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Description
Low-Noise, High-Performance Indirect Heater for Cold Weather Job Sites
The Frost Fighter IDH400QRM is made for worksites that demand performance without the noise. With 395,000 BTU/hr of indirect, oil-fired heat and whisper-quiet 65dB operation, this recirculating heater brings serious warmth with minimal disruption.
Whether you're heating enclosed structures, tented work areas, or sensitive environments like schools or hospitals, the IDH400QRM keeps things warm, safe, and efficient. It also comes recirculation-ready right out of the box, reducing fuel use and heating time.
Frost Fighter IDH400QRM Key Features & Benefits
Quiet But Powerful Heating
- Up to 395,000 BTU/hr
- 65dB sound rating – one of the quietest indirect heaters on the market
- Recirculation-ready to cut down on fuel use and warm-up times
Built for Efficient Airflow
- 2,800 CFM heated air delivery
- Choose your setup: Dual 12” or Single 16” outlet
- 16” return inlet allows recirculated heat
- Handles up to 100 ft of supply duct or 50 ft of return duct (subtract from supply run length)
Smart, Dependable Performance
- Voltage and fan control meter included
- The fan bypass switch lets you run the fan-only without the burner
- Independent combustion air fan ensures clean, consistent startups
Built to Withstand Real Job Sites
- Stainless steel multi-pass heat exchanger
- Fully insulated jacket stays cool to the touch
- Durable powder-coated finish resists rust
- 6-ply pneumatic tires and a lifting bail make it easy to move
Specifications
| Feature | Details |
| Model | IDH400QRM |
| Fuel Type | Diesel / Oil |
| BTU Output | 395,000 BTU/hr |
| Air Flow | 2,800 CFM |
| Static Pressure | 2.8" |
| Sound Level | 62–65 dB |
| Ducting | Dual 12” or Single 16” |
| Max Supply Duct | 100 ft |
| Max Return Duct | 50 ft |
| Discharge Temp | Up to 290°F |
| Power Requirement | 120V – 15A |
| Running Amps | 9.2 A |
| Fuel Tank | 42 gal (std) / 60 gal (opt) |
| Run Time | ~16.5 hr (42 gal) / 24 hr (60 gal) |
| Dimensions | 83” L x 37” W x 52” H |
| Weight | 580 lbs (crated) |
| Certification | CSA Certified |
Accessories – What's Included vs. What's Not Included
✅ INCLUDED WITH THE HEATER
| Accessory | Status | Notes |
| Main Heater Unit | ✅ Included | IDH400QRM pre-configured with Oil/Diesel fuel setup |
| Dual Fuel-Compatible Burner | ✅ Included | Factory set to Oil/Diesel (LP kit sold separately) |
| Fuel Tank | ✅ Included | 42-gallon standard (60-gallon optional upgrade available) |
| Pneumatic Wheels & Lift Bail | ✅ Included | 6-ply tires for mobility and a crane lift point for easy transport |
| Fan Bypass Switch | ✅ Included | Allows fan-only operation without the burner |
| Voltage & Fan Control Meter | ✅ Included | Displays voltage and allows fan control |
❌ NOT INCLUDED – SOLD SEPARATELY
| Accessory | Status | Notes |
| Ducting (Supply & Return) | ❌ Not Included | Dual 12" or Single 16" ducting for supply; 16" return duct optional |
| Return Air Adapter | ❌ Not Included | Needed for closed-loop heating with recirculation |
| Remote Thermostat | ❌ Not Included | Optional for remote temperature control |
| Extended Run Fuel Tank (60 gal) | ❌ Not Included | Optional upgrade for 24+ hour runtime |
Why Choose the Frost Fighter IDH400QRM?
If your job site requires serious indirect heat, but your environment requires quiet. This is the model to get. The IDH400QRM is one of the quietest and fuel-efficient heaters in its class, thanks to its recirculation function and smart control features.
It handles long duct runs with ease, keeps operation simple, and delivers 395,000 BTU/hr of heat with pinpoint control. With its fan-only option, rugged heat exchanger, and cool-touch exterior, it’s designed to work hard and last long.
Why Buy Frost Fighter from Cleanflow?
You're not just buying a heater. You’re buying dependable support. We stock only 100% genuine Frost Fighter units, no refurbs, no grey market models, and we ship fast across Canada and the USA. Our team is always here if you need help with specs, sizing, or installation.
Need help sizing your heater? Use our free BTU Calculator to find the right model based on your jobsite, insulation level, and local temperatures.
FAQs
Can I use this heater with long duct runs?
Yes, the IDH400QRM supports up to 100 ft of supply duct. If you’re using a return duct, subtract that length from the total supply.
Does it run quietly?
Yes, at 62 to 65 dB, it’s one of the quietest indirect-fired heaters available. Perfect for schools, events, and enclosed job sites.
Can I run the fan without the burner?
Yes. The fan bypass switch lets you circulate air without heating, great for ventilation or cooldown.
Does it work with return ducting?
It does. Use up to 50 ft of return duct to recirculate heated air and increase fuel efficiency.
Does it ship to the USA?
Yes. We ship across Canada and the United States.
Can I exchange the unit if needed?
Exchanges are handled case-by-case. Contact our team within the return window, and we’ll help make things right.
Still have questions? Call us or use the live chat. We’re here to help.
Manuals & Documentation
❌ Currently unavailable. Please contact us to check potential availability.
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