✅ This item is normally regularly stocked. Shipping times may vary depending on availability. Please contact us to confirm stock and shipping times. You will receive tracking details once the item has shipped.
Description
Flagro FVO-400 Oil-Fired Indirect Heater – 390,000 BTU of Clean, Dry Heat
Heavy-Duty 390,000 BTU Indirect-Fired Heating for Commercial & Industrial Needs
The Flagro FVO-400 is a high-performance oil-fired indirect heater engineered to deliver 390,000 BTU/hour of clean, dry heat—ideal for construction sites, restoration work, tent heating, and large industrial spaces. Built with a rugged 304 stainless steel heat exchanger, advanced Riello burner, and 42-gallon onboard fuel tank, this unit offers reliable, high-capacity heat in even the harshest environments.
When you're facing -40°C conditions or heating a large warehouse, the Flagro FVO-400 is engineered to deliver long run times, quiet operation, and minimal maintenance.
Why Choose the Flagro FVO-400?
390,000 BTU of Heating Power
- Powerful indirect-fired output that keeps job sites warm and dry without introducing fumes or moisture into the space.
- Ideal for heating up to 8,000+ sq ft, depending on insulation and conditions.
Advanced Riello Burner System
- Field-proven Riello burner for dependable ignition.
- Features a nozzle pre-heater and low-temp fuel pump for cold-weather startups.
- Burner includes LED diagnostics, a self-cleaning flame sensor, and factory-set compatibility with No.1 or No.2 fuel oil.
304 Stainless Steel Welded Heat Exchanger
- Built from 16-gauge 304 stainless steel for maximum corrosion resistance and long life.
- Welded seams eliminate heat loss and improve transfer efficiency.
42-Gallon Onboard Fuel Tank
- Provides up to 16 hours of runtime at full output.
- Equipped with a fuel filter, quick-drain plug, and water separator for field reliability.
Jobsite-Ready Design
- Flat-free 16” wheels and forklift pockets for mobility.
- Compact footprint (70” x 29”) fits easily into trailers and tight work zones.
- Powder-coated steel cabinet resists weather, corrosion, and impacts.
Flexible Ducting & Airflow
- Supports dual 12” or single 16” duct configuration, ductable up to 50 feet.
- 2,500 CFM blower ensures fast, even heat distribution.
- Optional accessories: FV-HD12, FV-HDG16, and FV-THB remote thermostat.
Applications
The Flagro FVO-400 oil indirect heater is trusted across North America for:
- Construction heating
- Temporary shelter & tent heating
- Disaster recovery & emergency response
- Industrial drying & dehumidification
- Oil & gas sites, military use, and modular builds
- Event and warehouse heating
Specifications
| Specification | Details |
|---|---|
| Heat Output | 390,000 BTU/hr |
| Fuel Type | No.1 / No.2 Fuel Oil |
| Fuel Tank Capacity | 42 US gallons |
| Run Time at Full Fire | Up to 16 hours |
| Fuel Consumption | ~2.7 gal/hr |
| Power Requirements | 115V / 15A (10.5A draw) |
| Blower Output | 2,500 CFM via 3/4 HP motor |
| Heat Exchanger | 16-gauge 304 stainless steel |
| Ignition | Direct Spark |
| Air Outlet | 2 x 12" or 1 x 16" |
| Wheels | 2 x 16” High-Density Flat-Free |
| Dimensions / Weight | 70” x 29” x 52” / 450 lbs |
| Certifications | cETLus |
Accessories & Options
- FV-HD12 — 12” x 12’ flexible duct
- FV-HDG16 — 16” x 25’ flexible duct
- FV-THB — Remote thermostat
- FVO-TLS — Optional Tigerloop System for fuel management
Order the Flagro FVO-400 Oil Indirect Fired Heater Today
Don’t settle for weak heat or unreliable startup in cold weather. The Flagro FVO-400 oil-fired indirect heater is your solution for powerful, clean, and safe heating on demanding job sites.
👉 Browse all Flagro heaters at Cleanflow
Frequently Asked Questions
Is 390,000 BTU enough for a large space?
Yes. The Flagro FVO-400 is rated to heat 8,000+ sq ft, depending on insulation, ceiling height, and environmental conditions.
Can it run on generator power?
Absolutely. The unit draws just 10.5 amps, making it fully compatible with jobsite or backup generators.
Is the remote thermostat plug-and-play?
Yes. The FV-THB thermostat plugs directly into the control panel and allows remote temperature control up to 50 feet away.
How difficult is maintenance?
Designed for jobsite serviceability with easy access to components, a slide-out burner, and simple diagnostics.
What’s the difference between the Flagro FVO-400 and the Flagro FVNP-400?
The FVO-400 uses oil (diesel/#2 fuel) and includes a 42-gallon onboard tank; the FVNP-400 is a dual-fuel model (propane or natural gas) without the built-in tank, offering cleaner emissions for indoor or semi-enclosed use.
👉 Need help sizing your heater? Use our BTU Calculator to determine the right capacity for your space.
✅ This item is normally regularly stocked. Shipping times may vary depending on availability. Please contact us to confirm stock and shipping times. You will receive tracking details once the item has shipped.
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