Frost Fighter DF400-II 400000 Btu Direct Fired heaters NG LP
The Frost Fighter DF400-II is a powerful 400,000 BTU direct-fired heater engineered for fast, reliable heat in demanding commercial and industrial environments. Designed to run on either natural gas or propane (NG/LP), it delivers high-volume, efficient heat output for construction sites, warehouses, event spaces, agricultural buildings, and temporary heating applications where consistent performance matters most.
Features
• 400,000 BTU high-output direct-fired heating capacity
• Dual-fuel capability for natural gas or propane operation
• Heavy-duty steel construction for jobsite durability
• High-efficiency burner system for maximum heat transfer
• Integrated safety controls with flame monitoring and overheat protection
• High-velocity airflow for rapid, even heat distribution
• Compact, portable design with forklift and lifting points
• Simple control interface for fast startup and operation
Benefits
• Quickly heats large spaces to maintain productivity in cold conditions
• Flexible fuel options reduce downtime and improve jobsite convenience
• Rugged construction ensures long service life in harsh environments
• Efficient combustion lowers fuel waste and operating costs
• Built-in safety systems protect workers and equipment
• Powerful airflow delivers uniform heating without cold spots
• Portable design allows easy relocation between job locations
• User-friendly controls minimize setup time and training requirements
Specifications
Features:
Lowest Emissions in the Industry
ETL 2009 International Approved
Powder Coated
Thermostatically Controlled
Low Pressure Regulator on Manifold
Standard Wheels for easy mobility
Easy Ball Valve Changeover from Propane to Natural Gas
Stainless Steel Burner for Higher Efficiency & Durability
Certified to ANSI Z83.7 / CSA 2.14
BTU-Output: DF400: 400,000 BTU DF1500: 800,000 and 1,500,000 BTU • Airflow: DF400 - 2500CFM - 1/2 HP Motor DF1500 - 7700CFM - 1 HP Motor • Gas connection: DF400: 3/4” NPT DF1500: 1 ¼” NPT
Electrical connection: DF400: 120V 15A DF1500: 120V 15A- new! • Dual-Fuel: Yes, Propane or Natural gas. Hand-valve switchable.
Double-wall Construction: Yes, reduces surface temperature
Thermostatic Control: Yes.
Electronic Flame Supervision: Yes.
Venting: No external venting required.
LEED Construction: Yes.
OSHA compliant: Yes, CO below 50PPM (PEL).
Unattended use allowed: Yes.
Proof of Airflow: Yes, burner shuts-down upon restricted airflow.
High Temperature Limit: Yes.
Motor overload protection: Yes, Automatic reset.
Dual gas regulators: Yes, regulators control gas pressure & prevent any overpressure to burner.
Dual gas valves: Yes, ensures complete gas shut-off to burner.
Manual gas shut-off valve: Yes.
Data plate and Safety Markings: Yes.
Thermostatic control: Yes, single stage (400) or 2 stage (1500).
Stacking Frame: Yes (1500).
Read Operators Manual before operating. Follow all national and local codes for proper installation & operation.
