Product Description
Flagro F-400T 400,000 BTU Heater for Industrial Construction and Jobsite Heating
When job site temperatures drop and productivity is on the line, the Flagro F-400T Dual Fuel Construction Heater delivers. With 400,000 BTU of powerful heat, dual-fuel flexibility, and CSA-certified safety systems, this Flagro 400,000 BTU heater is the rugged solution professionals depend on across North America.
Designed and built by Flagro Industries, a leader in portable construction heat, the Flagro F-400T Industrial Construction Jobsite Heater combines reliability, safety, and fuel efficiency, keeping your crew productive even in the harshest winter conditions.
Key Features of the Flagro F-400T 400,000 BTUH Heater
Dual-Fuel Flexibility
Easily switch between propane and natural gas using the built-in selector valve. No tools or conversion kits needed. This Flagro direct-fired heater adapts instantly to available fuel sources, keeping your project running without interruption.
400,000 BTU of Powerful Heat
Delivering consistent, high-capacity performance, the Flagro F-400T produces enough heat to quickly warm large areas, including construction zones, infrastructure projects, and industrial facilities. With an air output of up to 7,000 CFM, it distributes warmth evenly and efficiently.
Electronic Direct Spark Ignition
Start-up is instant even in freezing weather. The electronic direct spark ignition system eliminates the need for pilot lights and ensures reliable ignition every time.
100% Flame Safeguard System
Built with safety-first engineering, the F-400T automatically shuts off the gas supply if no flame is detected, protecting both workers and equipment.
Thermostat-Controlled Operation
The included thermostat (with 20-ft cord) provides precise temperature regulation, allowing you to maintain comfort while maximizing fuel efficiency. Set it once. This heater handles the rest.
Clean, Efficient Combustion
Designed for minimal products of combustion, the Flagro F-400T Dual Fuel Construction Heater offers cleaner operation and longer equipment life. It’s an environmentally conscious choice for contractors.
Rugged Steel Frame
Job sites demand durability, and the Flagro F-400T delivers with a heavy-duty, powder-coated steel frame. Its stackable, portable design ensures easy transport, setup, and storage between projects.
CSA Certified for Jobsite Safety
This Flagro construction heater meets strict North American standards—ANSI Z83.7 / CSA 2.14 for unvented gas-fired heaters—ensuring dependable, code-compliant performance in the field.
Specifications
Feature
Details
Model
Flagro F-400T
BTU Output
400,000 BTU/hr
Fuel Type
Propane or Natural Gas
Propane Consumption
18.5 lbs/hr
Natural Gas Consumption
380 CFH
Manifold Pressure (Propane)
1.25” W.C.
Manifold Pressure (Natural Gas)
3.25” W.C.
Fan Motor
1 HP
Air Circulation
2,000–7,000 CFM
Air Outlet Diameter
15”
Ignition Type
Electronic Direct Spark
Power Requirements
115V / 60Hz
Thermostat
Included (with 20-ft cord)
Weight
Approx. 120 lbs
Included & Optional Accessories
Included: Thermostat with cord, built-in fuel selector valve
Optional:
Vented Regulator – B42R1.25
Ventless Regulator – 240SDOPCO
LP/NG Hose Assembly – S54180-20 (15 FT, 1¼” ID MP x MP)
These accessories ensure proper fuel control and flexible installation across temporary or mobile job sites.
Built for Harsh Conditions and Demanding Work
Whether you’re curing concrete, thawing ground, heating temporary shelters, or supporting large industrial operations, the Flagro F-400T Industrial Construction Jobsite Heater is purpose-built for demanding conditions.
It performs flawlessly where others fail, delivering reliable, direct-fired heat in freezing temperatures and high-traffic environments. When uptime matters, Flagro delivers.
Applications
Construction & maintenance sites
Oilfield & pipeline operations
Disaster response & emergency heat
Municipal & public works facilities
Warehouses, shops, and storage areas
TEMP-AIR® replacement or integration
Safety & Operation Guidelines
Operate only in well-ventilated or semi-open areas.
Maintain minimum clearances: 10 ft (front), 2 ft (rear/sides), 3 ft (above).
Not intended for residential or enclosed indoor use.
Place on a stable, level surface during operation and use only with a 115V / 60Hz power source.
Regularly inspect hoses, valves, and the ignition system.
Every Flagro Industries heater is designed with safety, performance, and compliance at its core, ensuring reliable operation across job sites and seasons.
Flagro F-400T vs. Other Construction Heaters
Feature
Flagro F-400T
Typical 400,000 BTU Heater
Dual-Fuel Ready
✅ Built-In Selector
❌ Conversion Kit Required
Flame Safeguard
✅ 100% Automatic Shutoff
⚠️ Manual Reset
Ignition
✅ Direct Spark
⚠️ Pilot Light
Frame Design
✅ Stackable, Portable
⚠️ Fixed or Heavy
CSA Certification
✅ ANSI Z83.7 / CSA 2.14
⚠️ Not Always Certified
The Flagro 400,000 BTU heater outperforms competitors like TEMP-AIR® with superior portability, fuel flexibility, and low-maintenance design, boosting jobsite productivity.
Get the Flagro F-400T 400,000 BTU Construction Heater Today
When it comes to rugged performance and reliable heat output, the Flagro F-400T Dual Fuel Construction Heater sets the standard.
Designed for industrial professionals, this 400,000 BTU propane heater provides the power, efficiency, and safety your team needs to stay productive in even the coldest environments.
Order now from Cleanflow and experience:
✅ Fast nationwide shipping across Canada and the U.S.
✅ Expert technical support from heating specialists
✅ Competitive pricing and volume discounts
✅ Authentic Flagro parts and accessories
Keep your crew warm, your workflow uninterrupted, and your site compliant with the trusted performance of the Flagro F-400T.
FAQs
Can the Flagro F-400T be used in enclosed indoor spaces?
No. The Flagro F-400T is a direct-fired heater designed for well-ventilated or outdoor job sites. Since it releases combustion byproducts into the air, it should not be used in enclosed indoor environments without proper airflow and ventilation systems.
How do I switch between propane and natural gas on the F-400T?
Switching between fuels is simple using the built-in dual fuel selector. No conversion kits or additional tools are needed. Just adjust the selector valve and ensure you're using the correct pressure regulator for either propane (1.25" W.C.) or natural gas (3.25" W.C.).
What kind of power source is required to run the Flagro 400,000 BTU heater?
The Flagro F-400T requires a standard 115V / 20-AMP power supply for the fan motor and electronic direct spark ignition. This is commonly available on most commercial and industrial job sites.
How much fuel does the Flagro F-400T consume during operation?
At full output (400,000 BTU/hr), it consumes approximately:
18.5 lbs/hr of propane
380 CFH of natural gas
Ensure your job site is equipped with an adequate fuel source, especially for extended operations or colder climates.
How do I know if 400,000 BTU is enough heat for my job site?
Heating requirements depend on the size of your space, insulation, outside temperature, and ventilation. Use our BTU Calculator to estimate the correct heat output for your job site and determine whether a Flagro F-400T 400,000 BTU heater is sufficient or if you’ll need multiple units.
