Flameless Heater (ES-FLS)


The ES-FLS Flameless Heater by ESI safely and efficiently converts all available energy from diesel fuel into 690,000 BTUs of clean, dry heat without any combustion source in the airstream.

The flameless heater is capable of heating any jobsite effectively with minimal interruptions. Running at maximum output, it produces a 195-degree temperature rise, at an airflow of 3200 CFM, for at least 30 continuous hours between refuels. And it’s designed for long run service intervals to minimize downtime for maintenance.

Flame and ignition related hazards are eliminated by utilizing a heat generator unit, rather than a burner, as the primary heat source. While the Kubota engine is driving the heat generator, its thermal energy is captured at the radiator and exhaust then recycled through heat exchangers to further raise the temperature of the airflow.

Like all ESI heaters, the ES-FLS is engineered to operate reliably in the severest winter conditions. It continues to run long after others have quit due to our innovative cabinet design which keeps the engine warm enough to run at optimal performance levels.

It’s also Built Arctic Tough to be exceptionally durable and weather resistant using quality industrial components by top manufacturers including Parker, Siemens, Stauff, and Spal.

For the ultimate in flameless performance, ease of operation, and quality craftsmanship, look no further than the ES-FLS Flameless Heater by ESI.

Features & benefits

  • 690,000 BTU/HR heat output
  • 3200 CFM variable airflow
  • 195-degree temperature rise
  • 30-hour run time at max output for optimal heat with less downtime
  • Powerful and efficient Kubota diesel engine
  • Two 12-inch outlet ports and one 20-inch inlet port
  • Built-in quick release toggle clamp on all ports to facilitate easy duct attachment
  • Murphy controller for simple operation and control
  • Easy three-level adjustment of system output
  • Max Volume operation mode for applications requiring maximized airflow over higher temperatures
  • Three-color beacon indicator light for at-a-glance monitoring of engine, heater, and fuel status
  • Emergency shutdown switch
  • Interior and control panel lights
  • Integrated fork pockets and lifting bail

Quality construction

  • Environmentally responsible construction that features 150% secondary fluid containment
  • Exceptionally durable and weather resistant
  • Powder-coated finishes throughout
  • High quality industrial materials
  • Proven reliable mechanical components by top manufacturers

Easy service by design

  • Long run service interval
  • Large cabinet access doors make servicing oil, air, and fuel filters easy
  • “Service life remaining” controller display lists serviceable components and service life remaining in hours

Available mounting

  • Trailer-mounted on 8,000 lb. axle


  • Positive air shutdown
  • Single 16-inch or 20-inch outlet ports


Max heat output 690,000 BTU/hr
Temperature rise 195°
Fan capacity 3200 CFM
Static pressure 5 in
Heat settings High, medium, low
Duct outlet ports 2 x 12 in
1 x 16 in (optional)
1 x 20 in (optional)
Duct inlet port 1 x 20 in
Make Kubota
Model V3800-T
Type Diesel, 4-cylinder, turbocharged
Operating speed 2300 rpm
Max engine power 99 hp
Capacity 145 gal [549 L]
Max burn rate 5.8 gph
Secondary containment 150%
Size L x W x H 8′ x 15′ x 8.9′
Dry weight 7100 lb [3221 kg]


Heater ducting

  • Jetflex by Engineered Performance Ducting
  • ES700 outlet: 2 x 12″ or 1 x 16″ diameter
  • ES700 inlet: 1 x 20″ diameter
  • Available in 25 foot length

More info…

Product Support Page

Model #







Construction, Oil & Gas

Available for Rent in ALASKA


Available for Rent in North Dakota


Available for Sale in Alaska


Available for Sale in North Dakota


Highlight Specs

Max BTU Output: 690,000 BTU/hr
Max Air Flow: 3,200 CFM
Fuel Tank Size: 145 Gal
Fuel Type: Diesel
Max Fuel Consumption: 5.8 GPH
Run Time: 25 hrs +
Oil Service Interval: 800 hrs
Generator: N/A


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