Flagro THC-175DF Ductable Direct Fired Heater
Quick Quote Request
Buy Direct & Save
"*" indicates required fields
The Flagro THC-175DF 175,000 BTU Dual-Fuel Direct-Fired Heater delivers temporary heating for construction sites, commercial tents, and properly ventilated temporary structures. Its propane/natural gas compatibility, remote thermostat, and optional ducting make it a versatile commercial heating solution.
Key Specifications:
- Heating Capacity: 175,000 BTU/hr
- Fuel: Propane or Natural Gas
- Airflow: 1,200 CFM
- Electrical: 115V / 15A
- Propane Consumption: 8 lbs/hr
- Natural Gas Consumption: 175 CFH
- Thermostat: Included with 20′ Cord
- Weight: 164 lbs
- Ducting: Optional 12″ × 12′
Included: 15′ fuel hose and two-stage regulator.
Nationwide shipping available. Contact us for pricing and availability.
The Flagro THC-175DF 175,000 BTU Dual-Fuel Direct-Fired Heater provides powerful temporary heating for commercial tents, construction sites, and temporary structures. Designed for dependable performance, this ductable heater combines 175,000 BTU/hr of heating capacity, 1,200 CFM airflow, and propane/natural gas compatibility in a portable, commercial-grade design.
The THC-175DF features thermostatic temperature control, direct spark ignition, and a fuel selector valve that allows operation with propane or natural gas when configured according to the manufacturer’s instructions.
A remote thermostat with a 20-foot cord, 15-foot fuel hose, and two-stage regulator are included with the heater. Optional 12-inch high-temperature ducting allows heated air to be directed into suitable temporary structures and work areas.
Whether you need temporary heat for a construction project, commercial tent, or industrial maintenance operation, the Flagro THC-175DF offers flexible dual-fuel heating in one convenient unit.
Key Features of the Flagro THC-175DF
- 175,000 BTU/hr Heating Capacity: Provides high-output temporary heating for construction and commercial applications.
- Dual-Fuel Operation: Compatible with propane or natural gas.
- 1,200 CFM Airflow: Delivers heated air to suitable work areas and temporary structures.
- Direct-Fired Heating: Uses a gas burner to generate heat directly within the supplied airflow.
- Thermostatic Control: Helps maintain the selected temperature during operation.
- Included Remote Thermostat: Features a 20-foot cord for flexible thermostat placement.
- Fuel Selector Valve: Allows the heater to be configured for either propane or natural gas.
- Direct Spark Ignition: Provides automatic burner ignition.
- 115V Electrical Operation: Uses compatible single-phase electrical service.
- Included Fuel Accessories: Supplied with a 15-foot hose and two-stage regulator.
- Optional High-Temperature Ducting: Compatible with specified 12-inch Flagro duct accessories.
- Fan-Only Mode: Circulates air without operating the burner.
- Portable Construction: Designed for temporary commercial heating.
- cETLus Listed: Manufacturer-listed safety certification.
Dual-Fuel Heating: Propane or Natural Gas
The Flagro THC-175DF offers flexibility for commercial contractors by supporting two fuel types.
Propane Operation
The THC-175DF operates on vapor propane with a heating capacity of 175,000 BTU/hr.
Published propane specifications:
- Heating Capacity: 175,000 BTU/hr
- Fuel Consumption: 8 lbs/hr
- Required Inlet Pressure: 11–14 inches water column
A compatible propane supply must be sized to provide sufficient fuel volume and pressure.
Natural Gas Operation
The heater can also operate on natural gas.
Published natural gas specifications:
- Heating Capacity: 175,000 BTU/hr
- Fuel Consumption: 175 cubic feet per hour
- Required Inlet Pressure: 8.5–14 inches water column
When changing fuel types, operators must use the correct selector-valve position and follow Flagro’s approved instructions.
Important: Incorrect fuel selection or supply pressure can damage equipment and create unsafe operating conditions. Fuel connections and installation must meet the manufacturer’s requirements.
Thermostatically Controlled Temporary Heating
The THC-175DF includes a remote thermostat with a 20-foot cord.
This allows the thermostat to be positioned at an appropriate temperature-monitoring location away from the heater.
When operated in thermostat mode, the heater cycles according to the temperature setting and heating demand.
This feature is useful for maintaining more consistent temperatures in suitable temporary structures and construction work areas.
The heater also provides manual heating and fan-only operating modes.
Common Applications for the Flagro THC-175DF
Commercial Tent Heating
The THC-175DF is marketed by Flagro for commercial tent and temporary-structure heating.
Its dual-fuel compatibility, thermostat, and optional ducting make it useful for appropriately designed installations.
Potential applications include:
- Commercial event tents
- Temporary event structures
- Construction tents
- Seasonal commercial enclosures
- Temporary work shelters
Because the THC-175DF is a direct-fired heater, combustion products enter the heated airflow. Adequate ventilation and applicable fire-safety approvals are essential, particularly where people will occupy the heated space.
Construction Site Heating
Construction projects often require temporary heating during colder temperatures, building renovations, and winter construction operations.
The THC-175DF provides portable heat for suitable, adequately ventilated construction areas.
Applications include:
- Commercial construction projects
- Temporary construction enclosures
- Building renovations
- Winter jobsite heating
- Temporary heating during HVAC installation
- Maintenance and repair projects
Industrial and Commercial Work Areas
Industrial facilities and commercial maintenance operations may require supplemental heating during colder weather.
The THC-175DF can support temporary heating in locations where direct-fired heating is permitted and adequate fresh-air ventilation is available.
Temporary Heating and Air Circulation
The heater includes a fan-only operating mode.
This allows the blower to circulate air without activating the burner, providing additional flexibility when heating is not required.
Explore Commercial Heating Applications
Flagro THC-175DF Technical Specifications
| Specification | Flagro THC-175DF |
|---|---|
| Model | THC-175DF |
| Heater Type | Ductable Direct-Fired Heater |
| Heating Capacity | 175,000 BTU/hr |
| Fuel Type | Propane / Natural Gas |
| Maximum Airflow | 1,200 CFM |
| Electrical Supply | 115V / 60Hz / Single Phase |
| Listed Electrical Requirement | 15 Amps |
| Propane Consumption | 8 lbs/hr |
| Natural Gas Consumption | 175 CFH |
| Propane Inlet Pressure | 11–14″ W.C. |
| Natural Gas Inlet Pressure | 8.5–14″ W.C. |
| Ignition | Direct Spark |
| Thermostat | Included |
| Thermostat Cord | 20 Feet |
| Fuel Hose | 15 Feet, Included |
| Regulator | Two-Stage, Included |
| Fuel Selector Valve | Yes |
| Fan-Only Operation | Yes |
| Optional Duct Diameter | 12 Inches |
| Maximum Approved Duct Length | 12 Feet |
| Length | 35″ |
| Width | 24″ |
| Height | 33″ |
| Net Weight | 164 lbs |
| Shipping Weight | Approximately 193 lbs |
| Certification | cETLus |
Specifications reflect Flagro’s published THC-175DF product information. Consult the current operating manual and equipment nameplate for installation and safety requirements.
Electrical Requirements
The THC-175DF requires 115V / 60Hz single-phase electrical power.
Flagro lists a 15-amp electrical requirement for the heater.
The unit uses a grounded electrical connection and includes a power supply indicator designed to help identify certain electrical problems.
The manufacturer’s operating manual explains that the indicator can identify conditions such as reverse polarity or grounding issues.
Always connect the heater to a properly rated and grounded electrical supply.
Optional Ducting and Accessories
Flagro offers manufacturer-approved ducting accessories for the THC-175DF.
THCP-WD12 — 12-Inch High-Temperature Duct
The THCP-WD12 is the approved duct for the THC-175DF.
- Diameter: 12 inches
- Length: 12 feet
- Application: Heated-air distribution
- Type: Manufacturer-specified high-temperature duct
The manufacturer’s operating manual limits ducting to a maximum of 12 feet. Additional lengths or alternative duct materials should not be used without express manufacturer approval.
THCP-DA12 — Duct Adapter
The THCP-DA12 is a compatible adapter for connecting approved ducting to the heater.
THCP-DD — Duct Diffuser
The THCP-DD is designed for compatible heated-air distribution installations.
THCP-HD175 — Heater Diffuser
The THCP-HD175 is a manufacturer-listed diffuser accessory for the THC-175DF.
Contact Climate Control Solutions for accessory availability and pricing.
Browse Commercial HVAC Accessories
Included Fuel Hose and Regulator
The THC-175DF includes a 15-foot fuel hose and two-stage regulator.
These accessories support installation with a compatible fuel supply.
The fuel supply must provide the appropriate pressure and volume for the selected fuel.
All hose assemblies, regulators, connections, and fuel changes must follow Flagro’s instructions.
Safety and Ventilation Requirements
The Flagro THC-175DF is a direct-fired gas heater.
Unlike an indirect-fired heater, it releases combustion products into the heated airflow.
For this reason, the THC-175DF must not be operated in a closed, confined, or inadequately ventilated space.
Flagro specifies the following minimum clearances from combustible materials:
| Location | Minimum Clearance |
|---|---|
| Above Heater | 5 Feet |
| Front | 2 Feet |
| Sides | 1 Foot |
| Rear | 2 Feet |
Additional requirements include:
- Provide adequate fresh-air ventilation.
- Install the heater on a level surface.
- Use only propane or natural gas.
- Follow the correct fuel-selector procedure.
- Inspect fuel connections for leaks.
- Keep combustible materials away from the heater.
- Use only approved high-temperature ducting.
- Do not obstruct combustion or ventilation airflow.
- Maintain proper separation from propane cylinders.
- Follow all manufacturer instructions and applicable codes.
The heater is intended for approved temporary heating applications, not residential heating.
Why Choose the Flagro THC-175DF?
The Flagro THC-175DF combines 175,000 BTU/hr of heating capacity with dual-fuel operation, thermostatic control, and portable construction.
Its included remote thermostat, fuel hose, regulator, and optional duct accessories provide flexibility for commercial contractors and temporary heating applications.
The ability to switch between propane and natural gas is particularly useful for contractors working at locations with different fuel supply arrangements.
Compare Other Flagro Direct-Fired Heaters
Climate Control Solutions offers additional Flagro heating equipment:
- Flagro THC-85P: 85,000 BTU propane direct-fired heater.
- Flagro THC-175DF: 175,000 BTU dual-fuel direct-fired heater.
- Flagro THC-355CDF: 330,000 BTU dual-fuel direct-fired heater.
Explore Commercial Heating Solutions
Frequently Asked Questions About the Flagro THC-175DF
How much heat does the THC-175DF produce?
The Flagro THC-175DF provides 175,000 BTU/hr of heating capacity.
Is the THC-175DF dual-fuel?
Yes. The heater operates on propane or natural gas when properly configured.
How much propane does the THC-175DF consume?
Flagro lists approximately 8 pounds of propane per hour at rated operation.
How much natural gas does the heater consume?
The manufacturer lists approximately 175 cubic feet of natural gas per hour.
Does the THC-175DF include a thermostat?
Yes. It includes a remote thermostat with a 20-foot cord.
Does it include a fuel hose and regulator?
Yes. Flagro lists a 15-foot hose and two-stage regulator as included equipment.
What electrical power does it require?
The THC-175DF requires 115V / 60Hz single-phase power with a manufacturer-listed 15-amp requirement.
How much airflow does the heater produce?
The unit provides up to 1,200 CFM.
What size ducting is compatible?
Flagro specifies 12-inch THCP-WD12 high-temperature ducting.
How much ducting can be connected?
The operating manual limits the THC-175DF to a maximum of 12 feet of approved ducting.
Can the THC-175DF operate without heating?
Yes. It includes a fan-only mode for air circulation.
Can the THC-175DF be used inside temporary structures?
Only in approved installations with adequate fresh-air ventilation and compliance with the manufacturer’s requirements and applicable safety codes. It must not operate in closed or confined spaces.
Request a Quote for the Flagro THC-175DF
Climate Control Solutions supplies Flagro direct-fired heaters, commercial tent heaters, and temporary heating equipment nationwide.
Whether you need one THC-175DF for a construction project or multiple units for a commercial application, our team can assist with fuel requirements, compatible ducting, equipment selection, and shipping.
Contact Climate Control Solutions for current pricing and availability.
Phone: (800) 633-8711
Email: [email protected]
Trusted by Clients for Exceptional Service
Looking For Multiple Units?
Contact us using the button below and we can help you get accurate pricing for your bulk orders.
Related products
Airrex AHSC-140R 220V: 12-Ton Portable Air Conditoner w/ Electric Heat (R-454B Refrigerant)
Original price was: $37,551.65.$35,672.76Current price is: $35,672.76.
Top-Quality Brands for Superior Climate Control
At Climate Control Solutions, we prioritize quality when it comes to spot coolers, portable heat pumps, and evaporative coolers. That’s why we collaborate with some of the industry’s most respected brands to offer you the finest products. Our selection features renowned names like Airrex USA, Big Ass Fans, Cajun Kool, Cool Boss, Flagro, and Master—brands celebrated for their excellence, innovation, and durability.
