Product Description
Frost Fighter IDH400QR Indirect Fired Heater – 400,000 BTU
When extreme cold threatens your operations, the Frost Fighter 400,000 BTU indirect-fired heater delivers the clean, powerful, and reliable heat you need to stay on schedule. Available from Cleanflow, your trusted Canadian supplier, this Frost Fighter IDH400QR is engineered for Canada’s toughest conditions. Combining dual-fuel flexibility with whisper-quiet operation, it is the trusted choice for construction projects, warehouses, industrial sites, event tents, and emergency shelters.
Unmatched Performance of the Frost Fighter 400,000 BTU/h Indirect Fired Heater
Massive 400,000 BTU/h Heating Capacity
The Frost Fighter IDH400QR produces up to 2,800 CFM airflow, heating large job sites efficiently. Its multi-pass stainless steel heat exchanger ensures over 81% thermal efficiency, cutting operating costs while maximizing output.
Dual-Fuel Flexibility for Any Job Site
Oil/Diesel Model – 42-gallon tank standard (60- and 118-gallon options) for up to 22 hours of runtime.
Propane/Natural Gas Model
Superior and Flexible Ducting
Supply Ducting – Supports up to 100 ft through dual 12″ outlets or a single 16″.
Return Ducting – 16″ intake supports up to 50 ft for recirculation and fuel savings.
High Static Pressure – Maintains steady airflow through long duct runs.
Professional-Grade Design for Canadian Conditions
Ultra-Quiet Operation
At less than 62 dB, the Frost Fighter 400,000 BTU heater is ideal for noise-sensitive sites such as event tents and occupied buildings.
Clean, Safe, Breathable Heat
Its indirect-fired design separates exhaust gases from heated air, delivering 100% clean, dry, fume-free heat safe for enclosed environments.
Rugged, Portable Build
Heavy-duty pneumatic tires and ergonomic handles.
Lifting bail for secure hoisting.
Powder-coated finish and insulated jacket improve durability and efficiency.
Specifications
Feature
Oil/Diesel Model
Propane/Natural Gas Model
Heating Capacity
400,000 BTU/hr
400,000 BTU/hr
Fuel Type
Diesel / No.1 / No.2 Fuel Oil
LP or NG
Heated Air Volume
3,000 CFM
3,000 CFM
Max Static Pressure
5.0″ W.C.
5.0″ W.C.
Discharge Temperature
Up to 250 °F (121 °C)
Up to 225 °F (107 °C)
Fuel Tank Capacity
30 US gal (113.6 L)
N/A
Approx. Runtime
17–24 hours (full tank)
N/A
Supply Gas Pressure
N/A
14″ WC (LP), 7″ WC (NG)
Manifold Pressure
N/A
3.5″ WC (NG), 1.8″ WC (LP)
Electrical Power
120 V / 15 A / 60 Hz
120 V / 15 A / 60 Hz
Noise Level
74 dB(A) @ 15 ft
74 dB(A) @ 15 ft
Dimensions (L×W×H)
72″ × 30″ × 45″
72″ × 30″ × 45″
Weight (Dry)
520 lb
510 lb
Return Duct Compatible
✔️ Yes
✔️ Yes
Included Accessories
Item
Status
Notes
Main Heater Unit
✅ Included
IDH400QR Series
Fuel Tank
✅ Included (Oil/Diesel only)
30 US gallons
Pneumatic Wheels & Handles
✅ Included
For portability
Power Cord
✅ Included
120 V / 15 A / 60 Hz
❌ Not Included – Sold Separately
Accessory
Status
Notes
Supply Duct (up to 100 ft)
❌ Not Included
12″ diameter required
Return Duct (up to 50 ft)
❌ Not Included
16″ diameter required – Only for IDHQR series
Remote Thermostat
❌ Not Included
12″ diameter required – Only for IDHQR series
Ideal Applications
Construction & Infrastructure – Concrete curing, frost protection, and ground thawing.
Industrial & Commercial – Warehouses, manufacturing facilities, equipment bays.
Events & Emergency Response – Quiet, safe heat for event tents and shelters.
Agriculture – Barn heating, crop drying, livestock housing.
Browse all indirect heaters and the full Frost Fighter collection at Cleanflow.
Sizing Guide – Is the Frost Fighter 400,000 BTU Right for You?
Well-Insulated Spaces: 25–30 BTU per sq ft
Average Job Sites: 40–60 BTU per sq ft
Drafty/Exposed Areas: 60–80 BTU per sq ft
Example: A 5,000 sq ft warehouse × 50 BTU = 250,000 BTU required → the Frost Fighter 400,000 BTU IDH400QR easily covers this with reserve power for extreme cold.
👉 Use our free BTU calculator to find your ideal heater size: Cleanflow BTU Calculator
Safety and Compliance
CSA Certified for Canadian standards
Cool-to-touch jacket prevents burns
High-limit switches guard against overheating
Three-trial ignition for reliable startups
Why Choose the Frost Fighter 400,000 BTU from Cleanflow?
✓ Proven Canadian winter performance
✓ Dual-fuel flexibility
✓ Whisper-quiet
Get Your Frost Fighter IDH400QR Now
The Frost Fighter IDH400QR delivers unmatched performance, safety, and efficiency. Available now from Cleanflow, Canada’s trusted source for Frost Fighter indirect-fired heaters.
✔ Free shipping across Canada on orders over $199
✔ Expert sizing and support from Cleanflow specialists
Shop Frost Fighter Heaters | View All Heaters | Contact Cleanflow Experts
Available for immediate shipping across North America. CSA-certified for safety and performance. Choose the Frost Fighter IDH400QR for powerful, clean, reliable heat when winter strikes.
FAQs
What is an indirect-fired heater?
An indirect-fired heater uses a sealed combustion chamber and heat exchanger to deliver clean, fume-free heat while venting exhaust outside.
How do indirect-fired heaters work?
The Frost Fighter IDH400QR burns fuel in a sealed chamber, transfers heat through a stainless steel exchanger, and circulates only clean, heated air.
What size heater do I need?
Multiply square footage by 40–60 BTU per sq ft. The Frost Fighter 400,000 BTU unit covers medium-to-large job sites efficiently.
Where can indirect-fired heaters be used?
Ideal for construction sites, warehouses, agriculture, events, and emergency shelters across Canada.
