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Ideal for applications where a open flame or spark-risk is out of the question; the TD425 excels at providing clean dry heat.

The patented technology uses a diesel powered engine to agitate hydraulic oil in a flameless, sparkless, low-pressure environment. The oil is heated and circulated, not burned, providing a clean pollution free discharge to the target environment. Safety features are incorporated to protect the investment of your Therm Dynamics heater. For example, an overspeed air intake shut-off valve is standard equipment.

All heaters are equipped with a set of four shut-off switches that terminate the engine when excessive oil pressures, water, or oil temperatures are detected.

Certified to UL733-2013 & CSA B 140.8.1967(R2015) STANDARDS REPORT NUMBER: 0489HH001S



18 years of proven performance in the harshest conditions


Few moving parts and intelligently designed


Huge, real fuel savings versus indirect fired flame heaters. (40%)


Flameless heat is captured from the diesel engine and a patented low pressure hydraulic fluid heat plate


Therm Dynamics heaters are certified to CSA/UL standards


Expectations are for over 12,000 hours of dependable service

Remote Site Thermostat Control
Duct Storage
1 – 16″ Outlet
Torsion Axle


Fuel: Diesel #2
Max BTU Output: 425,000
CFM: 3,200+
Static Pressure: 3.00” LBS
Temperature: 180°F
Max Fuel Consumption: 3.1 GPH
1 – 16″
Power plant
Caterpillar C2.2 Tier IVF
Weight, Empty: Approx. 2,525 lbs
Weight, Full: Approx. 3,100 lbs
Height: 12’4″
Width: 5’6”
Length: 6’0”
Fuel Capacity: 84 Gals


Our versatile, portable heaters can be used in hundreds of applications including thawing frozen ground, heating buildings or structures, curing concrete, drywall/paint drying and removing excess moisture to inhibit mold growth and any other application that requires clean, dry, flameless heat.


Easy access to all maintenance components and minimal operation supervision
Low humidity, high CFM for drying. Reduces relative humidity
Clean, uncontaminated air output improves working environment. No carbon monoxide poisoning risk
Thermostat controlled operation will improve fuel efficiency
Halliburton, Conoco, Exxon, Shell, BP and Anadarko currently utilize our heaters in their fleet
Safe, flameless heat. Eliminates all risk of fires
Proudly made in Tea, SD USA


Available options include custom paint, ducting, ducting storage, recirculation inlets, operational strobe light, emergency shut-down button and many more.