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Indirect Fired Heaters
38 products
Showing 1 - 24 of 38 products
Indirect Fired Heaters Canada – Clean, Safe Jobsite Heat
When your worksite demands clean, breathable air, indirect-fired heaters are the only choice. At Cleanflow, we offer a top-tier selection of industrial indirect-fired heaters designed to deliver clean, dry, and fume-free heat for construction, industrial, and commercial settings across Canada.
These heaters are essential for enclosed spaces or areas with limited ventilation where air quality is crucial. By using a heat exchanger, they separate the combustion exhaust from the clean air being circulated, ensuring the safety of your crew and the integrity of your materials.
Featuring cutting-edge technology and rugged durability from trusted brands like Heatstar, Flagro, and Frost Fighter, our heaters deliver high performance safely and efficiently.
What is an Indirect Fired Heater?
An indirect-fired heater is a type of space heater that uses a heat exchanger to warm the air. The fuel (like diesel, propane, or natural gas) is burned in a sealed combustion chamber. The heat produced is transferred to the air blown across the outside of the chamber, but the exhaust fumes are vented separately.
This process ensures that only 100% clean, dry, breathable air is circulated into your space, making it the safest heating solution for indoor and poorly ventilated areas.
Direct vs. Indirect Fired Heater: What's the Difference?
- Direct Fired Heater: Burns fuel directly in the airstream being heated. It is highly efficient but releases combustion byproducts (like carbon monoxide and water vapor) into the space. Best for open, well-ventilated outdoor areas.
- Indirect Fired Heater: Keeps the flame and exhaust gases separate from the clean air it distributes. This makes it the only safe choice for enclosed spaces, occupied work sites, and applications where air quality is critical.
Why Choose Indirect Fired Heaters from Cleanflow?
Cleanflow is your trusted Canadian supplier for CSA-certified and job-site-ready heating solutions. We understand the demands of harsh weather and the need for reliable equipment.
- Safe for Indoor & Enclosed Spaces: A key difference when considering a direct vs indirect fired heater is safety. Our indirect models use a heat exchanger to keep combustion exhaust separate from the heated air, delivering 100% clean, breathable warmth. This makes them perfect for occupied areas, workshops, and event tents.
- Built for Tough Canadian Jobsites: Our heaters are constructed with rugged, heavy-duty materials, including stainless steel heat exchangers and durable frames, to withstand demanding industrial environments.
- Versatile Fuel Options: We offer a range of fuel types to match your operational needs, including indirect diesel heaters, propane, natural gas, and dual-fuel models for maximum flexibility on any site.
- High-Efficiency Performance: With powerful heat outputs up to 750,000 BTU/hr, our heaters are designed for large-scale applications. Many models, like the Flagro FVO-400RC, feature recirculation hoods to optimize fuel consumption and lower operating costs.
- Portable and Easy to Deploy: Designed for mobility, many of our heaters feature pneumatic wheels, forklift pockets, and lifting bails for easy transport and setup across your worksite.
Our Top Brands for Indirect Fired Heaters
Cleanflow is proud to be a premier supplier of North America’s leading heater brands. Each is selected for its proven performance, durability, and reliability in extreme conditions.
Frost Fighter Indirect Heaters
A Canadian leader, Frost Fighter is renowned for building some of the most robust and reliable industrial indirect-fired heaters on the market. Engineered in Winnipeg, these units are designed to perform in extreme cold, making them a favorite for mining, oil and gas, and rental fleets.
- Extreme Cold Performance: Built to operate reliably in temperatures of -40°C and below.
- Top Models: Explore powerful options like the ultra-quiet Frost Fighter IDH500QR (500,000 BTU) and the versatile Frost Fighter IDF500 (420,000 BTU) for dependable worksite heat.
Heatstar Indirect Heaters
Heatstar is a go-to brand for construction professionals seeking dependable, portable heating. Their Pro-Series offers a range of sizes and fuel types perfect for everything from event tents to large commercial jobsites.
- Versatile Applications: Known for their mobility and ease of use in various settings.
- Top Models: The Heatstar HSP500ID-A (500,000 BTU) is a powerhouse for large venues, while the dual-fuel Heatstar HSP400ID-G (400,000 BTU) offers flexibility for indirect gas-fired heaters.
Flagro Indirect Heaters
Manufactured in Ontario, Flagro heaters are engineered for the demanding Canadian climate. They are praised for their fuel efficiency, quiet operation, and incredibly durable build, making them a staple in the rental and industrial supply markets.
- Fuel Efficiency: Many models come standard with recirculation hoods to reduce fuel costs.
- Top Models: For large-scale projects, the Flagro FVNP-750 (750,000 BTU) is an unmatched solution. The popular Flagro FVO-400RC with Recirculating Hood is a top choice for efficient indirect oil-fired heaters.
Applications: Who Uses Indirect-Fired Heaters?
Indirect-fired heaters are essential across a wide range of industries in Canada, especially where worker safety and air purity are non-negotiable.
- Construction Contractors: For concrete curing, drywalling, painting, and keeping crews warm without introducing moisture or harmful fumes.
- Event Organizers: Heating tents, temporary structures, and pavilions safely for weddings, corporate events, and festivals.
- Mining and Oil & Gas: Providing reliable heat in remote locations and hazardous environments, ensuring continuous operation.
- Industrial & Manufacturing Facilities: For plant shutdowns, maintenance turnarounds, and supplementary heating in warehouses.
- Agriculture: Keeping livestock warm, drying crops, and protecting equipment in barns and sheds.
- Home & Garage Workshops: Ideal for creating a safe and comfortable workspace, our smaller models, like garage indirect-fired heaters, are perfect for hobbyists and mechanics.
How to Choose the Right Size Indirect Fired Heater
Sizing your heater correctly ensures efficiency and prevents unnecessary fuel costs. Use this quick guide to estimate the BTU/hr you need.
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Calculate the Volume of Your Space:
Area (sq ft) × Ceiling Height (ft) = Volume (cubic ft)
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Determine the Required Temperature Rise (ΔT):
Desired Indoor Temp (°F) – Coldest Outdoor Temp (°F) = ΔT
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Estimate Your BTU Requirement:
BTU/hr ≈ Volume (ft³) × ΔT × Insulation Factor -
Insulation Factor:
0.13 (Well-insulated): Modern construction, few windows.
0.18 (Average insulation): Standard workshop or garage.
0.25 (Poorly insulated/Leaky): Barns, tents, or structures with many drafts.
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Estimate Your BTU Requirement:
Example:
For a 2,500 sq ft workshop with 16 ft ceilings (40,000 ft³) and average insulation, needing a 50°F temperature rise:
40,000 ft³ × 50°F × 0.18 = 360,000 BTU/hr
In this case, a heater like the Flagro FVNP-400RC (390,000 BTU) would be an excellent choice.
👉 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
Find Your Indirect Fired Heater at Cleanflow Today
Keep your worksites and facilities warm, safe, and productive with Cleanflow's premium selection of indirect-fired heaters. Browse our collection to find the perfect solution for your needs, or contact our expert team for personalized recommendations.
Frequently Asked Questions
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Can indirect-fired heaters be used indoors safely?
Yes. Because they vent all combustion byproducts outside, they are the safest option for indoor and enclosed spaces. They provide clean, breathable air, protecting both people and sensitive materials.
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What types of fuel do your heaters use?
Indirect-fired heaters are available in multiple fuel options to suit different job sites. The main types of fuel for indirect-fired heaters include diesel, kerosene, propane, and natural gas. Many of our units, like the Heatstar HSP200ID, are multi-fuel capable, providing flexibility on any job site.
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How portable are these industrial heaters?
Most of our indirect-fired heaters are designed for mobility. They come equipped with features like durable wheels, integrated forklift pockets, and lifting bails to make transport and placement simple.
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How far can the heat be ducted?
Ducting capability varies by model. Heaters like the Heatstar HSP100ID can be ducted up to 25 ft, while high-powered units like the Flagro FVNP-750 can push heat through 200 ft of ducting.
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Are your indirect-fired heaters for sale certified for use in Canada?
Absolutely. We prioritize safety and compliance. All our heaters from Heatstar, Flagro, and Frost Fighter are CSA, UL, and/or ETL certified, meeting stringent Canadian standards.
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How to heat a garage in winter in Canada?
Heating a Canadian garage in winter requires a powerful, reliable solution. Indirect-fired heaters are a safe choice because they deliver clean, fume-free air. Depending on your garage size, a 35,000–125,000 BTU heater will keep the space comfortable without adding moisture or harmful exhaust.
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How efficient is an indirect gas-fired heater?
Indirect gas-fired heaters typically achieve 80–90% efficiency, with high-end models reaching above 90%. While slightly less efficient than direct-fired units, they provide the major advantage of 100% clean, dry, breathable heat—ideal for enclosed or occupied spaces.