but have propane cooking stoves. These generally are demanded by people who believe gas cooking is the only way to go.