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Flagro Heaters: Clean, Powerful Heat for Jobsites, Tents & Industrial Spaces (2025/2026 Guide)
When the temperature drops, timelines shouldn’t. That’s why Climate Control Solutions partners with Flagro Heater Sales to deliver rugged, high-output heating built for construction sites, industrial facilities, disaster recovery, tented events, and more. Flagro’s North American engineering heritage (serving customers since 1978) shows up in every detail—from durable heat exchangers to smart, serviceable designs that thrive in rental fleets.
Why Flagro?
- Purpose-built for jobsites & rentals: Proven components and service-friendly layouts reduce downtime.
- Clean, dry heat options: Indirect-fired models exhaust combustion outdoors, delivering fume-free, moisture-free air to your space—ideal for finishing work and occupied areas.
- Fuel flexibility: Diesel/oil, propane, and natural gas options cover diverse worksites and available fuels.
Direct-Fired Construction Heaters (High BTUs, Simple Setup)
Flagro’s direct-fired line brings fast heat with straightforward controls—excellent for open, well-ventilated areas and curing/ground thaw support:
- F-150 / F-375 / F-400T / F-1000T / F-1500T – popular models with dual-fuel (NG/LP) options in select sizes for easy fuel sourcing on site.
“Best for: Framing & drywall, concrete protection, large tent pre-heat (with proper ventilation), warehouse take-the-edge-off heat.”
Indirect-Fired Heaters (Clean Air, Indoor-Friendly)
When the job demands clean, dry, fume-free air inside, choose indirect-fired:
- FVO-400 / FVNP-400 — Flagro’s workhorse ~390,000 BTU/hr class heaters. Riello burner technology delivers reliable cold-weather starts; large onboard tanks (oil models) support long run times. Recirculation models (-RC) include a backward-incline blower for higher CFM and quieter, lower-amp operation—perfect for long duct runs and larger volumes.
“Best for: Interior finishing, occupied spaces, disaster relief shelters, restoration projects, and event heating where air quality matters.”
Radiant & Tent Heaters (Quiet, Targeted Warmth)
For audience-facing spaces and sensitive work areas, Flagro’s radiant and tent heaters bring low-noise comfort:
- FRHR-100 (P or N) radiant heaters for focused heat without high airflow.
- THC-series tent heaters (e.g., THC-85P, THC-175DF, THC-355CDF) designed for event and temporary structures with ductable, dual-fuel options.
Self-Contained Heater Trailers (Turnkey Mobility)
Need heat plus mobility and power on a single platform? Flagro’s trailer packages pair twin 390k BTU heaters with integrated fuel and power—ideal for large areas, remote sites, and fast deployment.
How to Choose the Right Flagro Heater
- Space & airflow: Square footage, ceiling height, and air changes drive BTU needs.
- Indoor air quality: If occupants or finishes are sensitive, go indirect-fired.
- Fuel logistics: Pick from diesel/oil (onboard tanks), propane, or natural gas based on availability and runtime targets.
- Duct runs & noise: For long ducting or lower sound, consider RC (recirculation) variants with higher CFM blowers.
Flagro Heater Sizing Chart (Quick Reference)
Use these rule-of-thumb coverage estimates to shortlist the right Flagro heater. Final selection should account for ceiling height, infiltration/air changes, insulation, humidity/drying goals, and required ventilation.Enclosed Spaces (10′ ceilings)
| Model | Type | Max Area @ ΔT 30°F | Max Area @ ΔT 50°F | Max Area @ ΔT 70°F |
|---|---|---|---|---|
| FVNP-400 (Indirect NG/LP) | Indirect-Fired | 13,000 sq ft | 7,800 sq ft | 5,571 sq ft |
| FVO-400 (Indirect Oil/Diesel) | Indirect-Fired | 13,000 sq ft | 7,800 sq ft | 5,571 sq ft |
| F-400T (Direct NG/LP) | Direct-Fired | 13,333 sq ft | 8,000 sq ft | 5,714 sq ft |
| THC-355CDF (Direct Dual-Fuel) | Tent/Direct-Fired | 11,000 sq ft | 6,600 sq ft | 4,714 sq ft |
| THC-175DF (Direct Dual-Fuel) | Tent/Direct-Fired | 5,833 sq ft | 3,500 sq ft | 2,500 sq ft |
| THC-85P (Direct Propane) | Tent/Direct-Fired | 2,833 sq ft | 1,700 sq ft | 1,214 sq ft |
| FRHR-100 (Radiant NG/LP) | Radiant | 3,000 sq ft | 1,800 sq ft | 1,286 sq ft |
Tents (10′ peak height)
| Model | Type | Max Area @ ΔT 30°F | Max Area @ ΔT 50°F | Max Area @ ΔT 70°F |
|---|---|---|---|---|
| FVNP-400 (Indirect NG/LP) | Indirect-Fired | 5,200 sq ft | 3,120 sq ft | 2,229 sq ft |
| FVO-400 (Indirect Oil/Diesel) | Indirect-Fired | 5,200 sq ft | 3,120 sq ft | 2,229 sq ft |
| F-400T (Direct NG/LP) | Direct-Fired | 5,333 sq ft | 3,200 sq ft | 2,286 sq ft |
| THC-355CDF (Direct Dual-Fuel) | Tent/Direct-Fired | 4,400 sq ft | 2,640 sq ft | 1,886 sq ft |
| THC-175DF (Direct Dual-Fuel) | Tent/Direct-Fired | 2,333 sq ft | 1,400 sq ft | 1,000 sq ft |
| THC-85P (Direct Propane) | Tent/Direct-Fired | 1,133 sq ft | 680 sq ft | 486 sq ft |
| FRHR-100 (Radiant NG/LP) | Radiant | 1,200 sq ft | 720 sq ft | 514 sq ft |
Sizing assumptions (click to expand)
- Enclosed spaces: Rule of thumb ~1 BTU/ft³ yields ~10°F rise. With 10′ ceilings, Area ≈ BTU ÷ ΔT.
- Tents: Field formula BTU/hr ≈ Volume × ΔT × 0.25. With 10′ peak, Area ≈ BTU ÷ (2.5 × ΔT).
- Adjust for different heights: multiply areas by (10 ÷ actual height).
- Account for air changes, insulation, moisture removal, and ventilation codes (especially for direct-fired models).
Next step: size looks right? Browse Flagro models and accessories on FlagroSales.com or contact Climate Control Solutions for a load calc and duct plan.
Need Help Sizing? Get a Quote
We’ll size the right Flagro heater, plan duct runs, and get you turnkey pricing fast.
Get a Quote or call (800) 633-8711
Shop Featured Flagro Heaters (FlagroSales.com)
Use these quick links to browse on FlagroSales.com (swap in your exact product URLs):
- FVO-400 Indirect-Fired (Oil/Diesel) — Shop at FlagroSales.com
- FVNP-400 Indirect-Fired (Propane/Natural Gas) — Shop at FlagroSales.com
- F-400T Dual-Fuel Construction Heater — Shop at FlagroSales.com
- F-1000T / F-1500T High-Capacity Dual-Fuel — Shop at FlagroSales.com
- FRHR-100 Radiant Series — Shop at FlagroSales.com
Why Buy from Climate Control Solutions
- Application expertise: We help size BTUs, CFM, and duct plans for your exact space.
- Fast fulfillment & support: Coordinated delivery, setup guidance, and parts/accessories when you need them.
- One-stop climate control: Heaters, AC, dehumidification, air quality—year-round readiness.
Have a project? Request a quote or call (800) 633-8711.
