INSTAHEAT ULTRA
35K BTU RV Propane Furnace
$799.99
$1,299.99
Save $500.00
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Stronger ducted heat for colder RV travel.
InstaHeat 35K delivers four heating levels from 17K to 35K BTU through a central duct system. Rapid, Standard and Sleep modes, 320 CFM airflow and a 40 dB sleep setting give owners more control over recovery time and overnight comfort.
View all features ↓Best for larger compatible ducted RVs and colder trips that need the highest furnace output in this range.
35,000 BTUMaximum propane heating output
4 heat levels17K / 25K / 30K / 35K
320 CFMAirflow for central RV ducting
40 dBSleep-mode sound
Secure checkout
More options available at checkout
30-day returns
Free contiguous U.S. shipping
2-year warranty
Choose your InstaHeat furnace
CURRENT MODEL
InstaHeat 35K
35K BTU · 320 CFM
Choose 35K whenA larger compatible ducted RV and colder travel require the highest output in the range.
InstaHeat 30K
30K BTU · 260 CFM
Choose 30K whenA compatible mid-size RV needs balanced ducted heating recovery.
InstaHeat 25K
25K BTU · 240 CFM
Choose 25K whenA smaller compatible RV and lower calculated heat load make 25K the right size.
Fit and installation
- Furnace dimensions
- 17.7 W × 7.8 H × 20.1 D in
- Power supply
- 12V DC
- Duct outlet
- 4-in round
- Duct connections
- 7 openings
- Mounting
- Horizontal / vertical
- Heating system
- Central ducted
- Size
- 20.1 × 17.7 × 7.8 in
- Weight
- 27.6 lbs / 12.5 kg
Confirm cabinet space, return-air area, duct count, propane connection, exterior access and exhaust location. Non-horizontal mounting requires the approved bracket.
What’s included
- ✓FurnaceInstaHeat 35K propane heating unit
- ✓ControllerSmart wired controller
- ✓Access configurationSelected door option
- ✓Product documentationInstallation and operation manual
- ✓Package hardwareParts shown for the selected variant
Ducting, propane-line materials and vertical-mount brackets may need to be ordered separately.
Specifications
- Maximum heat output
- 35,000 BTU
- Heating levels
- 17K / 25K / 30K / 35K
- Operating modes
- Rapid / Standard / Sleep
- Airflow
- 320 CFM
- Sleep-mode sound
- 40 dB
- Electrical supply
- 12V DC
- Rated input
- 120W / 10A
- Duct outlet size
- 4 in round
- Fuel
- LP propane
Quick answers
Can it be installed vertically?
Yes. Horizontal or vertical mounting is supported when the approved bracket and manual clearances are used.
Will it work with in-floor ducts?
It can work with compatible central ducting when static-pressure and airflow requirements are met.
What door should I choose?
Select the option that matches the installation plan and exterior access arrangement.
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InstaHeat 35K
Checkout code--:--:--
$799.99
$1,299.99
Save $500.00
HIGHER-OUTPUT DUCTED HEAT
Recover fast, then settle in quietly
InstaHeat 35K provides four heating levels from 17K to 35K BTU, 320 CFM airflow and a 40 dB sleep setting. It is built for larger RVs and colder travel where one fixed output forces a compromise between recovery and overnight comfort.
35,000 BTUMaximum heating output
4 heat levels17K / 25K / 30K / 35K
320 CFMCentral-duct airflow
40 dBSleep-mode sound
Use only the heat the cabin needs
The four output levels and three operating modes give the furnace more room to respond to changing cabin demand.
RAPID RECOVERY
Recover quickly with 35K output
Higher maximum output shortens recovery when the heat load, ductwork and propane system are all sized correctly.
FOUR HEAT LEVELS
Step down instead of always running high
The 17K, 25K, 30K and 35K levels help the system match changing cabin demand more closely.
QUIETER NIGHT OPERATION
Maintain comfort in 40 dB sleep mode
Use the lower-output mode to maintain comfort overnight instead of repeatedly calling for maximum recovery.
BUILT-IN PROTECTION
Monitor ignition, flame and airflow
Correct propane, exhaust, return air and 12V installation remain essential to safe heating.
WHO NEEDS 35K?
35K output for larger central-duct RV systems
Four heat levels and up to 320 CFM give larger RVs more recovery and control in colder travel.
A strong fit for larger rigs and colder routes
Choose it when faster recovery and more heat reserve are genuinely needed.
Choose 30K for a more balanced mid-size replacement
The 30K model provides a balanced option for moderate heat loads and lower duct airflow.
Match output to return air and duct capacity
A restricted duct system can undermine performance and create avoidable furnace problems.
Complete 35K furnace-system compatibility
The 35K platform pairs with compatible return air, supply ducts, exhaust, 12V power and LP propane.
FIT AT A GLANCE
Built for larger central-duct RV heating systems.
The four-stage furnace delivers up to 35K BTU and 320 CFM through a compatible return-air and supply-duct layout.
- Heating levels
- 17K / 25K / 30K / 35K
- Airflow
- 320 CFM
- Power supply
- 12V DC
- Rated current
- 10A
- Duct static pressure
- 0.10 in WC
Horizontal or vertical installation is supported; vertical mounting uses the specified bracket and guide clearances.
Match output to the RV and ducts
Compare output with the furnace being replaced and the capacity of the existing duct system.
InstaHeat 35K
For larger rigs, colder travel and owners who need fast recovery plus lower overnight levels.
- Maximum heat
- 35K BTU
- Airflow
- 320 CFM
- Heat levels
- 4
InstaHeat 30K
For many travel trailers and fifth wheels with moderate heat loads.
- Maximum heat
- 30K BTU
- Airflow
- 260 CFM
- Heat levels
- Standard output
InstaHeat 25K
For lighter heat loads and smaller ducted interiors.
- Maximum heat
- 25K BTU
- Airflow
- 240 CFM
- Best for
- Smaller cabins
See installation and heating in action
Cabinet work, vertical mounting and real heating operation in three practical videos.
▶FURNACE REPLACEMENT
See a complete furnace replacement
Cabinet preparation, ducting, propane, 12V wiring and startup.
▶VERTICAL INSTALLATION
See how vertical mounting is supported
Bracket placement, clearances and the details that change with orientation.
▶OWNER REVIEW
See heating operation after installation
A practical look at startup, airflow and cabin heat in an RV.
Quick answers about 35K output, ducts and installation
Clear guidance on heat load, duct capacity, cabinet fit and installation orientation.
Which RVs are a strong fit for 35K?
It is designed for larger RVs, colder routes and central duct systems sized to move up to 320 CFM.
Does it work with central RV ducting?
Yes. It distributes heat through compatible return-air and supply-duct systems.
Can it be installed vertically?
Yes. Use the specified bracket, clearances and orientation instructions in the installation guide.
What do the four heat levels change?
They let the furnace recover at higher output, then step down to maintain comfort more quietly and efficiently.
What does installation require?
A compatible cabinet, exhaust location, return-air area, supply ducts, 12V wiring and LP propane connection.
Ready for higher-output ducted heat?
Select the door option in the buy box. The installation guide is available for final furnace-fit planning.
This product is rated 4.8 of 5.0 stars.
It has received 38 reviews.
We've got you covered, 24/7.
Our customer support is available around the clock, every day of the week.Tel: +1 877 216 1818
Fast & Free Shipping
We get it out within 1 business day. Should be at your door within a week.
Real People. Real Help.
Got questions? We provide tech support over the phone, from setup to everyday use. We're here when you need us.
30-Day Return/Refund
Fogatti offers customers 30-Day returns for exchange or refunds
2 Year Warranty.
We build it tough. But if something fails in the first two years, we'll fix it or swap it out. Simple as that.
Our customer support is available around the clock, every day of the week.Tel: +1 877 216 1818