TD425 Flameless Heater

TD425 Flameless Heater

425,000 BTU'S
3,200+ CFM
3.00" Static Pressure

No Flames. No Fumes. No Fuss. Just Heat!

Ideal for applications where an 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

View TD425 Flameless Heater PDF Brochure


      • 18 years of proven performance in the harshest conditions
    • SIMPLE
      • Few moving parts and intelligently designed
      • Huge, real fuel savings versus indirect fired flamed heaters. (40%)
    • SAFE
      • 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 Available: 425,000
    •  CFM: 3,200+
    • Static Pressure: 3.00” LBS
    • Temperature: 180°F
    •  Max Fuel Consumption: 3.1GPH
    • Caterpillar C2.2 Tier IVF
    • Weight, Empty: Approx. 2,525 lbs
    • Weight, Full: Approx. 3,100 lbs
    • Overall Height: 12’4″
    • Overall Width: 5’6”
    • Overall Length: 6’0”
    • 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.

Copyright © 2023 Frend Therm Inc.. All Rights Reserved.
757 Henry Road, Box 150, Petersfield, Manitoba Canada R0C 2L0