Flagro FVO-400 RCBT Indirect Fired Heater with Recirculation Hood – 390,000 BTU Heating for Large Spaces
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The Flagro FVO-400RCBT 390,000 BTU Bulk Tank Indirect-Fired Heater provides extended-runtime heating for construction projects, warehouses, and industrial facilities. Its integrated 118-gallon fuel tank, recirculation capability, and stainless steel heat exchanger make it ideal for demanding temporary heating applications.
Key Specifications:
- Heating: 390,000 BTU/hr
- Fuel: Diesel, Fuel Oil, or Kerosene
- Fuel Tank: 118 Gallons
- Runtime: Approximately 43–44 Hours
- Airflow: 4,000 CFM
- Electrical: 115V / 15A Supply
- Heat Exchanger: 16-Gauge 304 Stainless Steel
- Ducting: Up to 150 Feet (Approved Configurations)
Features: Riello burner, Tigerloop fuel system, 16″ return-air inlet, and skid-mounted construction.
Nationwide shipping available. Contact us for pricing and availability.
The Flagro FVO-400RCBT 390,000 BTU Bulk Tank Indirect-Fired Heater delivers high-capacity temporary heating for construction sites, warehouses, industrial facilities, and large commercial projects. Featuring a 118-gallon integrated fuel tank, this heater is designed for extended operation without the frequent refueling associated with smaller portable heaters.
The FVO-400RCBT produces up to 390,000 BTU/hr of heating capacity and 4,000 CFM of airflow, making it suitable for demanding temporary heating applications.
Its indirect-fired design incorporates a fully welded 16-gauge 304 stainless steel heat exchanger that separates combustion exhaust from the heated supply air during normal operation.
The heater also features a recirculating air inlet, proven Riello burner technology, a low-amperage backward-incline blower, and a Tigerloop fuel system designed to help prevent fuel-system air locks.
With the ability to support approved ducting configurations up to 150 feet, the Flagro FVO-400RCBT provides flexible heating for large commercial and industrial environments.
Key Features of the Flagro FVO-400RCBT
- 390,000 BTU/hr Heating Capacity: Provides powerful temporary heating for commercial and industrial applications.
- 118-Gallon Bulk Fuel Tank: Supports extended operation without frequent refueling.
- Approximately 43–44 Hours of Runtime: Manufacturer-published operation at rated conditions.
- 4,000 CFM Airflow: Distributes large volumes of heated air through compatible ducting.
- Indirect-Fired Heating: Separates normal combustion exhaust from heated supply air.
- Recirculation Capability: Features a 16-inch return-air inlet for approved recirculating installations.
- Riello Burner Technology: Includes cold-weather startup features such as a nozzle preheater and low-temperature fuel pump.
- 304 Stainless Steel Heat Exchanger: Fully welded, 16-gauge construction for durability.
- Tigerloop Fuel System: Helps eliminate fuel-system air locks.
- 115V Electrical Operation: Manufacturer lists 10.5A operating current and a 15A electrical supply.
- Flexible Heated-Air Distribution: Supports approved ducting arrangements up to 150 feet.
- Smart Power Indicator: Helps operators verify proper incoming power.
- Built-In Voltmeter: Provides convenient electrical monitoring.
- Skid-Mounted Construction: Designed for temporary commercial heating installations.
- cETLus Listed: Manufacturer-listed safety approval.
Extended Runtime with a 118-Gallon Fuel Tank
One of the primary advantages of the Flagro FVO-400RCBT is its integrated bulk fuel tank.
While the standard FVO-400RC features a smaller fuel tank, the bulk-tank configuration increases onboard fuel storage to 118 US gallons.
This allows the heater to operate for extended periods without frequent refueling.
Published Fuel Specifications
| Specification | Value |
|---|---|
| Fuel Tank Capacity | 118 US Gallons |
| Fuel Consumption | Approximately 2.75 GPH |
| Published Runtime | Approximately 43–44 Hours |
| Fuel Type | Approved Fuel Oil, Diesel, or Kerosene |
Actual runtime varies depending on burner configuration, available fuel, and operating conditions.
Benefits of the Bulk-Tank Configuration
- Reduces the frequency of refueling
- Supports extended temporary heating projects
- Provides integrated fuel storage
- Simplifies fuel management compared with separate tanks
- Useful for construction projects requiring long operating periods
The fuel system must be operated and maintained according to Flagro’s instructions.
Indirect-Fired Heating Technology
The FVO-400RCBT uses an indirect-fired heating system.
Unlike direct-fired heaters, which release combustion products into the heated airflow, an indirect-fired heater transfers heat through a heat exchanger.
The FVO-400RCBT features a fully welded 16-gauge 304 stainless steel heat exchanger.
During normal operation, the exchanger separates burner combustion gases from the heated supply air.
This provides several advantages for temporary commercial heating:
- Separates combustion exhaust from supplied heated air
- Avoids directly adding combustion moisture to the conditioned airflow
- Supports ducted heating applications
- Provides high-capacity heat for temporary structures and industrial facilities
Important: Combustion exhaust must still be safely vented outdoors, and the installation must provide adequate combustion air and manufacturer-required clearances.
Recirculation Hood for Improved Heating Performance
The FVO-400RCBT includes a recirculation configuration with a 16-inch return-air inlet.
Instead of relying exclusively on outdoor or surrounding air, an approved return-air arrangement can direct air from the heated space back to the heater.
This can help maintain temperatures and reduce the heating load in appropriately designed installations.
Benefits of Air Recirculation
- Helps retain previously heated air
- Supports temperature management
- May reduce fuel consumption depending on operating conditions
- Provides flexibility for temporary commercial heating systems
All return-air ducting must follow Flagro’s airflow, temperature, and installation requirements.
Common Applications for the Flagro FVO-400RCBT
Construction Site Heating
Commercial construction projects often require reliable temporary heating during winter conditions and building renovations.
The FVO-400RCBT provides high-capacity heat with extended onboard fuel storage.
Common applications include:
- Winter construction projects
- Commercial building renovations
- Temporary construction enclosures
- Heating during HVAC installation
- Industrial construction projects
- Building maintenance operations
Its bulk tank can be particularly useful when frequent refueling is inconvenient.
Warehouses and Industrial Facilities
Warehouses, factories, and industrial facilities may require supplemental heating during extreme cold, HVAC outages, or planned maintenance.
With 390,000 BTU/hr of heating capacity and 4,000 CFM of airflow, the FVO-400RCBT can support appropriately sized temporary heating applications.
Compatible ducting allows heated air to be delivered to specific areas or multiple distribution points.
Temporary Structures and Commercial Tents
The indirect-fired design makes the heater suitable for appropriately engineered commercial tent and temporary structure heating systems.
The heat exchanger separates normal combustion exhaust from the heated air stream.
Heater placement, ventilation, flue exhaust, ducting, and occupancy requirements must be evaluated before operation.
Emergency and Temporary HVAC Applications
The Flagro FVO-400RCBT can provide temporary commercial heating during:
- Permanent HVAC equipment failures
- Planned heating-system shutdowns
- Building renovations
- Industrial maintenance projects
- Winter construction
- Emergency heating requirements
Explore Commercial Heating Applications
Flagro FVO-400RCBT Technical Specifications
| Specification | Flagro FVO-400RCBT |
|---|---|
| Model Number | FVO-400RCBT |
| Equipment Type | Bulk-Tank Indirect-Fired Heater |
| Heating Capacity | Up to 390,000 BTU/hr |
| Fuel | No. 1 / No. 2 Fuel Oil, Diesel, or Kerosene |
| Fuel Tank Capacity | 118 US Gallons |
| Published Fuel Consumption | 2.75 GPH |
| Published Runtime | Approximately 43–44 Hours |
| Electrical Supply | 115V / 15A |
| Operating Current | 10.5 Amps |
| Fan Motor | 1 HP |
| Airflow | 4,000 CFM |
| Burner | Riello |
| Ignition | Direct Spark |
| Burner Nozzle | 2.00 × 60B |
| Fuel Pump Pressure | 170 PSI |
| Heat Exchanger | 16-Gauge 304 Stainless Steel |
| Air Outlet | Dual 12″ or Single 16″ Configuration |
| Additional Outlet Configuration | Single 20″ Listed in Select Documentation |
| Return-Air Inlet | Single 16″ |
| Maximum Published Ducting | Up to 150 Feet, Configuration-Dependent |
| Fuel System | Tigerloop |
| Smart Power Indicator | Yes |
| Voltmeter | Yes |
| Mounting | Skid Base |
| Dimensions — Manufacturer Online Listing | 71″ L × 33″ W × 73″ H |
| Weight — Manufacturer Online Listing | 850 lbs |
| Certification | cETLus |
Specifications are based on Flagro’s published product listing. A separate manufacturer sales sheet lists different overall dimensions, weight, and standard outlet configuration. Confirm the specifications of the actual supplied unit before ordering or planning freight.
Electrical Requirements
The Flagro FVO-400RCBT operates on 115V electrical power.
The manufacturer lists:
- Electrical Supply: 115V / 15A
- Operating Current: 10.5 Amps
- Fan Motor: 1 HP
- Smart Power Indicator: Included
- Voltmeter: Included
The electrical circuit must meet the manufacturer’s requirements.
Confirm the plug, receptacle, circuit protection, and supply conditions against the equipment nameplate and installation manual.
Heater Ducting and Air Distribution
The FVO-400RCBT supports several heated-air distribution configurations.
Flagro identifies the following arrangements in its product documentation:
- Dual 12-inch heated-air outlets
- Single 16-inch heated-air outlet
- Single 20-inch outlet in select configurations
- Single 16-inch return-air inlet
The precise standard outlet configuration should be confirmed when ordering.
Extended Ducting
Flagro advertises the heater as ductable up to 150 feet, subject to its approved ducting configuration and installation limitations.
This makes the FVO-400RCBT useful for temporary heating projects where the heater must be positioned away from the conditioned area.
Compatible Ducting Accessories
FV-HD12 — 12-Inch Heated-Air Duct
Compatible with appropriate 12-inch supply-air connections.
FV-HD12x25 — 12-Inch × 25-Foot Heated-Air Duct
Used for approved extended supply ducting arrangements.
FV-HDG16 — 16-Inch × 25-Foot Heated-Air Duct
Compatible with approved 16-inch heated-air connections.
FV-HDV16 — 16-Inch Return-Air Duct
Designed for suitable return-air configurations.
Ducting must be installed without exceeding the manufacturer’s airflow restrictions or allowable lengths.
Riello Burner and Tigerloop Fuel System
The Flagro FVO-400RCBT features proven Riello oil-burner technology.
Manufacturer-identified features include:
- Nozzle preheater for cold-weather startup
- Updated low-temperature fuel pump
- Direct spark ignition
- Tigerloop fuel system
The Tigerloop system helps remove air from the fuel circuit to reduce fuel-system air-lock issues.
These features are useful for temporary heating equipment operating during cold-weather construction projects.
Skid-Mounted Construction
The FVO-400RCBT uses a skid-mounted configuration designed for commercial heating installations.
The integrated bulk fuel tank increases equipment size and weight compared with the smaller standard FVO-400RC.
Flagro’s online product listing identifies dimensions of approximately:
- Length: 71 inches
- Width: 33 inches
- Height: 73 inches
- Weight: 850 pounds
Confirm lifting points, loaded fuel weight, and equipment dimensions before arranging transportation or jobsite handling.
Safety and Installation Requirements
The FVO-400RCBT is commercial indirect-fired heating equipment and must be operated according to Flagro’s instructions.
Important considerations include:
- Provide adequate combustion air and ventilation.
- Route combustion exhaust safely away from occupied areas.
- Maintain required clearances from combustible materials.
- Use only manufacturer-approved fuels.
- Inspect the fuel system and burner before operation.
- Confirm properly rated electrical service.
- Avoid obstructing heated-air discharge or return-air connections.
- Use only compatible ducting within published limits.
- Place the heater on a stable, suitable surface.
- Follow all applicable fire, fuel-storage, and mechanical regulations.
Indirect-fired heating does not eliminate the need for safe combustion exhaust management.
Why Choose the Flagro FVO-400RCBT?
The Flagro FVO-400RCBT combines high-capacity indirect-fired heating with a larger onboard fuel supply.
Its 390,000 BTU/hr heating capacity, 4,000 CFM blower, 118-gallon bulk tank, and approximately 43–44-hour published runtime make it useful for extended temporary heating projects.
The recirculation system, stainless steel heat exchanger, Riello burner, and flexible ducting arrangements offer additional versatility for commercial and industrial applications.
Compare Other Flagro Indirect-Fired Heaters
Climate Control Solutions offers additional commercial heating options:
- Flagro FVO-400RC: 390,000 BTU indirect-fired heater with recirculation and a smaller 42-gallon fuel tank.
- Flagro FVO-400LTRC: Trailer-mounted heating system with integrated generator and light tower.
- Flagro FVO-750: 750,000 BTU skid-mounted oil-fired indirect heater.
- Explore Commercial Heating Applications
Frequently Asked Questions About the Flagro FVO-400RCBT
How much heat does the FVO-400RCBT produce?
The FVO-400RCBT delivers up to 390,000 BTU/hr of heating capacity.
How large is the fuel tank?
The heater includes a 118 US gallon bulk fuel tank.
How long can the FVO-400RCBT run on a full tank?
Flagro publishes approximately 43–44 hours of runtime under rated operating conditions. Actual runtime varies with burner demand and fuel availability.
What fuel does the FVO-400RCBT use?
The heater operates on manufacturer-approved No. 1 or No. 2 fuel oil, diesel, or kerosene.
How much fuel does the heater consume?
Flagro lists approximately 2.75 gallons per hour at rated operation.
What is the difference between FVO-400RC and FVO-400RCBT?
Both offer approximately 390,000 BTU/hr of indirect-fired heating with recirculation.
The FVO-400RCBT features a much larger 118-gallon bulk fuel tank, compared with the standard FVO-400RC’s 42-gallon tank.
Does the FVO-400RCBT support return-air recirculation?
Yes. The unit includes a 16-inch return-air inlet.
How much airflow does it provide?
The manufacturer specifies 4,000 CFM of airflow.
What electrical power does the heater require?
The manufacturer lists 115V / 15A electrical service, with an operating current of approximately 10.5 amps.
What ducting can be used?
Flagro identifies compatible 12-inch and 16-inch supply ducting, along with 16-inch return-air ducting.
The manufacturer advertises ducting capability up to 150 feet under approved configurations.
Does the heater include a Tigerloop system?
Yes. Flagro identifies the Tigerloop fuel system as a feature of the FVO-400RCBT.
Is the FVO-400RCBT suitable for temporary commercial heating?
Yes. It can support appropriately designed construction, industrial, and temporary heating installations where fuel, electrical, ventilation, and safety requirements are met.
Request a Quote for the Flagro FVO-400RCBT
Climate Control Solutions supplies Flagro indirect-fired heaters, oil-fired construction heaters, and commercial temporary heating equipment nationwide.
Whether you need one FVO-400RCBT for an extended construction project or multiple units for an industrial facility, our team can help with heater sizing, ducting, fuel requirements, and shipping.
Contact Climate Control Solutions for current pricing and availability.
Phone: (800) 633-8711
Email: [email protected]
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