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Ideal for applications where an open flame or spark-risk is out of the question; the TD625 excels at providing 625,000 BTUs of clean, dry heat.

The patented technology uses a diesel power engine to agitate hydraulic oil in flameless, sparkless, low-pressure environment. In addition, an overspeed air intake shutoff valve is standard equipment. 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.

All heaters are equipped with a set of four shut-off switches that terminate the engine when excessive pressures, speed or water 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 flamed 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



  • Fuel: Diesel #2
  • Max BTU Output: 625,000
  • CFM: 4,500+
  • Static Pressure: 3.5” lbs.
  • Temperature: 180 ° F
  • Max Fuel Consumption: 4.9 GPH


  • CAT C3.4 T4F


  • Weight, empty: Approximately 4,420 lbs.
  • Cabinet height: 6’6”
  • Overall length: 12’4”
  • Overall width: 5’6”


  • Fuel Capacity: 100 Gallons. 200 Gallons optional


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.