Flagro Indirect-Fired Heaters | Safe, Clean Heat in Canada

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:

Clean Heat: No combustion gases enter your workspace
CSA Certified: Meets Canadian safety standards for indoor use
Durable Construction: Built with 304 stainless steel heat exchangers
Extended Ducting: Heat multiple zones up to 200 feet away
Fuel Flexibility: Available in propane, natural gas, and oil models
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:

Concrete curing in cold weather conditions
Temporary building enclosures and work tents
Equipment protection during harsh winters
Worker comfort in unheated structures

Why Contractors Choose Flagro:

Reliable cold-weather starting
Extended runtime capabilities
Easy transport with integrated fork pockets
Compliance with construction safety standards

Agriculture & Food Processing

Perfect for maintaining optimal conditions in:

Livestock barns and poultry houses
Grain drying operations
Greenhouse heating
Equipment storage buildings

Agricultural Benefits:

Clean, fume-free air for animal health
Consistent temperature control
Reduced moisture and condensation
Energy-efficient operation

Manufacturing & Industrial

Ideal for heating:

Warehouses and distribution centers
Manufacturing facilities
Paint booths and coating operations
Maintenance workshops

Industrial Advantages:

High-capacity heating for large spaces
Extended duct runs for zone heating
Dual fuel flexibility
Minimal maintenance requirements

Oil, Gas & Mining

Essential for:

Worker shelters in remote locations
Equipment protection and maintenance
Pipeline construction heating
Camp and facility heating

Remote Site Benefits:

Diesel fuel compatibility
Rugged construction for harsh conditions
Portable design for site mobility
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

Cleanest burning option with the lowest emissions
Continuous supply through utility connections
Most cost-effective for permanent installations
Immediate availability without storage concerns

Propane

Maximum portability with cylinder or bulk tank options
Excellent cold-weather performance
Quick-connect compatibility
Ideal for remote locations without gas utilities

Diesel/Oil

Highest energy density for extended runtime
Built-in fuel tanks for self-contained operation
Compatible with existing fuel infrastructure
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:

Site requirements and fuel availability
Cost considerations
Environmental regulations
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:

Sealed combustion chambers prevent gas leaks
External venting removes all combustion byproducts
Smart controls with power indicators
Thermal overload protection
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:

Well-insulated building: 0.8-1.0
Moderately insulated: 1.5-2.0
Poorly insulated/leaky: 2.5-3.5

Example Calculation:

Small Workshop: 30' × 20' × 12' = 7,200 ft³

Temperature rise needed: 50°F (from 20°F to 70°F)
Insulation: Moderate (factor = 1.5)
BTUs needed: 7,200 × 50 × 1.5 = 540,000 BTU/hr

Recommended model: Flagro FVNP-750 for reliable performance with a safety margin.

👉 Save time and avoid manual calculations by using our free BTU calculator tool. Quickly find the ideal heater size for your space here: Cleanflow BTU Calculator.

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.

Flagro - Indirect Fired Heaters