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Flagro Indirect-Fired Heaters for Safe, Clean Heat in Canada
Finding the right heating solution for your construction site, warehouse, or agricultural facility shouldn't be complicated. Flagro indirect-fired heaters deliver clean, dry, fume-free heat that keeps your operations running smoothly even in Canada's harshest winter conditions.
What Are Indirect-Fired Heaters?
An indirect-fired heater burns fuel in a sealed combustion chamber, then transfers that heat through a heat exchanger to warm the air that circulates into your space. Unlike direct-fired heaters, all combustion gases are safely vented outside, ensuring clean air for workers and sensitive equipment.
This technology makes indirect-fired heaters essential for enclosed spaces, where air quality matters from construction sites to livestock barns to event tents.
Why Choose Flagro Heaters?
Founded in 1978, Flagro has been manufacturing durable heating solutions in North America for over 40 years. Their indirect-fired heaters are built to withstand demanding environments while delivering consistent, reliable performance.
Benefits of Flagro Heaters:
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Clean Heat: No combustion gases enter your workspace
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CSA Certified: Meets Canadian safety standards for indoor use
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Durable Construction: Built with 304 stainless steel heat exchangers
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Extended Ducting: Heat multiple zones up to 200 feet away
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Fuel Flexibility: Available in propane, natural gas, and oil models
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Cold Weather Reliable: Advanced Riello burner technology ensures start-up even in extreme cold
Industry Applications: Where Flagro Heaters Excel
Construction & Infrastructure
Flagro indirect-fired heaters are essential for:
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Concrete curing in cold weather conditions
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Temporary building enclosures and work tents
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Equipment protection during harsh winters
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Worker comfort in unheated structures
Why Contractors Choose Flagro:
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Reliable cold-weather starting
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Extended runtime capabilities
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Easy transport with integrated fork pockets
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Compliance with construction safety standards
Agriculture & Food Processing
Perfect for maintaining optimal conditions in:
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Livestock barns and poultry houses
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Grain drying operations
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Greenhouse heating
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Equipment storage buildings
Agricultural Benefits:
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Clean, fume-free air for animal health
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Consistent temperature control
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Reduced moisture and condensation
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Energy-efficient operation
Manufacturing & Industrial
Ideal for heating:
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Warehouses and distribution centers
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Manufacturing facilities
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Paint booths and coating operations
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Maintenance workshops
Industrial Advantages:
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High-capacity heating for large spaces
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Extended duct runs for zone heating
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Dual fuel flexibility
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Minimal maintenance requirements
Oil, Gas & Mining
Essential for:
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Worker shelters in remote locations
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Equipment protection and maintenance
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Pipeline construction heating
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Camp and facility heating
Remote Site Benefits:
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Diesel fuel compatibility
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Rugged construction for harsh conditions
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Portable design for site mobility
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Reliable performance in extreme temperatures
Flagro Model Lineup: Find Your Perfect Heater
Flagro FVNP-750 - Maximum Power
750,000 BTU/hr | Propane/Natural Gas
For large-scale heating needs, the FVNP-750 delivers impressive power with dual fuel capability. Features advanced Riello burner technology, VFD-controlled fan motor, and capability for ducting up to 200 feet.
Ideal for: Major construction sites, large warehouses, industrial facilities
Flagro FVO-750 - Oil-Powered Reliability
750,000 BTU/hr | Oil/Diesel
Built for demanding environments, the FVO-750 features a 16-gauge stainless steel heat exchanger, Tiger Loop fuel system, and high-static blower for extended ducting runs.
Ideal for: Remote construction sites, off-grid locations, heavy industrial use
Flagro FVNP-400 - Versatile Mid-Range Option
390,000 BTU/hr | Propane/Natural Gas
Perfect balance of power and portability. The FVNP-400 features ultra-quiet operation, smart controls with power indicators, and a dual fuel selector valve for maximum flexibility.
Ideal for: Medium construction sites, agricultural barns, event venues
Flagro FVNP-400RC - Recirculating Hood Design
390,000 BTU/hr | Propane/Natural Gas
Enhanced with a recirculating hood for improved efficiency, the Flagro FVNP-400RC features a cold-weather pre-heater and upgraded fuel pump to ensure reliable start-up in harsh conditions.
Ideal for: Sites requiring maximum fuel efficiency, cold climate applications
Flagro FVO-400 - Portable Oil Solution
390,000 BTU/hr | Oil/Diesel
The Flagro FVO-400 features a built-in 42-gallon fuel tank, providing up to 14 hours of continuous runtime. With advanced Riello burner technology, this model ensures consistent and reliable performance in cold weather, making it ideal for mobile heating needs and locations without gas connections.
Ideal for: Mobile heating needs, locations without gas connections
Flagro FVNP-200RC - Compact Power
185,000 BTU/hr | Propane/Natural Gas
The Flagro FVNP-200RC is designed for small to medium workshops, retail spaces, and barns. Offering ultra-quiet operation with a stackable frame design, it uses proven Riello burner technology and a cold-weather pre-heater, guaranteeing dependable performance in extreme Canadian conditions.
Ideal for: Small to medium workshops, retail spaces, and smaller barns
Fuel Options and Efficiency
Natural Gas
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Cleanest burning option with the lowest emissions
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Continuous supply through utility connections
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Most cost-effective for permanent installations
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Immediate availability without storage concerns
Propane
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Maximum portability with cylinder or bulk tank options
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Excellent cold-weather performance
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Quick-connect compatibility
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Ideal for remote locations without gas utilities
Diesel/Oil
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Highest energy density for extended runtime
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Built-in fuel tanks for self-contained operation
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Compatible with existing fuel infrastructure
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Excellent for remote or off-grid applications
Dual-Fuel Models
Many Flagro units offer dual fuel capability, allowing quick conversion between fuel types based on:
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Site requirements and fuel availability
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Cost considerations
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Environmental regulations
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Operational flexibility
Safety and Compliance
All Flagro indirect-fired heaters are cETLus certified and meet Canadian safety standards. They're designed for safe indoor use when properly installed and vented according to manufacturer specifications.
Key Safety Features:
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Sealed combustion chambers prevent gas leaks
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External venting removes all combustion byproducts
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Smart controls with power indicators
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Thermal overload protection
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CSA-approved fuel connections
How to Size Your Flagro Heater
Proper sizing ensures efficient operation and adequate heating. Use this industry-standard formula:
BTUs Required = Volume (ft³) × Temperature Rise (°F) × Insulation Factor
Insulation Factors:
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Well-insulated building: 0.8-1.0
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Moderately insulated: 1.5-2.0
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Poorly insulated/leaky: 2.5-3.5
Example Calculation:
Small Workshop: 30' × 20' × 12' = 7,200 ft³
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Temperature rise needed: 50°F (from 20°F to 70°F)
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Insulation: Moderate (factor = 1.5)
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BTUs needed: 7,200 × 50 × 1.5 = 540,000 BTU/hr
Recommended model: Flagro FVNP-750 for reliable performance with a safety margin.
Get Your Flagro Heater Today
Ready to experience reliable, clean heating for your operation? Browse our complete selection of Flagro heaters or explore all indirect-fired heating options.
Need help choosing the right model? Our heating specialists are ready to help you find the perfect solution for your specific needs.
Free shipping on orders over $199 across Canada, with fast delivery to keep your projects on schedule.
Frequently Asked Questions
What is an indirect-fired heater?
An indirect-fired heater burns fuel in a sealed combustion chamber and transfers heat through a heat exchanger, delivering clean air without combustion byproducts. This makes them safe for enclosed spaces where people work.
How long do Flagro heaters last?
With proper maintenance, Flagro heaters are built to last for years of heavy use. The 304 stainless steel heat exchangers and quality Riello burners ensure durability even in harsh conditions.
What is Flagro used for?
Flagro heaters provide temporary heating solutions for construction, commercial, and industrial sectors. They're ideal for job sites, warehouses, barns, event spaces, and any application requiring clean, reliable heat.
What's the difference between direct and indirect heating?
Indirect heaters process air through a heat exchanger, delivering clean, dry air. Direct heaters mix combustion gases with heated air, which can introduce moisture and fumes into the workspace.
Can indirect-fired heaters be used in poorly ventilated areas?
Yes! Indirect-fired heaters are specifically designed for enclosed or poorly ventilated areas because combustion gases are contained and vented outside, while only clean heated air enters the space.
Why choose indirect-fired heaters for construction?
Indirect-fired heaters provide dry, clean heat without adding humidity, perfect for concrete curing, paint drying, and maintaining consistent work conditions without compromising air quality.