Flagro FVO-400RC Indirect Fired Heater with Recirculation Hood – 390,000 BTU Heating for Large Spaces
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The Flagro FVO-400RC 390,000 BTU Indirect-Fired Heater delivers high-capacity temporary heating for construction sites, warehouses, and industrial facilities. Featuring a recirculation hood, 4,000 CFM airflow, and a stainless steel heat exchanger, it provides flexible heating with extended ducting capability.
Key Specifications:
- Heating: 390,000 BTU/hr
- Fuel: Diesel, Fuel Oil or Kerosene
- Airflow: 4,000 CFM
- Fuel Tank: 42 Gallons
- Published Runtime: Approximately 14 Hours
- Electrical: 115V / 15A Supply
- Air Outlets: Dual 12″ or Single 16″
- Return-Air Inlet: 16″
- Ducting: Up to 150 Feet
- Weight: 450 lbs
Features: Riello burner, flat-free wheels, power indicator, and optional Tigerloop system.
Nationwide shipping available. Contact us for pricing and availability.
The Flagro FVO-400RC 390,000 BTU Indirect-Fired Heater with Recirculation delivers high-capacity temporary heating for construction sites, warehouses, industrial facilities, and large commercial projects. Featuring 4,000 CFM of airflow, a built-in 42-gallon fuel tank, and a dedicated return-air inlet, this portable oil-fired heater is designed for demanding heating applications.
The FVO-400RC utilizes a fully welded 16-gauge 304 stainless steel heat exchanger to separate normal burner combustion exhaust from the heated supply air. Its recirculation hood allows appropriately ducted return air to be reheated, helping maintain temperatures in temporary structures and commercial facilities.
Equipped with a Riello burner, 1 HP backward-incline blower, and two 16-inch flat-free wheels, the Flagro FVO-400RC combines dependable heating performance with convenient jobsite mobility.
The unit supports approved heated-air duct runs up to 150 feet, making it especially useful for projects where heating equipment must be positioned away from the conditioned space.
Key Features of the Flagro FVO-400RC
- 390,000 BTU/hr Heating Capacity: Provides high-output temporary heating for commercial and industrial applications.
- 4,000 CFM Airflow: Powerful 1 HP blower delivers substantial heated-air circulation.
- Indirect-Fired Heating: Uses a heat exchanger to separate normal combustion exhaust from the heated air.
- Recirculation Hood: Features a 16-inch return-air inlet for compatible recirculating heating installations.
- 42-Gallon Fuel Tank: Integrated onboard fuel storage for temporary heating projects.
- Approximately 14-Hour Runtime: Manufacturer-published operating duration under specified conditions.
- Riello Burner Technology: Includes a nozzle preheater and updated low-temperature fuel pump for cold-weather operation.
- 304 Stainless Steel Heat Exchanger: Fully welded, 16-gauge construction for durability.
- 115V Electrical Operation: Published 10.5A current draw with a 15A electrical supply.
- Flexible Ducting Configurations: Supports dual 12-inch or single 16-inch heated-air outlets.
- Extended Ducting Capability: Approved supply ducting arrangements up to 150 feet.
- Direct Spark Ignition: Automatic burner ignition.
- Flat-Free Wheels: Two 16-inch wheels for portability.
- Smart Power Indicator: Helps verify proper incoming electrical supply.
- Built-In Voltmeter: Allows convenient monitoring of electrical input.
- Optional Tigerloop System: Available for additional fuel-system air management.
- cETLus Listed: Manufacturer-listed safety certification.
Indirect-Fired Heating with Air Recirculation
The Flagro FVO-400RC combines indirect-fired heating technology with a dedicated return-air connection.
Unlike direct-fired heaters that release combustion products into the supplied airflow, the FVO-400RC transfers heat through a stainless steel heat exchanger.
During normal operation, burner exhaust remains separated from the heated air being delivered through the unit’s supply outlets.
The recirculation design allows return air from a conditioned space to be directed back through the heater when installed in an approved configuration.
Benefits of Air Recirculation
- Helps retain previously heated air
- Supports temperature maintenance in temporary structures
- May reduce heating demand and fuel consumption in suitable installations
- Provides additional flexibility for commercial ducting systems
- Allows return air to be reheated rather than relying exclusively on colder outside air
Actual fuel savings depend on the building’s heat loss, ventilation requirements, outdoor temperature, and heater operating conditions.
Important: The heater still requires adequate combustion air and safe exhaust handling. Air recirculation does not eliminate the need for ventilation or proper flue installation.
Common Applications for the Flagro FVO-400RC
Construction Site Heating
Commercial construction projects often require temporary heating during winter conditions, building renovations, and HVAC installation.
The Flagro FVO-400RC delivers 390,000 BTU/hr of heating for appropriately sized construction applications.
Typical uses include:
- Commercial building construction
- Winter construction projects
- Temporary construction enclosures
- Building renovations
- Heating during HVAC equipment installation
- Temporary jobsite heating
Its recirculation capability and extended ducting options provide flexibility for different building layouts.
Warehouses and Industrial Facilities
Warehouses, factories, and industrial facilities may need temporary heating during extreme cold, maintenance shutdowns, or permanent HVAC failures.
The FVO-400RC provides 4,000 CFM of airflow and compatible ducting connections for directing heat into commercial spaces.
For installations with appropriate return-air ductwork, the heater can recirculate previously warmed air.
Temporary Structures and Commercial Tents
The FVO-400RC is suitable for properly designed temporary heating systems serving commercial tents, temporary buildings, and construction shelters.
Its indirect-fired design separates normal combustion exhaust from the heated supply air.
The recirculation inlet can help maintain temperatures in compatible temporary enclosures.
Heater placement, combustion exhaust, fresh-air requirements, return-air ducting, and applicable fire codes must be considered before installation.
Emergency Commercial Heating
The Flagro FVO-400RC can support temporary heating during:
- Commercial HVAC failures
- Planned heating-system maintenance
- Building renovations
- Industrial facility shutdowns
- Winter construction projects
- Temporary heating installations
Explore Commercial Heating Applications
Flagro FVO-400RC Technical Specifications
| Specification | Flagro FVO-400RC |
|---|---|
| Model Number | FVO-400RC |
| Equipment Type | Oil-Fired Indirect Heater with Recirculation |
| Heating Capacity | Up to 390,000 BTU/hr |
| Fuel | No. 1 / No. 2 Fuel Oil, Diesel or Kerosene |
| Fuel Tank Capacity | 42 US Gallons |
| Published Runtime | Approximately 14 Hours |
| Fuel Consumption | Approximately 2.75 GPH |
| Electrical Supply | 115V |
| Manufacturer-Listed Electrical Supply | 15 Amps |
| Operating Current | 10.5 Amps |
| Blower Motor | 1 HP |
| Airflow | 4,000 CFM |
| Burner | Riello |
| Ignition | Direct Spark |
| Heat Exchanger | 16-Gauge 304 Stainless Steel |
| Burner Nozzle | 2.00 × 60B |
| Fuel Pump Pressure | 170 PSI |
| Heated-Air Outlets | Two 12″ or One 16″ |
| Return-Air Inlet | One 16″ |
| Published Supply Ducting Capability | Up to 150 Feet |
| Wheels | Two 16″ Flat-Free |
| Smart Power Indicator | Yes |
| Voltmeter | Yes |
| Optional Fuel System | FVO-TLS Tigerloop |
| Length | 70″ |
| Width | 29″ |
| Height | 54″ |
| Weight | 450 lbs |
| Certification | cETLus |
Specifications are based on Flagro’s published FVO-400RC product information. Confirm current installation requirements, burner configuration, and electrical connections against the equipment nameplate and operating manual.
42-Gallon Fuel Tank and Runtime
The Flagro FVO-400RC includes a 42-gallon onboard fuel tank, making it a practical choice for temporary heating applications where an integrated fuel supply is preferred.
Fuel Specifications
| Specification | Value |
|---|---|
| Tank Capacity | 42 US Gallons |
| Published Runtime | Approximately 14 Hours |
| Fuel Consumption | Approximately 2.75 GPH |
| Approved Fuels | No. 1 / No. 2 Fuel Oil, Diesel or Kerosene |
Runtime depends on available fuel, burner operating conditions, and the actual equipment configuration.
The heater’s recirculation capability may help reduce heating demand in suitable installations, although specific fuel savings are not guaranteed.
For Longer Heating Projects
Customers requiring additional fuel storage can consider the Flagro FVO-400RCBT, which incorporates an approximately 118-gallon bulk fuel tank.
Electrical Requirements
The FVO-400RC operates on 115V electrical power.
The manufacturer lists:
- Electrical Supply: 115V / 15A
- Operating Current: 10.5 Amps
- Blower Motor: 1 HP
- Smart Power Indicator: Included
- Voltmeter: Included
The heater requires a properly rated grounded electrical connection.
Follow the manufacturer’s current installation instructions for receptacle compatibility, circuit protection, and electrical safety.
Supply and Return-Air Ducting
One of the main advantages of the Flagro FVO-400RC is its flexible air-distribution design.
The heater features supply outlets and a dedicated return-air inlet, allowing it to serve appropriately designed temporary ducting systems.
Dual 12-Inch Heated-Air Outlets
The manufacturer identifies a dual 12-inch outlet configuration.
This arrangement allows heated air to be directed through separate supply duct runs when properly installed.
Single 16-Inch Heated-Air Outlet
A single 16-inch heated-air outlet configuration is also listed by Flagro.
Customers should confirm the desired outlet arrangement when ordering.
Single 16-Inch Return-Air Inlet
The FVO-400RC includes a 16-inch return-air connection.
This supports approved recirculating installations that return air from the heated space to the heater.
Extended Ducting Capability
Flagro advertises approved supply ducting arrangements up to 150 feet.
Actual allowable duct lengths depend on the selected outlet configuration, duct diameter, airflow resistance, and installation requirements.
Return-air ducting also has its own restrictions and must follow the manufacturer’s instructions.
Compatible Flagro Accessories
FV-HD12 — 12-Inch × 12-Foot Heated-Air Duct
Compatible with approved 12-inch heated-air outlets.
FV-HDG16 — 16-Inch × 25-Foot Heated-Air Duct
Designed for compatible 16-inch heated-air supply connections.
FV-HDV16 — 16-Inch × 25-Foot Return-Air Duct
Supports suitable installations using the heater’s 16-inch recirculation inlet.
FV-THB — Remote Thermostat
The FV-THB is a manufacturer-listed remote thermostat accessory for controlling the heater.
FVO-TLS — Optional Tigerloop System
The FVO-TLS is an optional fuel-system accessory designed to help address air-lock problems.
Contact Climate Control Solutions for compatible accessories, pricing, and availability.
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Riello Burner Technology
The Flagro FVO-400RC uses Riello oil-burner technology designed for commercial temporary heating.
The manufacturer highlights features including:
- Built-in nozzle preheater for cold-weather startup
- Updated low-temperature fuel pump
- Direct spark ignition
- Optional Tigerloop fuel-system accessory
These components support dependable heating during demanding winter construction applications.
Burner servicing, nozzle replacement, fuel-system maintenance, and combustion adjustments must follow Flagro’s operating instructions.
Durable, Portable Construction
The FVO-400RC is designed for frequent transport and temporary commercial heating installations.
The heater features:
- Rugged commercial cabinet
- Two 16-inch flat-free wheels
- Integrated 42-gallon fuel tank
- Built-in power indicator and voltmeter
- Fully welded stainless steel heat exchanger
The manufacturer lists dimensions of 70 inches long, 29 inches wide, and 54 inches high, with a weight of approximately 450 pounds.
Use appropriate equipment and handling procedures when moving, loading, or transporting the heater.
Safety and Installation Considerations
The Flagro FVO-400RC is commercial indirect-fired heating equipment.
Safe operation requires correct installation and maintenance.
Important considerations include:
- Provide adequate combustion air and ventilation.
- Route burner exhaust safely away from occupied areas.
- Maintain manufacturer-required clearances from combustible materials.
- Use only approved fuel types.
- Inspect the burner and fuel system before operation.
- Provide compatible electrical service.
- Keep heated-air outlets and return-air connections unobstructed.
- Follow the manufacturer’s ducting limitations.
- Position the heater on a stable surface.
- Follow applicable fire, mechanical, fuel-storage, and building codes.
Although indirect-fired heaters separate normal combustion exhaust from the heated air, they must still be installed with adequate ventilation and safe exhaust discharge.
Why Choose the Flagro FVO-400RC?
The Flagro FVO-400RC combines 390,000 BTU/hr heating capacity, 4,000 CFM airflow, and return-air recirculation in a portable commercial heater.
Its stainless steel heat exchanger, Riello burner, built-in fuel tank, and extended ducting capability make it particularly useful for temporary construction and industrial heating installations.
Compared with the standard FVO-400, the FVO-400RC provides higher airflow, a dedicated return-air inlet, and longer approved ducting capability.
Compare Other Flagro Indirect-Fired Heaters
Climate Control Solutions supplies additional Flagro heating equipment:
- Flagro FVO-400: 390,000 BTU indirect-fired heater with 2,500 CFM airflow and no return-air connection.
- Flagro FVO-400RCBT: 390,000 BTU recirculating indirect-fired heater with a larger 118-gallon bulk fuel tank.
- Flagro FVNP-400RC: Propane/natural gas indirect-fired alternative with recirculation.
- Flagro FVO-750: 750,000 BTU oil-fired indirect heater for higher-capacity heating projects.
Explore Commercial Heating Solutions
Frequently Asked Questions About the Flagro FVO-400RC
How much heat does the Flagro FVO-400RC produce?
The heater delivers up to 390,000 BTU/hr of heating capacity.
How much airflow does the FVO-400RC provide?
The manufacturer specifies 4,000 CFM with a 1 HP blower motor.
What fuel does the FVO-400RC use?
The heater operates on manufacturer-approved No. 1 or No. 2 fuel oil, diesel, or kerosene.
How large is the fuel tank?
The FVO-400RC features a built-in 42-gallon fuel tank.
How long can the heater run on a full tank?
Flagro publishes approximately 14 hours of runtime. Actual operating time depends on fuel availability and heating demand.
What is the benefit of the recirculation hood?
The recirculation hood allows compatible return-air ducting to direct previously heated air back through the heater, potentially reducing the heating load in suitable installations.
What is the difference between the FVO-400 and FVO-400RC?
Both deliver up to 390,000 BTU/hr of heat. The FVO-400 provides 2,500 CFM, while the FVO-400RC provides 4,000 CFM and adds return-air recirculation and longer ducting capability.
What is the difference between the FVO-400RC and FVO-400RCBT?
The FVO-400RC has a 42-gallon fuel tank. The FVO-400RCBT features a larger 118-gallon bulk fuel tank for extended operation.
What electrical power is required?
The heater operates on 115V electrical power with a manufacturer-listed 15A supply and approximately 10.5A operating current.
What size heated-air ducting can be used?
The manufacturer lists dual 12-inch or single 16-inch heated-air outlet configurations.
Does the FVO-400RC have a return-air connection?
Yes. The heater includes a single 16-inch return-air inlet.
How much ducting can the heater support?
Flagro advertises heated-air ducting configurations up to 150 feet, subject to installation limits.
Does the FVO-400RC include a remote thermostat?
The FV-THB remote thermostat is a manufacturer-listed accessory. Confirm whether it is included in the quoted package.
Does the heater include the Tigerloop system?
The Tigerloop system is an optional accessory, not standard equipment.
Request a Quote for the Flagro FVO-400RC
Climate Control Solutions supplies Flagro indirect-fired heaters, oil-fired construction heaters, and commercial temporary heating equipment nationwide.
Whether you need one FVO-400RC for a construction project or multiple heaters for an industrial facility, our team can assist with equipment selection, ducting configurations, fuel requirements, and freight arrangements.
Contact Climate Control Solutions for current pricing and availability.
Phone: (800) 633-8711
Email: [email protected]
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