Flagro Heaters: Canadian-Built Heating That Keep Your Operations Moving
Flagro heaters have been built in St. Catharines, Ontario since 1978, when the F-150, the first Flagro construction heater, went onto Canadian sites. The F-150 is still here, and Cleanflow stocks every Flagro heater, from 50,000 to 1,500,000 BTU/h. Three types; the type matters more than the BTU figure.
Direct-fired. The F-150 and F-375 burn vapour propane with no fan or electricity. The F-400T, F-1000T and F-1500T burn propane or natural gas with a thermostat and a 2,000 to 7,000 CFM fan. All combustion products enter the heated air, so use them in ventilated shells, open structures, and for pre-pour ground thawing. The THC-175DF and THC-355CDF tent heaters are ductable and thermostat-controlled.
Indirect-fired. A Riello burner fires a welded 304 stainless steel heat exchanger, and only clean, dry air is ducted into the space. FVO models burn oil from a built-in 23 or 42 US gallon tank; FVNP models run on propane or natural gas from an external supply. The 200 series gives 185,000 to 200,000 BTU/h, the 400 series 390,000, and the 750 series 750,000 at 7,000 CFM. RC models add a return-air inlet and duct to 150 ft; the standard FVO-400 and FVNP-400 duct to 50 ft. Specify indirect-fired for occupied hoarding, concrete and finishing work, and event tents.
Radiant. The FRHR-100, 90,000 BTU/h on propane or natural gas, warms crews and surfaces at open-air stations without moving air.
Every model is cETLus or cUL listed. For other brands by type, see the industrial heaters collection.
A Canadian Manufacturer with Proven History
Founded by Bruce Watson and acquired by Sunbelt Rentals in 2022, Flagro has expanded its manufacturing footprint and product range while holding the line on quality. Every heater is tested by qualified technicians and meets applicable regulatory and safety standards. Decades of field use in harsh Canadian conditions have shaped what Flagro builds: durable, serviceable machines that start reliably and run clean.
What Flagro Offers Canada’s Worksites and Facilities
- Fuel options: propane (LP), natural gas (NG), and oil/diesel
- Broad BTU range: from 50,000 to 1,500,000 BTU/h to match any space or spec
- Direct-fired, indirect-fired, and radiant models
- North American manufacturing and fast parts turnaround for minimal downtime
Flagro Products
Heaters
Top Picks for Construction & Industrial Sites
Flagro F-1500T Dual-Fuel Direct-Fired Heater, 1,500,000 BTU/h
Delivering up to 1,500,000 BTU with propane or natural gas, this unit is one of the most powerful Flagro construction heaters for sale in Canada. Built for large-scale builds and winter maintenance, it keeps projects moving even in sub-zero conditions.
Flagro F-1000T Dual-Fuel Direct-Fired Heater, 1,000,000 BTU/h
This 1,000,000 BTU model offers propane/natural gas flexibility with dependable ignition and safety systems. It’s ideal for contractors who need rugged, high-capacity heating on Canadian job sites.
Flagro F-400T Dual-Fuel Direct-Fired Heater, 400,000 BTU/h
At 400,000 BTU, this dual-fuel propane/natural gas unit provides reliable, portable heating for mid-size projects. Canadian crews value it for its simple controls, rugged design, and efficient air circulation.
Best for Events, Agriculture & Facilities
Flagro FVNP-750 Propane/Natural Gas Indirect-Fired Heater, 750,000 BTU/h
Offering 750,000 BTU of clean, dry heat with propane or natural gas, this unit is perfect for event tents, enclosed venues, or greenhouse operations. Its fume-free performance ensures safe comfort across Canada.
Flagro FVO-750 Oil Indirect-Fired Heater, 750,000 BTU/h
This 750,000 BTU oil-fired model delivers powerful heat through a clean exchanger system. Canadian agricultural and industrial facilities rely on it for dependable, ductable warmth in large enclosed areas.
Flagro FVNP-200RC Propane/Natural Gas Indirect-Fired Heater, 200,000 BTU/h
Producing 200,000 BTU, this propane/natural gas heater is quiet, efficient, and easy to transport. It’s a go-to for event planners, farmers, and facility operators who need versatile Canadian-built heating.
Flagro FVO-200RC Oil Indirect-Fired Heater, 185,000 BTU/h
With 185,000 BTU and a built-in fuel tank, this indirect-fired unit offers extended run times. It’s best for agricultural setups, maintenance shops, and event spaces needing safe, portable heat in Canada.
Built for the Industries That Keep Canada Running
- Construction and Industrial: Heat concrete pours, protect finishes, and keep crews on task in sub-zero conditions with indirect or direct-fired units sized for large volumes.
- Events: Deliver clean, fume-free heat to enclosed tents and venues with indirect-fired heaters.
- Agriculture: Maintain stable temperatures for greenhouses and livestock; choose dual-fuel options for flexibility and radiant models for open or semi-enclosed areas.
- Commercial Facilities: Heat shutdowns, maintenance bays, and emergency response without permanent installs.
Why Teams Choose Flagro
- Quality since 1978: Proven designs that withstand harsh use and rough transport
- Strong technical support: Real help when you need it, from setup to service
- Fair warranty program: Backing that reflects confidence in the build
- Fast parts supply: Quick, consistent turnaround that cuts downtime
- Value over life-cycle: Competitively priced equipment that delivers ROI year after year
Keep Your Fleet Running: Parts and Service
Construction heaters take a beating. Flagro’s serviceable designs and readily available parts keep them earning. Routine checks on blower motors, gas valves, thermocouples, and fuel lines prevent costly downtime. Replacing a tired component is often a fast, low-cost fix that extends the life of your heater and protects your schedule and budget.
- Canadian-built; tested to safety and regulatory standards
- 50,000–1,500,000 BTU/h outputs across fuel types
- Direct, indirect, radiant, and dual-fuel options
- Strong technical support, fair warranty, fast parts turnaround
- Ideal for construction sites, events, agriculture, and commercial facilities
Sizing Your Heater
Choosing the right heater size ensures efficient performance and lower fuel costs. A simple rule of thumb is:
- Well-insulated indoor spaces: 25–30 BTU per sq. ft.
- Typical job sites: 40–60 BTU per sq. ft.
- Drafty/exposed areas: 60–80 BTU per sq. ft.
Example: A 2,000 sq. ft. construction site at 50 BTU per sq. ft. needs 100,000 BTU/h. For larger, exposed sites, a higher-capacity Flagro construction heater like the F-1500T may be the best fit.
Tip: Always consider insulation quality, ceiling height, and outside temperature when sizing.
👉 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.
Buy Flagro Heaters Online from Cleanflow
Shop Flagro heaters for sale at Cleanflow, Canada's professional source for portable heating equipment, workwear, and industrial supplies. Whether you need a direct-fired construction heater, an indirect-fired unit for enclosed spaces, or a radiant or oil heater for cold-weather work, order today and we'll ship across Canada and the USA from our Winnipeg warehouse. Orders over $199 ship free, and every heater is covered by a 30-day return or exchange window.
Frequently Asked Questions
Are Flagro heaters compliant for use in Canada?
Yes. Flagro products are manufactured in North America and tested by qualified technicians to meet applicable regulatory and safety standards. Models and fuel types are available to suit provincial requirements.
Are Flagro direct-fired heaters salamander heaters?
Yes. "Salamander heater" is an informal industry term for a portable forced-air construction heater, typically propane, natural gas, or kerosene-fueled, used on construction sites and ventilated workspaces. Flagro's direct-fired propane and natural gas heaters (the F-150, F-375, F-400T, F-1000T, and F-1500T) fit this category. They deliver high-output heat in well-ventilated areas, exactly what's typically meant by a salamander heater.
Which heater type should I choose for enclosed spaces?
Use indirect-fired heaters for enclosed or occupied areas. They separate combustion by-products from the heated air, delivering clean, dry heat suitable for finishing work and events.
Do Flagro heaters support different fuels on the same unit?
Yes. Several Flagro construction heaters offer dual-fuel capability (NG/LP), giving you flexibility when site fuel availability changes and helping reduce downtime.
How quickly can I get parts and service?
Flagro’s parts program is known for quick, consistent turnaround. Routine service items—blower motors, valves, thermocouples, and hoses—are commonly stocked to keep your fleet running.
Can I control temperature remotely?
Yes. Each heater takes one thermostat. The THC and T models ship with one; the FV indirect-fired models take the FV-THB remote thermostat.
Do Flagro propane heaters work in extreme cold?
Yes. Flagro propane heaters are built in Canada and tested in harsh winter conditions. They deliver reliable heat output and are trusted on job sites nationwide.
Are diesel-fired Flagro heaters safe for indoor use?
Flagro diesel heaters should only be used in ventilated spaces or with indirect-fired models. For enclosed environments, choose Flagro indirect-fired heaters for clean, safe air.
What makes Flagro construction heaters different?
Flagro construction heaters are designed for Canadian job sites, offering high BTU output, fuel flexibility, and durable builds that reduce downtime and keep crews productive.
Are Flagro oil heaters the same as diesel heaters?
Yes. Flagro's oil-fired indirect heaters (FVO-200RC, FVO-400, FVO-400RC, FVO-750) run on heating oil or diesel fuel. The industry uses these terms interchangeably in construction and industrial heating. These models pair Riello burner technology with built-in fuel tanks (23 to 42 US gallons, depending on model) for extended run times on job sites without continuous refueling.