Frost Fighter Indirect-Fired Heaters

Frost Fighter Heaters: Canada’s Cold-Weather Solution

Frost Fighter heaters are indirect-fired portable heaters built in Winnipeg since 1965. The burner fires inside a sealed heat exchanger, a blower pushes only clean, dry air into the space, and combustion gases vent outside. These are the heaters for concrete curing, occupied hoarding, and event tents, where a direct-fired unit adds moisture and exhaust to the air.

This collection carries Frost Fighter models from 170,000 to 700,000 BTU/h. Every model comes in an oil/diesel or an LP/NG version; LP/NG models switch between propane and natural gas, and the IHS series can be ordered with a burner switch-out for either fuel. Every model is CSA or ETL certified and ships from Cleanflow's Winnipeg warehouse, minutes from the Frost Fighter Winnipeg plant.

How to Choose a Frost Fighter Heater

1. Size the heat. Plan 40 to 60 BTU per square foot for a hoarded jobsite, 25 to 30 for an insulated building, 60 to 80 for a drafty shell.
2. Match the model to the space.
   • Single floor or small tent, up to 4,250 sq ft: IDH200QR (170,000 BTU/h).
   • Pour, warehouse bay or mid-size tent, 6,500 to 12,500 sq ft: IDH400QR, IDF500 or IDH500QR (400,000 to 500,000 BTU/h).
   • Large enclosure, multi-storey hoarding or remote industrial site, up to 17,500 sq ft: IHS700H or IHS700P (700,000 BTU/h).
3. Pick the blower for the duct run. The IHS700H (8,000 CFM) handles runs over 50 ft. The IHS700P (4,600 CFM) suits long unattended runtime.

For direct-fired and radiant spot heat, see the industrial heaters collection.

Where Frost Fighter Heaters Are Used

• General construction and winter job sites
• Concrete curing, masonry, bridge, and road building
• Restoration and relief; warehouse and facility heating
• Equipment and aircraft pre-heating
• Mining, oil, and pipeline industries
• Drying paint and coatings; agricultural moisture control; livestock temperature control
• Tent and event heating; pest control

View all indirect-fired heaters

Why Choose Frost Fighter Heaters for Construction and Industrial Sites

Frost Fighter heaters stand out for durability, fuel flexibility, and safety, purpose-built for Canadian winters.

• Clean, dry heat: Indirect combustion and stainless steel heat exchangers deliver fume-free air for enclosed spaces.
• Fuel choice: Every model comes in an oil/diesel or an LP/NG version, and LP/NG units switch between propane and natural gas.
• Long duct runs: High static pressure blowers support extended supply and return ducting for even heat distribution.
• Quiet operation: The IDH400QR runs under 62 dB and the IDH500QR at 68 dB, suited to event and tent heating.
• Certified safe: CSA/ETL-certified models align with Canadian safety and compliance requirements.
• Built to move: Mobile jobsite frames with heavy-duty pneumatic tires and lifting bails for fast deployment.
• Efficiency that pays: Up to 81% efficiency and recirculation options help cut fuel costs and maintain consistent temperatures.

Looking for a Frost Fighter for sale? Shop our in-stock models and accessories with Canada-wide shipping.

Why Indirect-Fired? The Safety and Quality Difference

Direct-fired heaters dump combustion products, carbon monoxide, carbon dioxide, water vapor, and unburnt fuel directly into the heated airstream. They're cheaper to manufacture and acceptable for high-ventilation outdoor or open-shell applications, but they're not suitable for occupied indoor spaces, concrete curing, or finishing work where moisture and exhaust contamination cause real damage.

Indirect-fired heaters separate combustion from the airstream. Fuel burns inside a sealed combustion chamber, heat transfers through a stainless steel heat exchanger, and a blower pushes only the warmed, clean air into the space. Combustion gases vent outside through a flue.

The result: fume-free, dry, breathable air rated for enclosed work areas, occupied spaces, concrete curing (where moisture would compromise the cure), paint and coating drying (where exhaust would contaminate the finish), and worker comfort in tents and shelters..

The IDH and IDF series include stainless steel multi-pass heat exchangers and fully insulated jackets to maintain efficiency in sub-zero conditions.

Which Frost Fighter for the Job

Concrete curing, masonry, and finishing

Plan for 50 to 75 BTU per square foot of slab or enclosure. The IDF350 covers 4,650 to 7,000 sq ft at that rate; for larger pours or longer winter cures, step up to the IDH400QR or IDH500QR. The insulated jacket keeps output steady through an extended cure cycle.

General construction and winter jobsites

Plan 40 to 60 BTU per square foot. The IDH200QR covers framing, finishing or partition zones to 4,250 sq ft. The IDF500, with 6-ply pneumatic tires and a lifting bail, is the unit for sites that move the heater between zones; 45 ft of 16" ducting reaches a second work area from one position.

Restoration drying and warehouse heating

Restoration needs dry heat with no exhaust in it, so indirect-fired is the only option. For 5,000 to 10,000 sq ft, the IDH400QR, rated over 81% efficient and under 62 dB, with 100 ft of supply and 50 ft of return ducting, sits outside the affected space while the air goes to the drying zone.

Mining, oil and pipeline sites

Remote sites with bulk diesel and multi-shift runtime call for the IHS series. The IHS700P pairs 700,000 BTU/h and 4,600 CFM with the burner switch-out, specified at order, for oil or gas, and optional 460 V, 575 V and 600 V three-phase power; the optional 175-gallon oil tank gives up to 35 hours of unattended runtime. Where duct runs are long or restricted, the IHS700H moves up to 8,000 CFM at 6.0" w.c. on the same output.

Tent and event heating

Air quality and noise matter in an occupied tent. The IDH400QR is the quietest model in the range at under 62 dB; the IDH500QR runs at 68 dB. Both deliver fume-free heat through long duct runs, so the heater stays outside the tent. Plan 25 to 30 BTU per square foot for a well-sealed tent, more for an open venue.

Explore Frost Fighter Indirect-Fired Heater Models

Find the Frost Fighter indirect-fired heater for your application, construction heat, restoration, event tents, or industrial projects. These Frost Fighter heaters for construction are engineered for harsh environments.

Frost Fighter IDH200QR — 170,000 BTU/h, Multi-Fuel Efficiency

The Frost Fighter IDH200QR indirect-fired heater delivers 170,000 BTU/h and 1610 CFM with quiet operation (<74 dB). Available in Propane/Natural Gas (LP/NG) and Oil/Diesel, this model features the high-efficiency “Multi-Pass” stainless steel heat exchanger (81% efficiency), extended ducting capability (12" outlet up to 100 ft; 12" return up to 50 ft), independent fan and combustion air for no cold starts, and CSA approvals. Ideal for small to mid-size construction zones, restoration, and tent/event spaces needing clean, dry heat.

• Frost Fighter indirect-fired heater for sale in Canada
• Use cases: jobsite heaters, warehouse heating, enclosed work areas
• Fuel options: LP/NG or Oil/Diesel for maximum versatility

Frost Fighter IDH400QR — 400,000 BTU/h, Long Duct Runs

Built for extreme conditions, the Frost Fighter IDH400QR indirect fired heater (Oil/Diesel or LP/NG) delivers up to 400,000 BTU/h and <62 dB quiet operation. A fully insulated jacket retains heat and remains cool to the touch; the stainless steel heat exchanger and independent fan/combustion air provide consistent output in freezing temperatures. Supports up to 100 ft of supply ducting (dual 12" outlets) and up to 50 ft of 16" return ducting for efficient, even coverage.

• Perfect for large construction sites, concrete curing, and industrial spaces
• Long ducting capability for sectionalized heat control
• CSA-compliant for safety-driven projects

Frost Fighter IDH500QR — 500,000 BTU/h, High Airflow

For large-scale heating, the Frost Fighter IDH500QR indirect-fired heater delivers 500,000 BTU/h with 4800 CFM airflow and ultra-quiet operation (<62 dB). Features a stainless steel multi-pass heat exchanger, insulated jacket, high static pressure performance, dual 12" duct outlets, and a 42-gallon fuel tank for up to 14 hours of runtime. Meets CSA approvals.

• Ideal for mining operations, oil/pipeline projects, aircraft, and equipment pre-heating
• Long runtime reduces refueling downtime
• Reliable heat distribution across big spaces

Frost Fighter IDF350 and IDF500 — Portable, Dual-Fuel Performance

Frost Fighter IDF350 indirect-fired portable heater: 350,000 BTU/h of clean, dry heat; stainless steel heat exchanger; fully insulated jacket; ductable up to 50 ft. Great for construction, event tents, and large facilities.

Frost Fighter IDF500 indirect-fired portable heater: 420,000 BTU/h; dual-fuel options (Oil/Diesel/Kerosene or LP/NG); GenySis diagnostics (oil models); heavy-duty tires; CSA/ETL certified; ductable up to 50 ft. Designed for industrial-grade reliability.

These Frost Fighter portable indirect-fired heaters are built for mobility and performance on demanding Canadian job sites.

Frost Fighter IHS700H — 700,000 BTU/h, High Static Pressure

The Frost Fighter IHS700H is the highest-airflow heater in the Frost Fighter lineup. It has 700,000 BTU/h, 8,000 CFM, and approximately 6.0 inches of static pressure. The high-static-pressure design supports the longest duct runs in the catalog and overcomes restrictive duct configurations on complex job sites. Multi-fuel capable (Oil/Diesel, LP/NG) with stainless steel heat exchanger and CSA/ETL certification. Best for mining, large industrial enclosures, and pipeline projects where duct geometry or distance would limit smaller models.

Frost Fighter IHS700P — 700,000 BTU/h, Long Runtime

The Frost Fighter IHS700P pairs 700,000 BTU/h and 4,600 CFM with the longest unattended runtime in the lineup, up to 35 hours on the optional 175-gallon Oil/Diesel tank. Multi-fuel capable across Oil, Diesel, LP, and NG with the EZ Burner Switch-Out Kit, allowing pre-configured field conversion between fuel types. Supports 208/230V single-phase and three-phase power, with optional 460V, 575V, and 600V configurations to match jobsite electrical service. Over 80% thermal efficiency, CSA and ETL-certified. Best for pipeline, oilfield, large-scale industrial, and emergency response applications where refueling downtime must be minimized.

Frost Fighter Heater Comparison Chart

Every Frost Fighter heater Cleanflow stocks, side by side, with Frost Fighter's published figures. Coverage is Cleanflow's estimate at 40 to 60 BTU per square foot; insulated spaces cover more, drafty ones less.

*Coverage at 40–60 BTU/sq.ft. (typical jobsite). For well-insulated spaces (25–30 BTU/sq.ft.), each model covers more area; for drafty/exposed areas (60–80 BTU/sq.ft.), less. Always select a heater with 20–30% reserve power for extreme cold. Use the Cleanflow BTU Calculator to size your space precisely.

Fuel Selection: Oil/Diesel, LP/NG, or Dual-Fuel?

Oil/diesel suits sites with bulk fuel storage, diesel equipment, and unreliable propane delivery. These models give more BTU on the same chassis (the IDH500QR makes 500,000 BTU/h on oil against 420,000 on LP/NG) and carry an integrated tank, 18 to 42 gallons standard by model and up to 175 gallons optional on the IHS series, for multi-shift runtime.

LP/NG suits urban and suburban sites with gas service, occupied spaces that want the cleanest combustion, and crews that swap cylinders rather than fill tanks. The chassis is lighter with no integral tank, and the EZ ball-valve switches the burner between propane and natural gas without tools. Events, restoration, and facility heating near a gas main fit here.

Both fuels on one heater is an IHS-series option. The EZ burner switch-out, specified when the heater is ordered, lets an IHS700H or IHS700P run on oil/diesel or LP/NG. The IDH and IDF models are built for one fuel family, so choose at purchase.

Accessories – What's Included vs. Sold Separately

Check the model's manual for exact accessory compatibility.

Sizing Your Frost Fighter Heater

Choose the right BTU output for efficient, safe heat on-site:

• Well-insulated indoor spaces: 25–30 BTU/sq. ft.
• Typical job sites: 40–60 BTU/sq. ft.
• Drafty/exposed areas: 60–80 BTU/sq. ft.
• Concrete curing: 50–75 BTU/sq. ft.

Example: A 2,000 sq. ft. site × 50 BTU = 100,000 BTU

→ Use a model like the IDH200QR (170,000 BTU/h) for reserve power.

✔ Consider insulation, temperature gap, and air changes.

👉 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.

Ready to heat your job site? Shop Frost Fighter for Sale

Frost Fighter heaters are built in Winnipeg, Canada, for the toughest Canadian winters. Trusted for reliable heat, clean air, and CSA-certified safety, our indirect-fired heaters and accessories are in stock and ready for Canada-wide shipping. Whether you need industrial, construction, or event heating, shop Frost Fighter today and stay productive all winter.

Cleanflow ships across Canada and the USA, with free shipping on orders over $199 and a 30-day return or exchange window on every heater. Call 1-866-335-1078 with the square footage, the fuel on site, and the duct run, and we will confirm the model before the season starts.

Shop Frost Fighter heaters today.